Enterasys VH-2402S Management Manual
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Enterasys VH-2402S Management Manual

Vertical horizon fast ethernet switch
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VERTICAL HORIZON
VH-2402S
FAST ETHERNET SWITCH
MANAGEMENT GUIDE
9033645-01

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  • Page 1 VERTICAL HORIZON VH-2402S FAST ETHERNET SWITCH MANAGEMENT GUIDE 9033645-01...
  • Page 3 Only qualified personnel should perform installation procedures. Enterasys Networks reserves the right to make changes in specifications and other information contained in this document without prior notice. The reader should in all cases consult Enterasys Networks to determine whether any such changes have been made.
  • Page 4 Notice 9033645-01...

  • Page 5: Table Of Contents

    2. VH-2402S USER INTERFACE ........
  • Page 6 Setting SNMP Management Access ......70 Viewing Switch Statistics ........70 Configuring Port Mirroring .
  • Page 7 VLANs and Frame Tagging ....... . . 91 VH-2402S VLAN Configuration....... 92 Assigning Ports to VLANs .
  • Page 8 Table of Contents VH-2402S...

  • Page 9: Management Overview

    Management Module. Use the null- modem cable provided with this package, or use a null-modem connection that is compatible with the console port pin assignments shown in Appendix A of the VH-2402S User Guide. 9033645-01 Management Overview 1...

  • Page 10: Remote Management Via The Console Port

    RS232 cable with a 9-pin connector on one end and a 25-pin connector on the other end. Set the modem at the switch’s site to force auto-answer mode. The following is a sample initialization string: “ATQ1S0=1&D0&K0&W” as defined below:...
  • Page 11 In-Band Network Connection The on-board configuration program can be accessed using Telnet from any computer attached to the network. The switch and stack can also be managed by any computer using a Web browser (Internet Explorer 4.0 or above, or Netscape Navigator 4.0 or above), or from a network computer using network management software.
  • Page 12 4 Management Overview VH-2402S...

  • Page 13: Vh-2402S User Interface

    (with a direct cable connection or over modems), or using Telnet to access the Management Module over the network. These menus allow you to reconfigure the switch, as well as to monitor the status and performance of the switch or the attached stack. The menus have a layout similar to the sample Main Menu shown in Figure 2-1.

  • Page 14: User Access

    The default user names are “admin” and “guest,” with no passwords. The administrator has Read/Write access, which allows you to read and modify switch information. The guest has Read Only access to the management program, which allows you to view switch information, but not modify any operating parameters.

  • Page 15: Factory Defaults

    Factory Defaults Table 2-1 lists the default settings for switch configuration parameters. Each parameter can be changed via the console menus or Telnet. Table 2-1. Factory Default Settings Parameter Multicast Filtering GMRP IGMP Multicast Filtering Port Configuration Flow Control Speed and Duplex...
  • Page 16 Parameter Virtual LANs Acceptable VLAN Frame Type Configurable PVID Tagging GVRP Untagged VLAN Group Assignment VLAN Ingress Filtering VLAN Learning 8 VH-2402S User Interface Default Value Disabled False VH-2402S...

  • Page 17: Main Menu

    The Main Menu is the first screen seen after successfully logging into the system. Figure 2-2 shows the Main Menu and the accompanying table describes the Main Menu Vertical Horizon Local Management -- VH-2402S Use <TAB> or arrow keys to move. <Enter> to select. Selection...
  • Page 18 Configuration Network Monitor Menu Port Statistics RMON Statistics Unicast Address Table 10 VH-2402S User Interface Description Enables any port, enables/disables flow control, and sets communication mode to auto-negotiation, full duplex or half duplex. Displays operational status, including link state, flow control method, and duplex mode.

  • Page 19: System Information Menu

    Use the System Information Menu to display a basic description of the switch, including contact information, and hardware/firmware versions. Vertical Horizon Local Management -- VH-2402S Use <TAB> or arrow keys to move. <Enter> to select. Figure 2-3. System Information Menu...

  • Page 20: Displaying System Information

    Displaying System Information Use the System Information screen to display descriptive information about the switch, or for quick system identification as shown in the following figure and table. Vertical Horizon Local Management -- VH-2402S System Description : Vertical Horizon VH-2402S System Object ID : 1.3.6.1.4.1.52.3.9.1.10.7...

