Page 1 DGS-3308 Series 8-Port Gigabit Layer 3 Switch User’s Guide First Edition (October 2004) 651FG3308015 Printed In Taiwan RECYCLABLE...
Page 2: Wichtige Sicherheitshinweise
Wichtige Sicherheitshinweise Bitte lesen Sie sich diese Hinweise sorgfältig durch. Heben Sie diese Anleitung für den spätern Gebrauch auf. Vor jedem Reinigen ist das Gerät vom Stromnetz zu trennen. Vervenden Sie keine Flüssig- oder Aerosolreiniger. Am besten dient ein angefeuchtetes Tuch zur Reinigung.
Page 3: Limitation Of Liability
D-Link warrants each of its hardware products to be free from defects in workmanship and materials under normal use and service for a period commencing on the date of purchase from D-Link or its Authorized Reseller and extending for the length of time stipulated by the Authorized Reseller or D-Link Branch Office nearest to the place of purchase.
Page 4 D-Link makes no warranty that operation of its software products will be uninterrupted or absolutely error-free, and no warranty that all defects in the software product, within or without the scope of D-Link's...
Page 5: Copyright Statement
D-Link Offices for Warranty Service To obtain an RMA number for warranty service as to a hardware product, or to obtain warranty service as to a software product, contact the D-Link office nearest you. An address/telepho ne/fax/e-mail/Web site list of D-Link offices is provided in the back of this manual Trademarks Copyright 2001 D-Link Corporation.
Page 6: Fcc Warning
FCC Warning This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
Page 7: Table Of Contents
About This Guide...1 Overview of this User’s Guide ...1 Introduction...2 Layer 3 Switching...2 The Functions of a Layer 3 Switch...3 Features ...3 Ports...3 Performance Features...4 Layer 2 Switching Features...4 Layer 3 Switching Features...4 Traffic Classification and Prioritization...5 Management ...5 Optional Redundant Power Supply...6 Fast Ethernet Technology...6...
Page 8 Layer 2 Switch Settings ...75 Layer 3 Switch Mode - Setup RIP ...76 Advanced Setup...78 Configuring VLANs...78 VLANs by Switch Operating Mode – Layer 2 Only and IP Routing...78 Setting Up IP Interfaces ...85 Multicasting...88 Layer 2 Multicast Setup ...88 IGMP Snooping Settings –...
Page 9 Layer 2 Switch Utilities... 116 Upgrade Firmware from TFTP Server... 116 Download Configuration File from TFTP Server... 117 Upload Configuration File to TFTP Server... 118 Save Log to TFTP Server... 119 Ping ... 120 Layer 3 Utilities... 120 BOOTP/DHCP Relay... 120 DNS Relay...
Page 10 Remote Management Setup... 185 Management Station IP Settings ... 185 SNMP Community Settings ... 186 Setup Trap Receivers ... 187 Setup User Accounts... 187 Serial Port Settings... 189 Network Monitoring ... 190 Statistics ... 190 Address Table... 194 Applications ... 198 Maintenance...
Page 11: About This Guide
Chapter 7, “Web-Based Network Management.” Tells how to manage the Switch through an Internet browser. Appendix A, “Technical Specifications.” Lists the technical specifications of the DGS-3308TG and DGS-3308FG. Appendix B, “RJ-45 Pin Specifications.” Shows the details and pin assignments for the RJ-45 receptacle/connector.
Page 12: Introduction
Layer 2 switches, and indeed the entire subnetting scheme, would remain in place. The DGS-3308FG can also replace key traditional routers for data centers and server farms, routing between these locations and the rest of the network, and providing eight ports of Layer 2 switching performance combined with wire-speed routing.
Page 13: The Functions Of A Layer 3 Switch
Updates forwarding statistics in the Management Information Base Applies security controls A Layer 3 switch can be placed anywhere within a network core or backbone, easily and cost-effectively replacing the traditional collapsed backbone router. The DGS-3308 Layer 3 switch communicates with a WAN router using a standard Gigabit Ethernet or GBIC-based port.
Page 14: Performance Features
Per device packet buffer: 512Kbytes. RS-232 DCE Diagnostic port (console port) for setting up and managing the Switch via a connection to a console terminal or PC using a terminal emulation program. Performance Features Layer 2 Switching Features 16 Gbps switching fabric capacity Wire speed packet forwarding rate per system.
Page 15: Traffic Classification And Prioritization
8-port Gigabit Ethernet Switch User’s Guide Supports IP packet de-fragmentation. Supports Path MTU discovery. Supports 802.1D frame support. Traffic Classification and Prioritization Based on 802.1p priority bits. Based on MAC address. 4 priority queues. Management RS-232 console port for out-of-band network management and system diagnosis via a console terminal or PC.
Page 16: Optional Redundant Power Supply
The DGS-3308 supports the optional DPS-1000 (Redundant Power Supply) to provide automatic power supply monitoring and switchover to a redundant power supply (located in the chassis of the DPS-1000) in case of a failure in the Switch’s internal power supply.
Page 17: Unpacking And Setup
One AC power cord One Installation Guide This User’s Guide on CD-ROM If any item is found missing or damaged, please contact your local D-Link reseller for replacement. Installation Use the following guidelines when choosing a place to install the Switch: The surface must support at least 3 kg.
Page 18: Rack Installation
The DGS-3308 can be mounted in an EIA standard-sized, 19-inch rack, which can be placed in a wiring closet with other equipment. To install, attach the mounting brackets on the Switch’s side panels (one on each side) and secure them with the screws provided.
Page 19: Power On
Power on The DGS-3308 can be used with AC power supply 100 - 240 VAC, 50 - 60 Hz. The Switch’s power supply will adjust to the local power source automatically and may be powered on without having any or all LAN segment cables connected.
Page 20: Identifying External Components
Comprehensive LED indicators display the status of the Switch and the network (see the LED Indicators section below). An RS-232 DCE console port for setting up and managing the switch via a connection to a console terminal or PC using a terminal emulation program.
Page 21: Side Panels
100 ~ 240 VAC at 50 ~ 60 Hz. Side Panels The right side panel of the Switch contains two system fans (see the top part of the diagram below). The left side panel contains heat vents.
Page 22: Connecting The Switch
This chapter describes how to connect the DGS-3308FG/DGS-3308TG to your Gigabit Ethernet network. PC to Switch A PC can be connected to the Switch via a four-pair Category 5 cable or a fiber optic cable. The PC should be connected to any of the eight ports of the DGS-3308FG/DGS-3308TG.
Page 23 8-port Gigabit Ethernet Switch User’s Guide Figure 4-2. Switch to switch connection...
Page 24: Switch Management And Operating Concepts
ONCEPTS This chapter discusses many of the concepts and features used to manage the switch, as well as the concepts necessary for the user to understand the functioning of the Switch. Further, this chapter explains many important points regarding these features.
Page 25: Ip Addresses And Snmp Community Names
Switch IP Address to meet the specification of your networking address scheme. The Switch is also assigned a unique MAC address by the factory. This MAC address cannot be changed, and can be found from the initial boot console screen – shown below.
Page 26: Traps
For security, you can set in the Switch a list of IP Addresses of the network managers that you allow to manage the Switch. You can also change the default SNMP Community Strings in the Switch and set the access rights of these Community Strings.
Page 27: Mibs
The trap is not sent if a new root trap is sent for the same transition. New Root (STP) – A New Root trap is sent be the switch whenever a new root port is elected within an STP group.
Page 28: Packet Forwarding
Example: if Port 1 receives a packet destined for a station on Port 2, the Switch transmits that packet through Port 2 only, and transmits nothing through the other ports.
Page 29: Ip Addressing And Subnetting
IP address filtering – the manual entry of specific IP addresses to be filtered from the network (switch must be in IP Routing mode). Packets sent from one manually entered IP address to another can be filtered from the network.
Page 30: Address Classes
10.42.73.210. When the node part is set to all “1”s, the address specifies a broadcast address. So, 10.255.255.255 is the broadcast address for the network 10.0.0.0. 0.0.0.0 255.255.255.255 Table 5-1. Binary to Decimal Conversion 8-port Gigabit Ethernet Switch User’s Guide power (any number raised to the 0...
Page 31: Subnet Masking
8-port Gigabit Ethernet Switch User’s Guide Subnet Masking A subnet mask can be applied to an IP address to identify the network and the node parts of the address. A bitwise logical AND operation between the IP address and the subnet mask results in the Network Address.
Page 32 255.255.240.0 255.255.248.0 255.255.252.0 255.255.254.0 255.255.255.0 255.255.255.12 255.255.255.19 1022 255.255.255.22 2046 255.255.255.24 4094 255.255.255.24 8190 255.255.255.25 16382 8-port Gigabit Ethernet Switch User’s Guide # of Hosts Total Hosts 4194302 8388604 2097150 12582900 1048574 14680036 524286 15728580 262142 16252804 131070 16514820 65534...
Page 33: 802.1Q Vlans
802.1 tag from packet headers to maintain compatibility with devices that are tag- unaware. 3. The Switch’s default - in both Layer 2 Only mode and IP Routing mode - is to assign all ports to a single 802.1Q VLAN named DEFAULT_VLAN. As new VLANs are created, the member ports assigned to the new VLAN will be removed from the DEFAULT_ VLAN port member list.
Page 34: Q Vlan Packet Forwarding
Ingress port – A port on a switch where packets are flowing into the switch and VLAN decisions must be made. Egress port – A port on a switch where packets are flowing out of the switch, either to another switch or to an end station, and tagging decisions must be made.
Page 35: Q Vlan Tags
8-port Gigabit Ethernet Switch User’s Guide Figure 5-3. IEEE 802.1Q Packet Forwarding 802.1Q VLAN Tags The figure below shows the 802.1Q VLAN tag. There are four additional octets inserted after the source MAC address. Their presence is indicated by a value of 0x8100 in the EtherType field. When a packet’s EtherType field is equal to 0x8100, the packet carries the IEEE 802.1Q/802.1p tag.
Page 36: Port Vlan Id
Because of the existence of the PVID for untagged packets and the VID for tagged packets, tag-aware and tag-unaware network devices can coexist on the same network. A switch port can have only one PVID, but can have as many VIDs as the switch has memory in its VLAN table to store them.
Page 37: Ingress Filtering
If the packet is tagged with VLAN information, the ingress port will first determine if the ingress port itself is a member of the tagged VLAN. If it is not, the packet will be dropped. If the ingress port is a member of the 802.1Q VLAN, the switch then determines if the destination port is a member of the 802.1Q VLAN.
Page 38: Spanning Tree Protocol
The DGS-3308 STP allows two levels of spanning trees to be configured. The first level constructs a spanning tree on the links between switches. This is referred to as the Switch or Global level. The second level is on a port group basis.
Page 39: Stp Operation Levels
STP Operation Levels The Switch allows for two levels of operation: the switch level and the port level. The switch level forms a spanning tree consisting of links between one or more switches. The port level constructs a spanning tree consisting of groups of one or more ports.
Page 40: Bridge Protocol Data Units
STP communicates between switches on the network using Bridge Protocol Data Units (BPDUs). Each BPDU contains the following information: The unique identifier of the switch that the transmitting switch currently believes is the root switch switch – lower numbers give...
Page 41: Creating A Stable Stp Topology
A designated switch is selected. This is the switch closest to the root switch through which packets will be forwarded to the root. A port for each switch is selected. This is the port providing the best path from the switch to the root switch. Ports included in the STP are selected.
Page 42 From disabled to blocking You can modify each port state by using management software. When you enable STP, every port on every switch in the network goes through the blocking state and then transitions through the states of listening and learning at power up. If properly configured, each port stabilizes to the forwarding or blocking state.
Page 43: Illustration Of Stp
STP assistance is not applied. If switch A broadcasts a packet to switch B, switch B will broadcast it to switch C, and switch C will broadcast it to back to switch A ... and so on. The broadcast packet will be passed indefinitely in a loop, potentially causing a network failure.
Page 44: Internet Protocols
Figure 5-8. After Applying the STA Rules The switch with the lowest Bridge ID (switch C) was elected the root bridge, and the ports were selected to give a high port cost between switches B and C. The two (optional) Gigabit ports (default port cost = 4) on switch A are connected to one (optional) Gigabit port on both switch B and C.
Page 45: Protocol Layering
8-port Gigabit Ethernet Switch User’s Guide Protocol Layering The task of connecting users to networks, and then networks to networks, is made somewhat easier by dividing up the overall job into simpler, but related, tasks. Each task is structured to be resilient to failures in the connecting hardware, software, data loss, data corruption, and data received out of order.
Page 46 8-port Gigabit Ethernet Switch User’s Guide Using the protocol layering model to visualize the organization of the network software, Layer 2 represents switching and Layer 3 represents routing. In fact, the protocol layering model gives only guidelines for writing programs to accomplish certain tasks and functions.
Page 47 MAC address and the port number of end stations and enter the information into a lookup table. In this way, a switch ‘learns’ the location of end stations and other switches attached to its ports. Switching is usually limited to the Local Area Network (LAN) and requires a routing function to connect to the Internet or to a Wide Area Network (WAN).
Page 48 8-port Gigabit Ethernet Switch User’s Guide TCP/IP Transmission Control Protocol/Internet Protocol (TCP/IP) is the official name of a suite of protocols designed to allow computers to communicate and share resources across a network. TCP and IP are only the two best known protocols of the suite, but TCP/IP is used to refer to the entire suite.
Page 49: Udp And Icmp
8-port Gigabit Ethernet Switch User’s Guide Connection 1 Connection 2 So the local computer, 10.42.73.23 has two connections to the FTP Server, 210.128.12.1. Commands sent from 10.42.73.23 are received by the FTP Server on the well-known TCP port number 21, but the transmitted files are received by 10.42.73.23 on either TCP port number 1234 or 1235, depending on which port issued the command.
Page 50 8-port Gigabit Ethernet Switch User’s Guide The TCP header is added to the beginning of each packet. This header contains at least 20 octets including the source and destination TCP port numbers. Each packet is given a sequence number that is used to ensure that the packets are received in the correct order. The packets themselves are not numbered, instead, the octets the packet contains is numbered.
Page 51 8-port Gigabit Ethernet Switch User’s Guide Figure 5-12. IP Packet Header Flags and Fragment Offset are used when a packet must be divided into smaller pieces by a network device. This is sometimes necessary for a packet to cross a network that can not process large packet sizes.
Page 52: The Domain Name System
8-port Gigabit Ethernet Switch User’s Guide IP removes the IP header. It looks at the IP protocol field. Since the protocol type is TCP, it passes the packet to TCP. TCP now looks at the sequence number and uses it to recombine the packets in the correct order.
Page 53: Arp
8-port Gigabit Ethernet Switch User’s Guide The software in a traditional router (or the hardware in a layer 3 switch) is designed to forward packets from one network to another. Routing is based upon the Network Address of the destination IP address. Each network device or computer has at least one gateway address (the default gateway) and this is generally the best way to send packets out of the local network and into the WAN or the Internet.
Page 54 ST Routers ST Hosts All RIP2 Routers All IGRP Routers Mobile Agents DHCP Servers and Relay Agents All PIM Routers RSVP Encapsulation All CBT Routers Designated Sbm All Sbms VRRP Unassigned through DVMRP on MOSPF 8-port Gigabit Ethernet Switch User’s Guide...
Page 55: Internet Group Management Protocol (Igmp)
8-port Gigabit Ethernet Switch User’s Guide Internet Group Management Protocol (IGMP) Computers and network devices that want to receive multicast transmissions need to inform nearby routers that they will become members of a multicast group. The Internet Group Management Protocol (IGMP) is used to communicate this information.
Page 56: Multicast Routing Algorithms
8-port Gigabit Ethernet Switch User’s Guide The states a computer will go through to join or to leave a multicast group are shown below: Figure 5-16. IGMP State Transitions Multicast Routing Algorithms Multicast routing is based on a tree concept where the multicast source is the trunk and the multicast group members are the leaves.
Page 57 8-port Gigabit Ethernet Switch User’s Guide Reverse Path Broadcasting (RPB) The RPB algorithm is a modification of the spanning tree algorithm. Instead of building a network-wide spanning tree, a virtual spanning tree is constructed for each multicast source. When a router receives a multicast packet from a source, the router will check to see if the link on which the packet was received is the shortest path to the source.
Page 58: Multicast Routing Protocols
8-port Gigabit Ethernet Switch User’s Guide Multicast Routing Protocols This section gives a brief review of two multicast routing protocols – the Distance Vector Multicast Routing Protocol (DVMRP) and the Protocol Independent Multicast – Dense Mode (PIM-DM). Distance Vector Multicast Routing Protocol (DVMRP) DVMRP was derived from the Routing Information Protocol (RIP).