  • Page 21: Displaying Switch Version And Module Information

    Use the Switch Information screen to display hardware/firmware version numbers for the main board and agent module, as well as the power status and modules plugged into the system. Vertical Horizon Local Management -- VH-2402S <OK> Use <TAB> or arrow keys to move. <Enter> to select...

  • Page 22: Management Setup Menu

    TFTP Download Downloads new version of firmware to update your system (in- band). Configuration Save & Saves the switch configuration to a file on a TFTP server. This file Restore can be later downloaded to restore the configuration. Management Specifies if management access to the switch is available from all Configuration VLANs or restricted to one VLAN.

  • Page 23: Changing The Network Configuration

    Internet Protocol (IP) parameters, enable the on-board Web Agent, or to set the number of concurrent Telnet sessions allowed. The screen shown below is described in the following table. Vertical Horizon Local Management -- VH-2402S <APPLY> Use <TAB> or arrow keys to move. <Enter> to select.

  • Page 24: Ip Configuration

    Use the IP Configuration screen to set the bootup option, or configure the switch’s IP parameters. The screen shown below is described in the following table. Vertical Horizon Local Management -- VH-2402S Use <TAB> or arrow keys to move, other keys to make changes. Parameter...

  • Page 25: Ip Connectivity Test (Ping)

    Use the IP Connectivity Test to see if another site on the Internet can be reached. The screen shown below is described in the following table. Vertical Horizon Local Management -- VH-2402S Network Configuration: IP Connectivity Test (Ping) Use <TAB> or arrow keys to move, other keys to make changes.

  • Page 26: Http Configuration

    TCP port that will provide HTTP service. The screen shown below is described in the following table. Vertical Horizon Local Management -- VH-2402S <APPLY> Use <TAB> or arrow keys to move, <Space> to scroll options.

  • Page 27: Configuring The Serial Port

    Serial Port Configuration screen shown below and described in the following table. Vertical Horizon Local Management -- VH-2402S <APPLY> Use <TAB> or arrow keys to move, <Space> to scroll options.

  • Page 28: Assigning Snmp Parameters

    NMS must first submit a valid community string for authentication. The options for configuring community strings and related trap functions are described in the following sections. Vertical Horizon Local Management -- VH-2402S <APPLY> Use <TAB> or arrow keys to move, <Space> to scroll options.

  • Page 29: Configuring Community Names

    Configuring Community Names The following figure and table describe how to configure the community strings authorized for management access. Up to 5 community names may be entered. Vertical Horizon Local Management -- VH-2402S 1. public 2. private <APPLY> Use <TAB> or arrow keys to move, other keys to make changes.

  • Page 30: Configuring Ip Trap Managers

    Configuring IP Trap Managers The following figure and table describe how to specify management stations that will receive authentication failure messages or other trap messages from the switch. Up to 5 trap managers may be entered. Vertical Horizon Local Management -- VH-2402S <APPLY>...

  • Page 31: Console Login Configuration

    System Configuration Program, contact Enterasys Technical Support for assistance.) The parameters shown on this screen are indicated in the following figure and table. Vertical Horizon Local Management -- VH-2402S <APPLY> Use <TAB> or arrow keys to move, other keys to make changes.

  • Page 32: Downloading System Software

    Using TFTP Protocol to Download Over the Network Use the TFTP Download menu to load software updates into the switch. The download file should be an VH-2402S file from Enterasys; otherwise the agent will not accept it. The success of the download operation depends on the accessibility of the TFTP server and the quality of the network connection.

  • Page 33: Saving The System Configuration

    Use the Configuration Save & Restore menu to save the switch configuration settings to a file on a TFTP server. The file can be later downloaded to the switch to restore the switch’s settings. The success of the operation depends on the accessibility of the TFTP server and the quality of the network connection.

  • Page 34: Configuring Management Access

    Configuring Management Access Use the Management Configuration menu to define which VLAN has management access to the switch. Parameters shown on this screen are indicated in the following figure and table. Vertical Horizon Local Management -- VH-2402S Management VLAN VLAN <APPLY>...

  • Page 35: Configuring The Switch

    Virtual LANs. Each of the setup screens provided by these configuration menus is described in the following sections. Vertical Horizon Local Management -- VH-2402S Port Configuration ... Port Information ... Spanning Tree Configuration ... 802.1Q VLAN Base Information ...
  • Page 36 Assigns ports that are attached to hosts who want to receive a Configuration specific multicast service. Port Security Allows you to enable and configure port security for the switch. Configuration * Not implemented in the current firmware release. 28 VH-2402S User Interface...

  • Page 37: Configuring Port Parameters

    Configuring Port Parameters Use the Port Configuration menus to set or display communication parameters for any port or module on the switch. Vertical Horizon Local Management -- VH-2402S Port ------------------------------------------------------------------------- <APPLY> <OK> <CANCEL> <PREV Unit> <NEXT UNIT> <PREV PAGE> <NEXT PAGE>...

  • Page 38: Viewing The Current Port Configuration

    To change any of the port settings, use the Port Configuration menu. The parameters shown in the following figure and table are for the RJ-45 ports. Vertical Horizon Local Management -- VH-2402S Port Type...

  • Page 39: Using The Spanning Tree Algorithm

    The Spanning Tree Algorithm 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, an STA-compliant switch, bridge or router) in your network to ensure that only one route exists between any two stations on the network.
  • Page 40 Priority 32,768 Hello Time Max (Message) Age Forward Delay 32 VH-2402S User Interface Description Enable this parameter to participate in an STA compliant network. Device priority is used in selecting the root device, root port, and designated port. The device with the highest priority becomes the STA root device.
  • Page 41 (Note that the Spanning Tree Configuration screen for the expansion slots also indicates module type.) Vertical Horizon Local Management -- VH-2402S Fast forwarding mode of all ports : [Enable] [Disable] Spanning Tree Port Configuration : Unit 1 Port 1-12 Port <APPLY>...

  • Page 42: Viewing The Current Spanning Tree Configuration

    To make any changes to the parameters for the Spanning Tree, use the Spanning Tree Configuration menu. Vertical Horizon Local Management -- VH-2402S Use <TAB> or arrow keys to move. <Enter> to select. Figure 2-25. Spanning Tree Information...

  • Page 43: Displaying The Current Bridge Sta

    The path cost from the root port on this switch to the root device. Root Port The number of the port on this switch that is closest to the root. This switch communicates with the root device through this port. If there is no root port, then this switch has been accepted as the root device of the spanning tree network.
  • Page 44 Displaying the Current STA for Ports or Modules The parameters shown in the following figure and table are for port or module STA Information (Port 1-12, Port 13-24, Port 25-32). Vertical Horizon Local Management -- VH-2402S Spanning Tree Port Information : Unit 1 Port 1-12 Port...
  • Page 45 A port on a network segment with no other STA-compliant bridging device is always forwarding. If two ports of a switch are connected to the same segment and there is no other STA device attached to this segment, the port with the smaller ID forwards packets and the other is blocked.

  • Page 46: Using A Mirror Port For Analysis

    You can use the Mirror Port Configuration screen to designate a single port pair for mirroring as shown below: Vertical Horizon Local Management -- VH-2402S <APPLY> Use <TAB> or arrow keys to move, other keys to make changes.

  • Page 47: Configuring Port Trunks

    You can configure up five trunk connections (combining 2~4 ports into a fat pipe) between any two standalone VH-2402S switches, or up to 12 for an entire stack. However, before making any physical connections between devices, use the Trunk Configuration menu to specify the trunk on the devices at both ends.
  • Page 48 You can use the Port Trunking Configuration screen set up port trunks as shown below: Vertical Horizon Local Management -- VH-2402S Trunk ID Status ------------- ------------- ---------------- ---------------- ---------------- ---------------- ------------ ------------ ------------ Trunk ID : 1 [Show] [More] [Enable] [Disable] Use <TAB>...

  • Page 49: Igmp Multicast Filtering

    This switch uses IGMP (Internet Group Management Protocol) to query for any attached hosts who want to receive a specific multicast service. The switch looks up the IP Multicast Group used for this service and adds any port which received a similar request to that group. It then propagates the service request on to any neighboring multicast switch/router to ensure that it will continue to receive the multicast service.