Page 59 8-port Gigabit Ethernet Switch User’s Guide RIP specifies a few rules to improve performance and reliability. Once a router learns a route from another router, it must apply hysteresis, meaning that it does not replace the route with an equal cost route. In other words, to prevent oscillation among equal cost paths, RIP specifies that existing routes should be retained until a new route has a strictly lower cost.
Page 60: Rip Version 1 Message Format
Meaning Request for partial or full routing information Response containing network-distance pairs from sender’s routing table Turn on trace mode (obsolete) Turn off trace mode (obsolete) Reserved for Sun Microsystem’s internal use Update Request 8-port Gigabit Ethernet Switch User’s Guide...
Page 61: Rip Version 2 Extensions
8-port Gigabit Ethernet Switch User’s Guide A router or host can ask another router for routing information by sending a request command. Routers reply to requests using the response command. In most cases, however, routers broadcast unsolicited response messages periodically. The field VERSION contains the protocol version number (1 in this case), and is used by the receiver to verify it will interpret the message correctly.
Page 62: Rip2 Message Format
8-port Gigabit Ethernet Switch User’s Guide RIP2 Message Format The message format used with RIP2 is an extension of the RIP1 format, with additional information occupying unused octets of the address field. In particular, each address includes an explicit next hop as well as an explicit subnet mask.
Page 63 8-port Gigabit Ethernet Switch User’s Guide Consider, for example, a typical corporate intranet. Most use a hierarchy that consists of a high-speed backbone network with multiple routers each connecting the backbone to a workgroup, where each workgroup occupies a single LAN. Although the corporation can include dozens of workgroups, the span of the entire intranet is only 2.
Page 64: Configuring The Switch Using The Console Interface
Notes are added where clarification is necessary. Where there is a difference in the setup of the switch between its two operational modes ( L ayer 2 Only and IP Routing), the sections are divided to correspond with the Switch operating mode that is applicable.
Page 65: Vlan Layout
The DGS-3308 allows the assignment of IP subnets to individual VLANs. Any VLAN configured on the switch that is not assigned an IP subnet, will behave as a layer 2 VLAN and will not be capable of IP routing – even if the switch is in IP Routing mode.
Page 66: Connecting To The Switch
No flow control You can also access the same functions over a Telnet interface. Once you have set an IP address for your Switch, you can use a Telnet program (in VT-100 compatible terminal mode) to access and control the Switch. All of the screens are identical, whether accessed from the console port or from a Telnet interface.
Page 67 Note: There is no initial username or password. Leave the username and password fields blank. Note: The Switch’s operational mode (Layer 3 or Layer 2) is displayed in the upper right-hand corner of every menu in the console. The switch operational mode is changed under Switch Settings from the Main Menu and is described later in this manual.
Page 68: Setup User Accounts
Figure 6-2. Main Menu Note: The first user automatically gets Root privileges (See Table 6-1). It is recommended to create at least one Root-level user for the Switch. Setup User Accounts To create a new user account, highlight Setup User Accounts from the Main Menu and press Enter:...
Page 69: User Accounts Management
5. A listing of all user accounts and access levels is shown below the user setup menu. This list is updated when APPLY is executed. 6. Please remember that APPLY makes changes to the switch configuration for the current session only. All changes (including User additions or updates) must be entered into non-volatile ram using the Save Changes command on the Main Menu - if you want these changes to be permanent.
Page 70: Save Changes
After establishing a User Account with Root-level privileges, press Esc. Then highlight Save Changes and press Enter (see below). The Switch will save any changes to its non-volatile ram and reboot. You can logon again and are now ready to continue configuring the Switch.
Page 71 8-port Gigabit Ethernet Switch User’s Guide Figure 6-5. Main Menu Figure 6-6. Save Changes screen Once the Switch configuration settings have been saved to NV-RAM, they become the default settings for the switch. These settings will be used every time the Switch is rebooted.
Page 72: Reboot
Main Menu or to execute a factory reset from the System Reboot menu (click Reboot on the Main Menu). This will clear all settings and restore them to their initial values listed in the Appendix. These are the configuration settings entered at the factory and are the same settings present when the Switch was purchased. Figure 6-7. Reboot menu...
Page 73: Logging Onto The Switch Console
User Accounts (and other configuration settings) you may have entered will be erased and the Switch will return to the state it was in when it was purchased. Logging Onto The Switch Console To log in once you have created a registered user, from the login screen: 1.
Page 74: Viewing Current User Accounts
7. You must enter the configuration changes into the non-volatile ram (NV-RAM) using Save Changes from the Main Menu if you want the configuration to be used after a switch reboot. Only a user with Root privileges can make changes to user accounts.
Page 75: Deleting A User Account
4. You must enter the configuration changes into the non-volatile RAM (NV-RAM) using Save Changes from the Main Menu if you want the configuration to be used after a switch reboot. Only users with Root privileges can delete user accounts.
Page 76: Switch Information
Figure 6-11. Switch Information screen The Switch Information shows the type of switch (Layer 3), which (if any) external modules are installed, and the Switch’s MAC Address (assigned by the factory and unchangeable). In addition, the Boot PROM and Firmware Version numbers are shown.
Page 77: Ip Setup
SNMP v1 or to be able to access the Switch using the Telnet protocol or the Web-based Manager. Please see the next chapter for Web-based network management information. The IP Setup menu lets you specify how the Switch will be assigned an IP address to allow it to be identified on the network.
Page 78 New Switch IP Settings heading are those that will be used after the Switch has been Rebooted. In Layer 2 mode, toggle the Get IP From: < This selects how the Switch will be assigned an IP address on the next reboot (or startup). If the Switch is in Layer 3 mode, Manual is automatically assigned.
Page 79: Remote Management Setup
This is usually the address of a router or a host acting as an IP gateway. If your network is not part of an intranet, or you do not want the Switch to be accessible outside your local network, you can leave this field unchanged.
Page 80: Configure Ports
8-port Gigabit Ethernet Switch User’s Guide Setup Trap Recipients Figure 6-15. Setup Trap Recipients screen Configure Ports Highlight Configure Ports from the Main Menu and press Enter:...
Page 81: Serial Port Settings
The following fields can then be set: Baud Rate – Sets the serial bit rate that will be used to communicate the next time the Switch is restarted. Applies only when the serial port is being used for out-of-band (SLIP) management; it does not apply when the port is used for the console port.
Page 82: Switch Operation Mode
IP Routing configuration will become active when the Switch is again put in IP Routing mode. Note: Putting the Switch in IP Routing mode does not – by itself – enable I P routing. The Switch must be configured to use IP interfaces before it is capable of IP routing. (See the section titled Setting up IP Interfaces below.)
Page 83 > can be toggled using the space bar to one of the two switch operation modes: Layer 2 Only, Support IEEE 802.1Q VLANs and IP Routing, Support IEEE 802.1Q VLANs. To make a change in the operation mode of the Switch effective, highlight APPLY and press Enter. Figure 6-20. Change Mode Confirmation screen...
Page 84 8-port Gigabit Ethernet Switch User’s Guide Type y and press Enter. The Switch will then save the changes made during the current session and reboot. The Switch must be rebooted to change the operation mode. Switch Settings – IP Routing Mode Once the Switch is configured for IP Routing (Layer 3 Switching), and rebooted, the Main Menu adds some functions compared to the Layer 2 Only mode.
Page 85: Layer 2 Switch Settings
Note: Layer 2 Switch functions and settings are also available when the Switch is configured to operate in the IP Routing (Layer 3) mode. To access the Layer 2 Switch Settings menu, highlight Layer 2 Switch Settings on the Switch Settings menu and press Enter:...
Page 86: Layer 3 Switch Mode - Setup Rip
[ 255]Kpps – This is the number of thousands Broadcast/Multicast packets per second Upper Threshold: received by the Switch – on one of the base ports – that will trigger the Switch’s reaction to a Broadcast/Multicast storm. Broadcast Storm Mode:<Disabled> – This field can be toggled between Enabled and Disabled using the space bar.
Page 87 8-port Gigabit Ethernet Switch User’s Guide Figure 6-24. Setup Layer 3 – IP Networking menu Now highlight Setup RIP Configuration from the Setup Layer 3 IP Networking menu above and press Enter to access the following screen: Figure 6-25. Setup RIP Configuration screen...
Page 88: Advanced Setup
This section of the manual is therefore divided into two sections for each Advanced Setup menu item to reflect the two switch operation modes – Layer 2 with IEEE 802.1Q VLAN support and IP Routing with IEEE 802.1Q VLAN support. Where there is no difference in the setup between the two switch operation modes, only one section will be presented.