  • Page 50: Configuring Igmp

    Configuring IGMP This protocol allows a host to inform its local switch/router that it wants to receive transmissions addressed to a specific multicast group. You can use the IGMP Configuration screen to configure multicast filtering shown below: Vertical Horizon Local Management -- VH-2402S <APPLY>...

  • Page 51: Configuring Broadcast Storm Control

    Configuring Broadcast Storm Control Use the Broadcast Storm Control Configuration screen to enable broadcast storm control for any port on the switch, as shown below: Vertical Horizon Local Management -- VH-2402S Broadcast Storm Control Configuration : Unit 1 Port 1-12...

  • Page 52: Configuring Bridge Mib Extensions

    The Bridge MIB includes extensions for managed devices that support Traffic Classes, Multicast Filtering and Virtual LANs. To configure these extensions, use the Extended Bridge Configuration screen as shown below: Vertical Horizon Local Management -- VH-2402S Bridge Capability : (Read Only) Bridge Settings : <APPLY>...
  • Page 53 As default this switch uses Shared VLAN Learning (SVL), whereby all ports share one VLAN filtering database. However, you can set the switch to use Independent VLAN Learning (IVL), where each port maintains its own filtering database. Note that when you change from one method to the other, the switch will automatically reset and the current VLAN configuration will be lost..

  • Page 54: Configuring Traffic Classes

    Configuring Traffic Classes IEEE 802.1p defines up to 8 separate traffic classes. This switch supports Quality of Service (QoS) by using two priority queues, with weighted fair queuing for each port. You can use the 802.1P Configuration menu to configure the default priority for each port, or to display the mapping for the traffic classes as described in the following sections.

  • Page 55: Port Priority Configuration

    802.1P Port Priority Configuration menu to adjust default priority for any port as shown below: Vertical Horizon Local Management -- VH-2402S 802.1P Port Priority Configuration : Unit 1 Port 1 - 12 <APPLY> <OK> <CANCEL> <PREV UNIT> <NEXT UNIT> <PREV PAGE> <NEXT PAGE>...

  • Page 56: P Port Traffic Class Information

    802.1P Port Traffic Class Information This switch provides two priority levels with weighted fair queuing for port egress. This means that any frames with a default or user priority from 0~3 are sent to the low priority queue “0” while those from 4~7 are sent to the high priority queue “1”...

  • Page 57: Configuring Virtual Lans

    Configuring Virtual LANs You can use the VLAN configuration menu to assign any port on the switch to any of up to 256 LAN groups. In conventional networks with routers, broadcast traffic is split up into separate domains. Switches do not inherently support broadcast domains.

  • Page 58: Q Vlan Current Table Information

    VLAN for one or two switches, you can assign ports to the same untagged VLAN (page 53). The current configuration is shown in the following figure. Vertical Horizon Local Management -- VH-2402S Unit Current Egress Ports...

  • Page 59: Q Vlan Static Table Configuration

    VLAN via the GVRP protocol. (Also, note that all ports can only belong to one untagged VLAN. This is set to VLAN 1 by default, but can be changed via the Port Assignment VLAN Configuration screen on page 53.) Vertical Horizon Local Management -- VH-2402S Unit Egress Ports 111111111111 111111111111 ----...
  • Page 60 For example, the following screen displays settings for VLAN 2, which includes tagged ports 1-6, and forbidden port 12. (Note that the dashed lines show that there are no switch units in this system other than Unit 1.) Vertical Horizon Local Management -- VH-2402S...
  • Page 61 Port Assignment VLAN Configuration Use this screen to configure port-specific settings for IEEE 802.1Q VLAN features. Vertical Horizon Local Management -- VH-2402S Unit Port PVID -------------------------------------------------------------------------- Unit ID : 1 Port ID : 1 <APPLY> Use <TAB> or arrow keys to move, <Space> to scroll options.

  • Page 62: Multicast Router Port Information

    The switch ports that have been automatically listed as being List attached to a neighboring multicast router/switch. Static Router Port List The switch ports that have been manually listed as being attached to a neighboring multicast router/switch. Sorted by VID The VLAN ID number used to sort the list.

  • Page 63: Static Multicast Router Port Configuration

    Static Multicast Router Port Configuration You can use the Static Multicast Router Port Configuration screen to assign ports that are attached to a neighboring multicast router/switch. Vertical Horizon Local Management -- VH-2402S Sorted by VID : 1 [Show] [More] <OK>...