Page 89 8-port Gigabit Ethernet Switch User’s Guide Figure 6-26. VLAN Menu To create an 802.1Q VLAN, highlight Edit 802.1Q VLANs and press Enter: Figure 6-27. Edit 802.1Q VLANs menu To create an 802.1Q VLAN, toggle the Action: <Add/Modify> field to Add/Modify using the space bar. Enter a VLAN ID number in the VID:[ ] field and a name for the new VLAN in the VLAN Name:[ ] field.
Page 90 In the following example screen, the VLAN “Accounting” - VID# 2 – has been added. Ports 7 and 8 are Egress ports (static members of “Accounting”). Ports 5 and 6 are Forbidden ports (non-members and are not allowed to join the VLAN “Accounting” dynamically. Example 802.1Q VLAN add screen: 8-port Gigabit Ethernet Switch User’s Guide...
Page 91 8-port Gigabit Ethernet Switch User’s Guide Note: The default VLAN includes all of the ports on the Switch at first boot. As new VLANs are added, the member ports of the new VLAN are deleted from the default VLAN. To configure the member ports of an 802.1Q VLAN: Figure 6-28.
Page 92 VLAN. GMRP – The Group Multicast Registration Protocol enables the port to dynamically become a member of a multicast group. This function is not supported in the current version of the Switch software. To edit an existing 802.1Q VLAN: Highlight VLANs on the main menu and press Enter: Figure 6-30.
Page 93 8-port Gigabit Ethernet Switch User’s Guide Figure 6-31. VLAN Menu To edit an existing 802.1Q VLAN, highlight Edit 802.1Q VLANs and press Enter: Figure 6-32. Edit 802.1Q VLANs screen To edit an existing 802.1Q VLAN, highlight the Action:<Add/Modify> field and toggle between Add/Modify and...
Page 94 VID# number assigned to the port in the Edit Existing 802.1Q VLANs menu above. Use the arrow keys to highlight the remaining fields and the space bar to toggle between On and Off. 8-port Gigabit Ethernet Switch User’s Guide...
Page 95: Setting Up Ip Interfaces
GVRP – Group VLAN Registration Protocol enables the port to dynamically become a member of a VLAN. GMRP – Group Multicast Registration Protocol enables the port to dynamically become a member of a multicast group. This function is not supported in the current version of the Switch software. Setting Up IP Interfaces Note: A VLAN that does not have a corresponding IP interface defined for it, will function as a Layer 2 Only VLAN –...
Page 96 Each IP interface listed above will give a maximum of 2,097,150 unique IP addresses per interface (assuming the 10.xxx.xxx.xxx notation). To setup IP Interfaces on the switch: Highlight Layer 3 IP Networking from the Main Menu and press Enter. Figure 6-33. Setup Layer 3 – IP Networking menu...
Page 97 8-port Gigabit Ethernet Switch User’s Guide Toggle the Action:<Add/Modify> field to Add/Modify. Choose a name for the interface to be added and enter it in the ] field. The corresponding VLAN ID must also be entered in the VID:[ ] field. Enter the interface’s Interface Name:[ IP address and subnet mask in the corresponding fields.
Page 98: Multicasting
8-port Gigabit Ethernet Switch User’s Guide Multicasting Layer 2 Multicast Setup To access the Multicasting Menu, highlight Multicasting from the Main Menu and press Enter. Figure 6-35. Multicasting Menu IGMP Snooping Settings – by VLAN To Enable or Disable IGMP Snooping for a VLAN, highlight IGMP Snooping Settings, and press Enter.
Page 99 Switch IGMP Snooping:< This enables or disables IGMP snooping for the selected VLAN. > – This field determines whether the Switch is able to send IGMP snooping queries. Querier State:< Non-Querier – This indicates the IGMP interface will never try to become a querier in the VLAN.
Page 100: Ieee 802.1Q Multicast Forwarding
(Non-Member) specifies the port as not being a member of the multicast group, but the port can become a member of the multicast group dynamically. 8-port Gigabit Ethernet Switch User’s Guide...
Page 101: Static Router Port
8-port Gigabit Ethernet Switch User’s Guide Static Router Port Note: There is no difference between the setup of a ‘router port’ in Layer 2 Only mode and in IP Routing mode. Note: A router port allows UDP multicast and IGMP packets to be forwarded to a designated port on the switch regardless of VLAN configuration.
Page 102: Layer 3 Multicasting
Layer 3 switch would not be able to receive UDP data streams at all of its ports unless the UDP multicast packets were all forwarded to the router port. Note: A router port will be dynamically configured when IGMP query packets, RIPv2 multicast, DVMRP multicast, PIM-DM multicast packets are detected flowing into a port.
Page 103: Multicast Interface Configuration
8-port Gigabit Ethernet Switch User’s Guide Figure 6-40. IP Multicast Settings menu Multicast Interface Configuration To configure the multicast interface, highlight Multicast Interface Configuration and press Enter. Figure 6-41. Multicast Interface Configuration screen...
Page 104: Igmp Interface Configuration
Figure 6-42. IGMP Interface Configuration screen ] – Enter the name of the interface in this field. This interface must be previously > – This field can be toggled between V1-Querier and V2-Querier. This is the version of 8-port Gigabit Ethernet Switch User’s Guide...
Page 105: Dvmrp Interface Configuration
IP Address: – Displays the IP address corresponding to the IP interface entered above. State:<Enabled> – Can be toggled between Enabled and Disabled. Total Entries: – Displays the total number of entries into the Switch’s IGMP Static Member table. DVMRP Interface Configuration To configure DVMRP for an IP interface, highlight DVMPR Interface Configuration from the IP Multicasting Settings menu and press Enter.
Page 106 DVMRP will hold Neighbor Router reports before issuing poison route messages. The default is 35 seconds. 8-port Gigabit Ethernet Switch User’s Guide ] – This field allows an entry between 1 and 65,535 seconds and defines...
Page 107 State:<Disabled> – Toggle between Enabled and Disabled to enable or disable DVMRP for the IP interface. The default is Disabled. Include Unknown Neighbor Report:<Disabled> – Allows the Layer 3 switch to accept a DVMRP route report from a non-adjacent neighbor.
Page 108: Static Router Port
To setup a static router port: ] – This field allows an entry of between 1 and 18,724 seconds and determines the ] – This field allows an entry of between 1 and 18,724 seconds and determines the 8-port Gigabit Ethernet Switch User’s Guide...
Page 109 IGMP reports or implement IGMP snooping, a multi-port router connected to the router port of the Layer 3 switch would not be able to receive UDP data streams at all of its ports unless the UDP multicast packets were all forwarded to the router port.
Page 110: Mirroring
8-port Gigabit Ethernet Switch User’s Guide Mirroring To configure a port for port mirroring, highlight Mirroring from the Main Menu and press Enter. Figure 6-47. Mirroring Menu To select the target port, highlight Target Port Selection and press Enter.
Page 111 8-port Gigabit Ethernet Switch User’s Guide Figure 6-48. Target Port Selection screen The target port is the port where information will be duplicated and sent for capture and network analysis. This is the port where a network analyzer would be attached to capture packets duplicated from the source port.
Page 112: Priority
] – Enter the MAC address for which the priority queue is required this field. > – This field can be toggled among Low, Med-L (Medium Low), Med-H (Medium > – This field can be toggled among Src. (Source), Dst. (Destination), and 8-port Gigabit Ethernet Switch User’s Guide...
Page 113: Filtering
8-port Gigabit Ethernet Switch User’s Guide Filtering Layer 2 Filtering Layer 2 Only switch operation mode. To enter a MAC address into the filtering table: Highlight Filtering from the Main Menu and press Enter. Figure 6-51. Filtering Menu Highlight MAC Address Filter and press Enter.
Page 114: Layer 3 (Ip Routing) Filtering
The Switch is in IP Routing switch operation mode. With the Switch configured to Layer 3 Operation mode, both MAC and IP addresses can be entered into the filtering table. To enter an address, highlight Filtering from the Main Menu and press Enter.
Page 115 8-port Gigabit Ethernet Switch User’s Guide Figure 6-53. Filtering Menu To enter a MAC address into the filtering table, highlight MAC Address Filter and press Enter. Figure 6-54. Setup MAC Address Filter screen The Action:< > field can be toggled between Add/Modify and Delete using the space bar. Enter the VLAN ID in the VID:[ ] field and the MAC address to be filtered in the MAC Address:[ ] field.