  • Page 64: Igmp Member Port Configuration

    IGMP Member Port Configuration You can use the IGMP Member Port Configuration screen to assign ports that are attached to hosts who want to receive a specific multicast service. Vertical Horizon Local Management -- VH-2402S Unit Dynamic IGMP Member Port List -----------------------------------------------------------------------------------------------------------...

  • Page 65: Port Security Configuration

    Port Security Configuration Use the Port Security Configuration screen to enable and configure port security for the switch. Port Security allows you to configure each port with a list of MAC addresses of devices that are authorized to access the network through that port.

  • Page 66: Monitoring The Switch

    IP multicast addresses, and the static (unicast) address table. Each of the screens provided by these menus is described in the following sections. Vertical Horizon Local Management -- VH-2402S Use <TAB> or arrow keys to move. <Enter> to select. Figure 2-45. Network Monitor Menu...

  • Page 67: Displaying Port Statistics

    Port Statistics display key statistics from the Ethernet-like MIB for each port. Error statistics on the traffic passing through each port are displayed. This information can be used to identify potential problems with the switch (such as a faulty port or unusually heavy loading). The values displayed have been accumulated since the last system reboot.

  • Page 68: Displaying Rmon Statistics

    Values displayed have been accumulated since the last system reboot. Vertical Horizon Local Management -- VH-2402S Drop Events Received Bytes...
  • Page 69 (excluding framing bits but including FCS octets). 1024-1518 Byte The total number of packets (including bad packets) received and Frames transmitted that were between 1024 and 1518 octets in length inclusive (excluding framing bits but including FCS octets). 9033645-01 VH-2402S User Interface 61...

  • Page 70: Displaying The Unicast Address Table

    VLAN), sorted by MAC address or VLAN ID. You can search for a specific address, clear the entire address table, or information associated with a specific address, or set the aging time for deleting inactive entries. Vertical Horizon Local Management -- VH-2402S Aging Time: 300 -------------------------------------------------------------------------------------------------------- 00-00-00-AA-AA-06...

  • Page 71: Displaying The Ip Multicast Registration Table

    [Show] Displays the address table sorted on VID and then Multicast IP. [More] Scrolls through the entries in the address table. 9033645-01 Vertical Horizon Local Management -- VH-2402S IP Multicast Registration Table Unit Multicast Group Port Lists 000000001100 110000000000 00...

  • Page 72: Configuring Static Unicast Addresses

    Use the Static Unicast Address Table Configuration screen to manually configure host MAC addresses in the unicast table. You can use this screen to associate a MAC address with a specific VLAN ID and switch port as shown below. Vertical Horizon Local Management -- VH-2402S...

  • Page 73: System Restart Menu Figure

    Select the System Restart Menu under the Main Menu to reset the management agent. The reset screen includes options as shown in the following figure and table. Vertical Horizon Local Management -- VH-2402S Restart Option : POST Reload Factory Defaults...
  • Page 74 66 VH-2402S User Interface VH-2402S...

  • Page 75: Configuring & Monitoring The Switch

    The switch console menus allow you to modify default switch settings and configure the switch for network management. They also allow you to monitor switch performance and status. See Section 2, “VH-2402S User Interface,” for an overview of the menu hierarchy and a description of all menus.

  • Page 76: Setting Password Protection

    If you forget your password, contact your Enterasys Networks Support Representative. You are automatically logged out from the console menus based on the Lock-out Time setting in the Console Login Configuration Menu.

  • Page 77: Assigning An Ip Address

    If you see a DOWN status for a connected port, plug the cable into another port on the switch or try another cable. Connecting via Telnet You can connect to the VH-2402S switch from a remote location using the Telnet application. This application allows you to establish in-band access to the console menus.

  • Page 78: Setting Snmp Management Access

    READ ONLY access to the device via SNMP, whereas the default “Private” community name allows READ/WRITE access. The VH-2402S switch can send SNMP messages called traps to SNMP management stations when an important event occurs with the switch.