Page 116 8-port Gigabit Ethernet Switch User’s Guide The Source/Destination: < > field can be toggled between Src. (source), Dst. (destination), and Either. The MAC address entered into the filtering table can be filtered as a source (packets will not be received from the MAC address), as a destination (packets will not be transmitted to the MAC address), or as either a source or destination (packets will not be received from or transmitted to the MAC address.
Page 117: Forwarding
Forwarding Layer 2 Forwarding Layer 2 Only switch operation mode To enter a MAC address into the switch’s forwarding table, highlight Forwarding from the Main Menu and press Enter. Figure 6-56. Forwarding Menu Highlight MAC Address Forwarding from the Forwarding Menu and press Enter.
Page 118: Ip Routing Forwarding
IP routing Switch Operation Mode With the Switch in Layer 3 Operation mode, entrees into the Switch’s forwarding table can be made using both MAC addresses and IP addresses. Static IP forwarding is accomplished by the entry of a Static IP Route.
Page 119 8-port Gigabit Ethernet Switch User’s Guide Figure 6-58. Forwarding Menu Highlight MAC Address Forwarding and press Enter. Figure 6-59. MAC Address Forwarding screen The Action:< > field can be toggled between Add/Modify and Delete using the space bar. Enter the VLAN ID in the ] field and the MAC address to be statically entered in the forwarding table in the MAC Address:[ ] field.
Page 120: Ip Static Routes
Highlight APPLY and press enter to make the changes current. Use Save Changes from the Main Menu to enter the changes into NV-RAM. IP Static Routes To enter a static IP route into the Switch’s forwarding table, highlight Static/Default Routes from the Forwarding Menu and press Enter. Figure 6-60. Setup Static IP Routes screen The Action:<...
Page 121: Spanning Tree
Highlight APPLY and press Enter to make the changes current. Use Save Changes from the Main Menu to enter the changes into NV-RAM. Spanning Tree Switch Spanning Tree Settings To globally configure STP on the Switch, highlight Spanning Tree on the Main Menu and press Enter.
Page 122 BPDU packets sent by the Root Bridge to tell all other Switches that it is indeed the Root Bridge. If you set a Hello Time for your Switch, and it is not the Root Bridge, the set Hello Time will be used if and when your Switch becomes the Root Bridge.
Page 123: Port Group Spanning Tree Settings
] field. The group name does not necessarily have to correspond to any name that has been previously Name:[ entered in the Switch’s configuration. Set the membership of the group by pressing the letter M for each desired port in the ] field.
Page 124: Port Trunking
This port is called the base port of the group, and all configuration options – including the VLAN configuration – that can be applied to the base port are applied to the entire link aggregation group. Figure 6-64. STP Port Settings screen 8-port Gigabit Ethernet Switch User’s Guide...
Page 125 To configure a port trunk group, highlight Port Trunking on the Main Menu and press Enter. Enter the group ID of one of the six possible port trunk groups configurable on the switch in the Group ID:[1] field. Enter the desired port number in the second field and specify the Group Width:[2]. This is the number of ports, in sequential order from the base port that will be included in the port trunk group.
Page 126: Switch Utilities
TFTP server to the switch. A configuration file can also be loaded into the switch from a TFTP server, switch settings can be saved to the TFTP server, and a history log can be uploaded from the switch to the TFTP server.
Page 127: Download Configuration File From Tftp Server
Highlight START and press Enter to initiate the file transfer. Download Configuration File from TFTP Server To download a switch configuration file from a TFTP server, highlight Download Configuration File from TFTP Server on the Switch Utilities menu and press Enter.
Page 128: Upload Configuration File To Tftp Server
Figure 6-68. Download Configuration File from TFTP Server screen Enter the IP address of the server and specify the location of the switch configuration file on the server. Highlight APPLY and press Enter record the IP address of the server. Use Save Changes from the Main Menu to enter the address into NV-RAM Highlight START and press Enter to initiate the file transfer.
Page 129: Save Log To Tftp Server
Enter the IP address of the server and the path and filename of the settings file on the server and press APPLY. Save Log to TFTP Server To save a history log to a TFTP server, highlight Save Log to TFTP Server on the Switch Utilities menu and press Enter.
Page 130: Ping
Enter the IP address of the server and the path and filename for the history log on the server. Highlight APPLY and press Enter to make the changes current. Ping To test the connection with another network device using Ping, highlight Ping Test on the Switch Utilities menu and press Enter. Figure 6-71. Ping screen Enter the IP address of the network device to be Pinged and the number of test packets to be sent (3 is usually enough).
Page 131 8-port Gigabit Ethernet Switch User’s Guide Figure 6-72. Switch Utilities menu Highlight BOOTP/DHCP Relay on the Switch Utilities menu and press Enter. Figure 6-73. BOOTP/DHCP Relay screen Toggle between Enabled and Disabled in the first field. The BootP hops count limit allows the number of hops (routers)
Page 132: Dns Relay
8-port Gigabit Ethernet Switch User’s Guide seconds) that the Switch will wait before forwarding a BOOTREQUEST packet. If the value in the seconds field of the packet is less than the relay time threshold, the packet will be dropped. The range is between 0 and 9999 seconds, with a default value of 0 seconds.
Page 133 8-port Gigabit Ethernet Switch User’s Guide Figure 6-75. DNS Relay screen The DNSR Status <Disabled> can be toggled between Disabled and Enabled using the space bar. Toggle the field to Enabled, enter the IP address of Name Server 1 and Name Server 2, if so desired.
Page 134: Network Monitoring
IP address. Highlight APPLY and press Enter to make the change current. Use Save Changes to enter the table into NV-RAM. Network Monitoring The DGS-3308 provides extensive network monitoring capabilities. Layer 2 Network Monitoring To display the network data compiled by the Switch, highlight Network Monitoring on the Main Menu and press Enter.
Page 135: Port Utilization
8-port Gigabit Ethernet Switch User’s Guide Figure 6-77. Network Monitoring Menu Port Utilization To view the port utilization, highlight Port Utilization on the Network Monitoring Menu and press Enter. Figure 6-78. Port Utilization screen...
Page 136: Port Error Packets
8-port Gigabit Ethernet Switch User’s Guide The Port Utilization screen shows the number of packets transmitted and received per second and calculates the percentage of the total available bandwidth being used on the port (displayed under %Util.). The Interval:<2 sec> field can be toggled from 2 seconds to 1 minute, or Suspend.
Page 137: Mac Address Forwarding Table
8-port Gigabit Ethernet Switch User’s Guide Figure 6-80. Port Packet Analysis screen In addition to the size of packets received or transmitted by the selected port, statistics on the number of unicast, multicast, and broadcast packets are displayed. Enter the port number of the port to be viewed. The Interval:<2 sec>...
Page 138: Igmp Snooping
8-port Gigabit Ethernet Switch User’s Guide Figure 6-81. Browse MAC Address Table screen The Browse By:<ALL > field can be toggled between ALL, MAC address, Port, and VLAN. This sets a filter to determine which MAC addresses from the forwarding table are displayed. ALL specifies no filter.
Page 139: Switch History
8-port Gigabit Ethernet Switch User’s Guide Figure 6-82. IGMP Snooping screen Switch History To view the switch history log, highlight Switch History from the Network Monitoring Menu and press Enter. Figure 6-83. Switch History screen...
Page 140: Layer 3 Network Monitoring
Layer 3 Network Monitoring When the Switch is in Layer 3 (IP Routing) mode, several items are added to the Network Monitoring Menu. The following items are added to the Network Monitoring Menu when the Switch is in Layer 3 (IP...
Page 141: Ip Routing Table
8-port Gigabit Ethernet Switch User’s Guide Figure 6-85. Browse IP Address screen To display a particular IP address, enter the IP address in the Jump to IP Address:[0.0.0.0] field, highlight GO, and press Enter. IP Routing Table To view the contents of the routing table, highlight Routing Table on the Network Monitoring Menu and press...
Page 142: Arp Table
8-port Gigabit Ethernet Switch User’s Guide Figure 6-86. Routing Table screen To display a particular Destination IP address, enter the IP address in the Jump to Destination Address:[0.0.0.0] field, the gateway address in the Gateway:[0.0.0.0] field, and the subnet mask in the Mask:[0.0.0.0] field, highlight GO, and press Enter.
Page 143: Browse Router Port
8-port Gigabit Ethernet Switch User’s Guide Figure 6-87. ARP Table screen To display a particular IP interface or an IP address, enter the IP interface name in the Jump to Interface Name:[ ] field and the IP address in the IP Address:[0.0.0.0] field, highlight GO, and press Enter. Highlighting CLEAR TABLE and pressing Enter will empty the table.