  • Page 79: Configuring Port Mirroring

    Connect a traffic analyzer or RMON probe to the mirroring port. Downloading a Software Upgrade You can upgrade the operational software in the VH-2402S switch without physically opening the switch or being in the same location. The software storage sector in the flash memory of the switch is reprogrammable, allowing you to easily download software feature enhancements and problem fixes to the switch from a local or remote location.

  • Page 80: Downloading Via The Serial Port

    Downloading Via the Serial Port A serial download is the easiest method to upgrade the VH-2402S switch software, requiring the least amount of equipment and configuration. To download switch software via the serial port, do the following: With the console port connected, reset the switch by powering the switch off and then on.
  • Page 81 To program the switch IP address, select the Management Setup Menu from the Main Menu screen, then select Network Configuration. To download switch software via TFTP, do the following: Select Download Server IP Address from the TFTP Download Menu.

  • Page 82: Configuring Spanning Tree Parameters

    Configuring Spanning Tree Parameters The VH-2402S switch supports the IEEE 802.1D Spanning Tree Protocol. This protocol allows redundant connections to be created between LAN segments for purposes of fault tolerance. Two or more physical paths between different segments can be created through the switch, with the Spanning Tree Protocol choosing a single path at any given time and disabling all others.

  • Page 83: Configuring Vlans

    During periods of congestion, Class of Service settings ensure that traffic which has been assigned high priority is forwarded through the switch ahead of normal priority traffic. For further information, see Appendix C, “Class of Service”...

  • Page 84: Configuring Port Operation

    Configuring Port Operation You can configure switch ports for operational parameters such as auto- negotiation, duplex mode, port speed and flow control. The 100Base-FX fiber ports always operate in full duplex mode and 100Mbps speed. Therefore, these two parameters, along with auto-negotiation, are not configurable on these fiber ports.

  • Page 85: Configuring The Unicast Address Table

    MAC addresses in the forwarding table: • Dynamic MAC addresses, which are dynamically learned and removed by the switch based on a time period defined using the Aging Time option. • Static MAC addresses, which are entered manually, stored in nonvolatile memory and automatically placed in the address table.

  • Page 86: Setting A Default Gateway

    A BootP server must be operating on the network and be properly configured for this option to work. When this option is enabled, the switch tries to obtain an IP address from the BootP server.

  • Page 87: Configuring Port Trunks

    Configuring Port Trunks You can configure up to five port trunks on a standalone VH-2402S switch, or up to 12 for an entire stack. Each trunk can combine two, three, or four ports, creating an aggregate bandwidth of up to 4Gbps when grouping gigabit ports.
  • Page 88 80 Configuring & Monitoring the Switch VH-2402S...

  • Page 89: Snmp Management

    Managed entities supporting SNMP typically contain software, which runs locally on the device and is referred to as an agent. In Figure 4-1, software in an VH-2402S switch functions as an agent, monitoring and controlling the functionality of the switch.

  • Page 90: Mib Objects

    This operation is typically used as an alert of a potential problem or a change of status with the device. The Trap Destination parameter in the SNMP Configuration Menu is used to configure the IP addresses of the SNMP Manager to which VH-2402S trap messages are sent. MIB Objects A number of standard MIB specifications have been defined for managing network equipment.

  • Page 91: Rfc 1213 (Mib-Ii)

    RFC 1213 provides management of system-level parameters, including TCP/IP protocol-related statistics, IP addressing, and interface statistics for each switch port. MIB-II is the standard MIB defined by RFC 1213. All agent devices operating SNMP are required to support at least part of MIB-II.

  • Page 92: Rfc 1757 (Rmon Mib)

    Compiling MIB Extensions: Enterasys Website The MIBs supported by the VH-2402S switch must be compiled into the SNMP network management platform before the switch can be managed. The supported MIBs are available using Enterasys’s website at: http://www.enterasys.com...

  • Page 93: Appendix A. Spanning Tree Concepts

    Spanning Tree Features The VH-2402S switch meets the requirements of the Spanning Tree Protocol (STP) by performing the following functions: •...

  • Page 94: Spanning Tree Protocol In A Network

    Spanning Tree Protocol in a Network Figure A-1 illustrates the use of three VH-2402S switches to establish an effective Spanning Tree configuration. Switches A, B and C are connected together in a redundant topology (more than one path between two points). If the connection between A and B goes down, the link between A and C becomes active, thereby establishing a path between A and B through switch C.