Page 144: Ip Multicast Forwarding Table
8-port Gigabit Ethernet Switch User’s Guide Figure 6-88. Browse Router Port screen To display a particular router port, enter the VLAN ID number in the Jump to VID:[0.0.0.0] field, highlight GO, and then press Enter. IP Multicast Forwarding Table To view the IP multicast forwarding table:...
Page 145: Igmp Group Table
8-port Gigabit Ethernet Switch User’s Guide Figure 6-89. Browse IP Multicast Forwarding Table screen To display a particular multicast group, enter the IP address in the Jump to Multicast Group:[0.0.0.0] field, the source IP address in the Source IP:[0.0.0.0] field, and the source subnet mask in the Source Mask:[0.0.0.0] field, highlight GO, and press Enter.
Page 146: Dvmrp Routing Table
8-port Gigabit Ethernet Switch User’s Guide Figure 6-90. IGMP Group Table screen To display an IGMP Group Table, enter the name of the routing interface in the Jump to Interface Name:[0.0.0.0] and the Multicast Group in the second field, highlight GO, and press Enter.
Page 147: Reboot And Factory Reset
8-port Gigabit Ethernet Switch User’s Guide Figure 6-91. DVMRP Routing Table screen To display a particular source IP address, enter the IP address in the Jump to IP Address:[0.0.0.0] field, the source subnet mask in the Source Mask:[0.0.0.0] field, highlight GO, and press Enter. Highlighting CLEAR TABLE and pressing Enter will empty the table.
Page 148 Reboot simply restarts the switch. Any configuration settings not saved using Save Changes from the Main Menu will be lost. The Switch’s configuration will be restored to the last configuration saved in NV-RAM. Save Configuration & Reboot saves the configuration to NV-RAM (identical to using Save Changes) and then restarts the switch.
Page 149 8-port Gigabit Ethernet Switch User’s Guide Figure 6-93. Reboot screen To reboot the Switch, in the mode entered above, highlight Yes and press Enter. Note: The factory defaults for the DGS-3308 are listed in Appendix D of this manual.
Page 150: Web-Based Network Management
2 bytes per character). Where there is a difference in the setup of the Switch between its two operational modes ( L ayer 2 Only and IP Routing), the sections are divided to correspond with the switch operating mode that is applicable.
Page 151: Vlan Layout
The DGS-3308FG allows the assignment of IP subnets to individual VLANs. Any VLAN configured on the Switch that is not assigned an IP subnet, will behave as a layer 2 VLAN and will not be capable of IP routing – even if the switch is in IP Routing mode.
Page 152: Getting Started
The second and last step is to configure the IP interface of the Switch. This can be done manually through a console (see the Configure IP Address section in chapter 6, “Using The Console Interface”).
Page 153 3. A listing of all user accounts and access levels is shown on the user accounts control table. This list is updated when Apply is executed. 4. Please remember that Apply makes changes to the switch configuration for the current session o nly. All changes (including User additions or updates) must be entered into non-volatile ram using the Save Changes command on the Maintenance menu - if you want these changes to be permanent.
Page 154: Saving Changes
Factory Reset The following menu is used to restart the Switch using only the configuration that was supplied by the factory. A factory reset returns all configuration options to their default values and restores the Switch’s configuration to the factory settings.
Page 155: Using Web-Based Management
8-port Gigabit Ethernet Switch User’s Guide Select Yes if you want the Switch to retain its current IP address. Select No to reset the Switch’s IP address to the factory default, 10.90.90.90. Click the Reset to Factory Default button to restart the Switch.
Page 156: Setting A Default Gateway
The default gateway parameter defines the IP address of a router or other network device to which IP packets are to be sent if destined for a subnet outside of that in which the switch is operating. This parameter must be set if you are attempting to manage the Switch from a remote network or across the Internet.
Page 157 Netscape Navigator 4.0 or above, or Internet Explorer 4.0 or above.) 2. Enter the IP address for the Switch you want to manage in the URL field of the browser. 3. The screen below will appear, prompting you to enter the user name and password for management access.
Page 158: Configuration
Area 1 Area Function Presents a graphical near real-time image of the front panel of the Switch. This area displays the Switch’s ports and expansion modules, showing port activity, duplex mode, or flow control, depending on the specified mode. Various areas of the graphic can be selected for performing management functions, including the ports, expansion modules, management module, or the case.
Page 159 8-port Gigabit Ethernet Switch User’s Guide...
Page 160 8-port Gigabit Ethernet Switch User’s Guide Layer 2 Mode...
Page 161 8-port Gigabit Ethernet Switch User’s Guide...
Page 162 8-port Gigabit Ethernet Switch User’s Guide...
Page 163: Switch Ip Setup
Switch’s agent to the management station. Note that the gateway must be defined if the management station is located on a different IP segment than the Switch. VID – Allows the input of a VLAN VID to restrict access to the management module on the Switch to a single VLAN.
Page 164: Power Supply & Cooling Fan Status
Figure 7-10. Switch Information – Basic Settings screen Items on the screen above include: Device Type – Type of Switch. MAC Address – The factory assigns each Switch a unique MAC address. Boot PROM Version – Device startup code. Firmware Version – System firmware version in ROM.
Page 165: Configure Ports
8-port Gigabit Ethernet Switch User’s Guide Figure 7-11. Power Supply & Cooling Fan Status screen Configure Ports You can select a port to be configured by clicking on the port at the top of the Web-based manager’s user interface. This port then becomes the currently selected port and all entries in the following figure will apply to this port.
Page 166: Switch Settings
Switch Settings on the Configuration menu) to one of the two switch operation modes: Layer 2 Only, Support IEEE 802.1Q VLANs and IP Routing, Support IEEE 802.1Q VLANs. To make a change in the operation mode of the Switch effective, click the Apply button. The Switch must be restarted to change the operating mode.
Page 167: Configure Layer 3 - Ip Networking
Upper Threshold (Kpps) – This is the number of thousands Broadcast/Multicast packets per second received by the Switch – on one of the base ports – that will trigger the Switch’s reaction to a Broadcast/Multicast storm. Configure Layer 3 - IP Networking...
Page 168 Authentication – Allows RIP to be configured to use a password. Setup IP Interfaces The first menu displays the current IP interfaces on the Switch. The IP Subnet - Edit menu is used to add a new IP interface and to edit an existing IP interface.
Page 169 Delete – Click this icon to delete an IP subnet from this table. IP Subnet - Edit The following window is used to add or modify an IP interface to the Switch. Items on the window above include: Figure 7-17. Setup IP Interface screen...
Page 170: Vlans
VID – The VLAN ID of the VLAN corresponding to this IP interface. Active – Allows this IP interface to be Active or Inactive on the Switch. Port Member – Allows the selection of ports to be members of this IP interface and its corresponding VLAN.
Page 171: Q Port Settings
Forbidden – Specifies the port as not being a static member of the VLAN, and as being forbidden from joining the VLAN dynamically. 802.1Q Port Settings The following read-only window allows you to view the current 802.1Q VLAN port settings on the Switch. Figure 7-21. 802.1Q Port Settings screen...
Page 172 If the two are equal, the port will receive the packet Description of item on the screen above: PVID – Shows the current PVID assignment for each port. The Switch’s default is to assign all ports to the Default_VLAN with a VID of 1.
Page 173: Multicasting
GMRP – For each corresponding port, GMRP can be Enabled or Disabled. Multicasting The following window enables you to set up Multicast forwarding on the Switch when you are in Layer 2 mode. Figure 7-24. Port GVRP Settings screen Figure 7-25. Port GMRP Settings screen...
Page 174: Igmp Snooping Settings
For example, if None is chosen, then an end station attached to the port can join the multicast group using GMRP. IGMP Snooping Settings The following window enables you to set Internet Group Management Protocol (IGMP) snooping settings on the Switch when you are in Layer 2 mode. Items on the screen above include: Figure 7-27.
Page 175 Dense Mode, and INACT – the interface is inactive. For example, if DVMRP is chosen, then this routing protocol will be used to forward multicast packets for the above IP interface. IGMP Interface Configuration The following window is used to configure Internet Group Management Protocol (IGMP) on the Switch (Layer 3 mode only).
Page 176 Items on the screen above include: Interface Name – The name of the IP interface (previously defined) on the switch for which a multicast interface is to be configured. IP Address – The IP address corresponding to the IP interface name.
Page 177 State – Allows DVMRP to be Disabled or Enabled for the above IP interface. The default is Disabled. PIM-DM Interface Configuration The following window is used to configure a Protocol Independent Multicast - Dense Mode (PIMDM) interface on the Switch (Layer 3 mode only).
Page 178 Items on the screen above include: Interface Name – The name of the IP interface (previously defined) on the switch for which a multicast interface is to be configured. IP Address – The IP address (sometimes referred to as a network address) corresponding to the interface name above.
Page 179: Priority
Delete – Click on the icon to delete the entry from the static router port table. Add a Static Router Port The following figure and table describe how to add a static router port on the Switch. Click on the Exit icon to return to the Static Router Port Settings window.
Page 180: Mirroring
VID – Displays the VLAN ID of the VLAN on which the MAC address above resides. MAC Address – Displays the MAC address for which priority on the Switch is to be established. Priority Level – Displays the priority of the above MAC address. The options are: Low, Med-L – medium low, Med-H –...
Page 181 8-port Gigabit Ethernet Switch User’s Guide The Target Port Selection window can be used to designate a single RJ-45 port pair for mirroring as shown below: Target Port Selection The following window is used to select a target port. A target port in a port mirroring pair is the port that will receive packets that are duplicated at the mirror port.
Page 182: Spanning Tree Protocol
The Spanning Tree Protocol can be used to detect and disable network loops, and to provide backup links between switches, bridges, or routers. This allows the Switch to interact with other bridging devices (that is, STP compliant switches, bridges, or routers) in your network to ensure that only one route exists between any two stations on the network.
Page 183 8-port Gigabit Ethernet Switch User’s Guide Items on the screen above include: Group Name – The group name of the Spanning Tree group to be added. Status – Allows STP to be Enabled or Disabled. Max Age: [6..40 sec] – The maximum time (in seconds) a device can wait without receiving a configuration message before attempting to reconfigure.
Page 184 MAC address will become the root device. Port Member – Check the ports you want to be member of the STP group. STP Group Configuration - Edit The following window is used to configure Spanning Tree Protocol (STP) for a group on the Switch.
Page 185: Stp Port Settings
Port Member – Check the ports you want to be member of the STP group. STP Port Settings The following window is used to configure the current STP port settings on the Switch. Figure 7-39. STP Group Configuration - Edit screen...
Page 186: Port Trunking
All of the ports in a trunk have to be treated as a whole when moved from/to, added or deleted from a VLAN. The Spanning Tree Protocol will treat all the ports in a trunk as a whole. Figure 7-40. STP Port Settings screen 8-port Gigabit Ethernet Switch User’s Guide...
Page 187: Forwarding
Use the Port Trunking Configuration screen to set up port trunks as shown below. Items on the screen above include: Group ID – The Switch allows up to 4 port trunks groups to be configured. The group number identifies each of these groups.
Page 188: Mac Forwarding
The following window is used for the entry of a Static/Default Routes into the IP routing table. Static/Default Routes Items on the screen above include: Figure 7-42. MAC Address Forwarding screen Figure 7-43. Static/Default Routes screen 8-port Gigabit Ethernet Switch User’s Guide...
Page 189 Delete – Click on this icon to delete the entry. Static/Default Routes – Add The following figure and table describe the entry of a Static/Default Route into the Switch’s IP routing table. Click on the Exit icon to return to the Static/Default Routes window.
Page 190: Filtering
MAC Address – The MAC address corresponding to the IP address above. Filtering The following figures and tables describe how to add a MAC or IP address to the MAC or IP filtering tables on the Switch. Figure 7-45. Static ARP screen Figure 7-46.
Page 191: Mac Filtering
Src/Dst – Allows the selection of the state of the MAC address under which packets will be dropped by the Switch. The options are; Dst – destination, Src – source, and Either. When Dst is chosen, packets with the above MAC address as their destination will be dropped.
Page 192: Bootp/Dhcp Relay
DHCP servers and their respective subnet names (or IP interface names). When the Switch receives packets destined for a BOOTP or DHCP server, it forwards them to specific servers as defined in the following configuration. The Switch also forwards packets from the BOOTP or DHCP servers to the appropriate subnets.
Page 193 The second task is to tell the BOOTP/DHCP relay agent where the servers are located in terms of IP addresses and subnet names (IP interface names). The following figure and table describe how to set up the static Bootp Relay function on the Switch. Figure 7-50. BOOTP/DHCP Relay Interface Setup screen Items on the screen above include: Figure 7-49.
Page 194: Dns Relay
(or IP interface names). When the switch receives packets destined for a DNS server, it forwards them to specific servers as defined in the following configuration. The Switch also forwards packets from the DNS servers to the appropriate subnets.
Page 195: Remote Management Setup
Remote Management Setup Use the five Remote Management Setup windows–which are the same whether the Switch is in Layer 2 mode or Layer 3 mode–to configure the IP addresses of up to 3 Management stations, to configure SNMP Community strings, to enter the IP addresses of Trap receivers, to create and manage user accounts, and to configure the Serial Port settings.
Page 196: Snmp Community Settings
Use the Community Strings screen to display and modify parameters for the Simple Network Management Protocol (SNMP). The Switch includes an on-board SNMP agent that monitors the status of its hardware, as well as the traffic passing through its ports. A computer attached to the network, called a Network Management Station (NMS), can be used to access this information.
Page 197: Setup Trap Receivers
Items on the screen above include: IP Address – The IP address of the management station that will receive traps generated by the Switch. SNMP Community String – A string of up to 20 characters used for authentication of users wanting to receive traps from the Switch’s SNMP agent.
Page 198 A listing of all user accounts and access levels is shown on the Setup User Accounts table. This list is updated when Apply is executed. Please remember that Apply makes changes to the switch configuration for the current session only. All changes (including User additions or updates) must be entered into non-volatile ram using the Save Changes command on the Maintenance menu - if you want these changes to be permanent.
Page 199: Serial Port Settings
Maintenance menu - if you want these changes to be permanent. Serial Port Settings The following screens are used to configure the Switch’s serial port (sometimes referred to as a ‘console port’). Items on the screen above include: Console Settings: Baud Rate –...
Page 200: Network Monitoring
Time Out – Specifies length of time a Telnet session can be idle. When this time has expired, the Switch will disconnect the user. The default value is 10 minutes. Sessions – The number of Telnet sessions ranges from 1 to 4.
Page 201 8-port Gigabit Ethernet Switch User’s Guide Items on the screen above include: Update Interval – The interval (in seconds) that the table is updated. The default is Suspend. Rx Received packets CRC Error – For 10 Mbps ports, the counter records CRC errors (FCS or alignment errors). For 100 Mbps ports, the counter records the sum of CRC errors and code errors (frames received with rxerror signal).
Page 202: Port Packet Analysis
Coll. – An estimate of the total number of collisions on this network segment. Port Packet Analysis The following port packet statistics are compiled by the Switch’s management agent: Items on the screen above include: Update Interval – The interval (in seconds) that the table will be updated. The default is Suspend.
Page 203 Clear – Click this button to clear all counters. Port Utilization History The Switch allows you to display a graphical representation of a selected port’s utilization. These figures are the percentage of bandwidth being used. Select the desired polling increment in the Update Interval field: 10 seconds, 20 seconds, 30 seconds, 60 seconds, or Suspend.
Page 204: Address Table
8-port Gigabit Ethernet Switch User’s Guide Address Table The following section describes how to browse the Switch’s address tables. Browse MAC Address Table The Web Manager allows the Switch’s MAC address table (sometimes referred to as a forwarding table) to be viewed.
Page 205: Ip Address Table
MAC Address – The MAC address entered into the address table. Port – The port that the MAC address above corresponds to. Learned – How the Switch discovered the MAC address. The possible entries are Dynamic, Self, and Static. IP Address Table The Web Manager allows you to view the IP address table.
Page 206: Routing Table
8-port Gigabit Ethernet Switch User’s Guide Figure 7-65. IP Address Table screen To display a particular IP address, enter the IP address in the Jump to IP Address field and click GO. Routing Table The Web Manager allows you to view the contents of the routing table.
Page 207 8-port Gigabit Ethernet Switch User’s Guide Figure 7-66. Routing Table screen To display a particular Destination IP address, enter the IP address, netmask, and default gateway in the three fields above and then click Go. Clicking Clear Table will empty the table.
Page 208: Applications
8-port Gigabit Ethernet Switch User’s Guide Figure 7-67. ARP Table screen To browse the ARP table, enter the IP interface name in the first field, the IP address in the second field, and then click Go. Clicking Clear Table will empty the table.