  • Page 95: Spanning Tree Protocol Parameters

    Several configuration parameters control the operation of the Spanning Tree Protocol. Table A-1 describes the parameters and lists the VH-2402S switch default settings for each parameter. You can cause serious network performance degradation if you do not fully understand Spanning Tree concepts. Be sure to consult personnel experienced with this process prior to configuring Spanning Tree parameters.

  • Page 96: Spanning Tree Protocol Operation

    If there is a change in the network topology due to a failure or the removal or addition of any active components, the active topology also changes. This may trigger a change in the state of some blocked ports. 88 Spanning Tree Concepts VH-2402S...
  • Page 97 There are five (5) states that the ports can be in for spanning tree: • Blocking: A port in this state does not participate in the transmission of frames, thus preventing duplication arising through multiple paths existing in the active topology of the bridged LAN. •...
  • Page 98 90 Spanning Tree Concepts VH-2402S...

  • Page 99: Appendix B. Virtual Lans (Vlans)

    APPENDIX B. VIRTUAL LANS (VLANS) VLANs and Frame Tagging The VH-2402S switch supports IEEE 802.1Q-compliant virtual LANs (VLANs). This capability provides a highly efficient architecture for establishing VLANs within a network and for controlling broadcast/ multicast traffic between workgroups. Central to this capability is an explicit frame tagging approach for carrying VLAN information between interconnected network devices.

  • Page 100: Vh-2402S Vlan Configuration

    VH-2402S VLAN Configuration VLAN operation on the VH-2402S is enabled by default. Therefore, all frames are transferred internally through the switch with a VLAN tag. This tag may already be on the frame entering the switch, or added to the frame by the switch.

  • Page 101: Forwarding Tagged/Untagged Frames

    To forward a frame from a VLAN-aware device to a VLAN-unaware device, the switch first decides where to forward the frame, and then strips off the VLAN tag. However, to forward a frame from a VLAN-unaware device to a VLAN-aware device, the switch first decides where to forward the frame, and then inserts a VLAN tag reflecting this port’s default VID.

  • Page 102: Forwarding Traffic With Unknown Vlan Tags

    Forwarding Traffic with Unknown VLAN Tags This switch only supports 256 VLANs with VLAN IDs ranging from 1 to 2048, but the IEEE 802.1Q VLAN standard allows for VLAN IDs from 1 to 4094. Therefore, if this switch is attached to endstations that issue VLAN registration requests, it will have to forward unknown VLAN tags.

  • Page 103: Appendix C. Class Of Service

    APPENDIX C. CLASS OF SERVICE Class of Service support on the VH-2402S allows you to assign mission- critical data a higher priority through the switch by delaying less critical traffic during periods of congestion. Higher priority traffic through the switch is serviced first before lower priority traffic. The Class of Service capability of the VH-2402S switch is implemented by a priority queuing mechanism.
  • Page 104 Figure C-1 shows priority queuing operating within a switch. Frames entering the switch through ports 1 and 4 are tagged as normal traffic and placed in a normal priority queue on the outbound port. Frames entering through ports 2 and 5 are tagged as high priority traffic and placed in a high priority queue on the outbound port.

  • Page 105: Appendix D. Ip Multicast Filtering

    (VLAN). The VH-2402S, with IP multicast filtering capability, not only passively monitors IGMP Query and Report messages; it can also actively send IGMP Query messages to learn locations of multicast routers/switches and member hosts in multicast groups within each VLAN.
  • Page 107 INDEX address table unicast, 62 aging time, configuring, 77 Auto-negotiation, configuring, 76 BootP, configuring, 78 bridge MIB extensions, 44 Class of Service, configuring, 47, 75 community names, SNMP, 70 console lock-out, 68 console login configuration, 23 console port configuration, 19 connections, 1 modem connection, 2 default settings, 7...
  • Page 108 64 user interface access to, 6 overview, 5 sample, 5 VLAN base information, 49 configuration, 49 current table information, 50 port configuration, 53 static table configuration, 51 VLANs, configuring, 75 Web agent, 1 Web-based management, 1 XMODEM download, 72 VH-2402S...
  • Page 110 150524-103 R02...

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