Page 209 Thus, forwarding all IP UDP multicast packets to a static router port guarantees that all ports of a multicast-enabled router – attached to the Switch – can reach all multicast group members through the attached router’s other ports.
Page 210 Port Members – Ports that are router ports, both statically and dynamically assigned. IGMP Snooping The Switch’s IGMP snooping table can be browsed using the Web Manager. The table is displayed by VLAN IP (VID). Items on the screen above include: VID –...
Page 211 To display a DVMRP routing entries, enter the IP address and source subnet mask in the first two fields and click GO. Clicking Clear Table will empty the table. Switch History The Web-based manager allows the Switch’s history log, as compiled by the Switch’s management agent, to be viewed.
Page 212: Maintenance
TFTP services. Trivial File Transfer Protocol (TFTP) services allow the Switch firmware to be upgraded by downloading a new firmware file from a TFTP server to the Switch. A configuration file can also be loaded into the Switch, and Switch settings can be saved to a TFTP server. In addition, the Switch’s history log can be uploaded from the Switch to a TFTP server.
Page 213: Upgrade Firmware From Tftp Server
Path and File Name – The full file name, including path, of the new firmware file on the TFTP server. Download Configuration File from TFTP Server A configuration file can be downloaded from a TFTP server to the Switch. This file is then used by the Switch to configure itself.
Page 214: Save Log To Tftp Server
Path and File Name – The full file name, including path, of the settings file on the TFTP server. Save Log to TFTP Server The switch’s management agent can upload its history log file to a TFTP server. Items on the screen above include: Server IP Address –...
Page 215: Factory Reset
All user-entered configuration information will be lost. Figure 7-80. Factory Reset screen Click Yes if you want the Switch to retain its current IP address. Click No to reset the Switch’s IP address to the factory default, 10.90.90.90. Click the Reset to Factory Default button to restart the Switch.
Page 216: Restart System
8-port Gigabit Ethernet Switch User’s Guide Restart System The following menu is used to restart (reboot) the Switch. Click Yes to save the current Switch configuration to non-volatile RAM (flash RAM), or No if you want to restart the Switch using the last-saved (previous) configuration.
Page 217: Technical Specifications
1000BASE-SX: ECHNICAL General IEEE 802.3 10BASE-T Ethernet (DGS-3308TG) IEEE 802.3u 100BASE-TX Fast Ethernet (DGS-3308TG) IEEE 802.3z 1000BASE-SX Gigabit Ethernet (DGS-3308FG) IEEE 802.3ab 1000BASE-T Gigabit Ethernet (DGS-3308TG) IEEE 802.1 P/Q VLAN IEEE 802.3x Full-duplex Flow Control ANSI/IEEE 802.3 NWay auto-negotiation CSMA/CD...
Page 218: Physical And Environmental
Transmission Method: Store-and-forward RAM Buffer: 512 KB per device Filtering Address Table: 8K MAC address per device Packet Filtering/ Full-wire speed for all connections. Forwarding Rate: 1,488,000 pps per port MAC Address Learning: Automatic update. 8-port Gigabit Ethernet Switch User’s Guide...
Page 219 8-port Gigabit Ethernet Switch User’s Guide Forwarding Table Age Time: IP Address Performance Max age: 10–1000000 seconds. Default = 300. 2K per device...
Page 220 When connecting the Switch to another switch, a bridge or a hub, a normal cable is necessary. Please review the following for matching cable pin assignment. Figure B-1. The standard RJ-45 receptacle/connector Table B-1. The standard Category 3 cable, RJ-45 pin assignment...
Page 221: Runtime Switching Software Default Settings
8-port Gigabit Ethernet Switch User’s Guide UNTIME Load Mode Switch Operation Mode Configuration update Firmware update Configuration file name Firmware file name Out-of-band baud rate RS232 mode IP address Subnet mask Default Gateway BootP service TFTP server IP address IGMP Snooping...
Page 222: Understanding And Troubleshooting The Spanning Tree Protocol
Blocking State A port in the blocking state does not forward packets. When the switch is booted, a BPDU is sent to each port in the switch putting these ports into the blocking state. A switch initially assumes it is the root, and then begins the exchange of BPDUs with other switches.
Page 223: Listening State
Listening State The listening state is the first transition for a port from the blocking state. Listening is an opportunity for the switch to receive BPDUs that may tell the switch that the port should not continue to transition to the forwarding state, but should return to the blocking state (that is, a different port is a better choice).
Page 224: Learning State
A port in the learning state does the following: Discards frames received from the network segment to which it is attached. Discards packets sent from another port on the switch for forwarding. Adds addresses to its forwarding database. Receives BPDUs and directs them to the CPU.
Page 225: Disabled State
A port in the forwarding state does the following: Forwards packets received from the network segment to which it is attached. Forwards packets sent from another port on the switch for forwarding. Incorporates station location information into its address database.
Page 226: Troubleshooting Stp
Spanning Tree Protocol Failure A failure in the STA generally leads to a bridging loop. A bridging loop in an STP environment comes from a port that should be in the blocking state, but is forwarding packets. 8-port Gigabit Ethernet Switch User’s Guide...
Page 227: Full/Half Duplex Mismatch
8-port Gigabit Ethernet Switch User’s Guide In this example, B has been elected as the designated bridge and port 2 on C is in the blocking state. The election of B as the designated bridge is determined by the exchange of BPDUs between B and C. B had a better BPDU than C. B continues sending BPDUs advertising its superiority over the other bridges on this LAN.
Page 228: Unidirectional Link
If the MAX AGE is set too low, this time is reduced. Resource Errors The DGS-3308FG/DGS-3308TG Layer 3 switch performs its switching and routing functions primarily in hardware, using specialized ASICs. STP is implemented in software and is thus reliant upon the speed of the CPU and other factors to...
Page 229: Identifying A Data Loop
Although the STP can elect a root bridge, a well-designed network will have an identifiable root for each VLAN. Careful setup of the STP parameters will lead to the selection of this best switch as the root for each VLAN. Redundant links can then be built into the network.
Page 230 This is a common network design. The switches C and D have redundant links to the backbone switches A and B using trunks. Trunks, by default, carry all the VLAN traffic from VLAN 1 and VLAN 2. So switch C is not only receiving traffic for VLAN 1, but it is also receiving unnecessary broadcast and multicast traffic for VLAN 2.
Page 231 A or B from the network. Impact of Layer 3 Switching. The IP routing operational mode of the DGS-3308FG/DGS-3308TG Layer 3 switch can accomplish the following: Building a forwarding table, and exchanging information with its peers using routing protocols.
Page 232 8-port Gigabit Ethernet Switch User’s Guide Using layer 3 switches and IP routing eliminates the need for STP port blocking because the packets are routed by destination addresses. The link redundancy remains, and relying on the routing protocols gives a faster convergence than with STP.
Page 233: Brief Review Of Bitwise Logical Operations
8-port Gigabit Ethernet Switch User’s Guide RIEF The logical operation compares 2 bits and if they are both “ The logical operation compares 2 bits and if either or both bits are operation compares 2 bits and if exactly one of them is a...
Page 234: Index
Drop Pkts...198 DVMRP Routing Table...207 Dynamic filtering ...18 Egress...166 Egress port ...24 Ethernet protocol...6 Ex. Coll...198 ExDefer...198 8-port Gigabit Ethernet Switch User’s Guide Filtering...18, 185 Flash memory ...5 Forward Delay...33, 178, 180 Forwarding ...18, 182 Fragments ...197 Front Panel...10 gateway router...16 Gigabit Ethernet...6...
Page 235: Rj-45 Pin Specification
8-port Gigabit Ethernet Switch User’s Guide Mirroring...175 module...10 Multicasting...169 Network Classes Class A, B, C for Subnet Mask...70 NV-RAM...62, 149 ...214 Operating Temperature Out-of-Band/Console Setting menu...72 Oversize...197 password ...58 Port Configuration...160 Port Error Packets ...196 Port GMRP Settings...168 Port Ingress Filter...167 Port Priority ...33...
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Page 237 South Africa D-Link South Africa 102 – 106 Witchhazel Avenue, Einstein Park 2, Block B, Highveld Technopark, Centurion, South Africa TEL: 27 (0) 12-665-2165 FAX: 27 (0) 12-665-2186 URL: www.d-link.co.za E-MAIL: attie@d-link.co.za Spain D-Link Iberia Gran Via de Carlos III, 843º Edificio Trade, 08028 Barcelona, Spain TEL: 34 93 4965751 FAX: 34 93 4965701 URL: www.dlinkiberia.es...

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