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3Com SuperStack II 3300 User Manual

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Part No. DUA1696-8AAA02
Published October 1999
SuperStack
Layer 3 Module User Guide
For units in the SuperStack II Switch 1100/3300 family
Switch Agent Software version 2.4 or later and
SuperStack II Switch Layer 3 Module Management Software
version 1.0
II Switch
®

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Summary of Contents for 3Com SuperStack II 3300

  • Page 1 Layer 3 Module User Guide ® For units in the SuperStack II Switch 1100/3300 family Switch Agent Software version 2.4 or later and SuperStack II Switch Layer 3 Module Management Software version 1.0 http://www.3com.com/ Part No. DUA1696-8AAA02 Published October 1999...
  • Page 2 Other brand and product names may be registered trademarks or trademarks of their respective holders. Environmental Statement It is a 3Com policy to be environmentally friendly in all operations. This manual is printed on paper that comes from sustainable, managed European forests. The production process for making the pulp has a reduced AOX level (absorbable organic halogen) resulting in elemental chlorine-free paper.

  • Page 3: Table Of Contents

    ONTENTS BOUT UIDE How to Use This Guide User Guide Conventions Terminology Used in This Guide Related Documentation Feedback about this User Guide Year 2000 Compliance Product Registration NTRODUCING AYER ODULE About the Layer 3 Module Layer 3 Module Software Features Explained WITCHING ONCEPTS AND ETWORK...
  • Page 4 ANAGING THE AYER ODULE Management Methods Accessing the Web Interface Accessing the User Interface Levels of User Access SING THE NTERFACE Web Management Overview Web Management User Interface SNMP ETTING YSTEM ARAMETERS Available SNMP Context Commands Setting Up SNMP on Your System Administering SNMP Trap Reporting Available System Context Commands Displaying the System Configuration...
  • Page 5 EMC Statements ONFIGURATION PPLICATION About the Configuration Application Accessing the Configuration Application Downloading a Software Update Resetting the Module to the Factory Default Values ECHNICAL UPPORT Online Technical Services Support from Your Network Supplier Support from 3Com Returning Products for Repair...
  • Page 6 LOSSARY NDEX ORPORATION IMITED ARRANTY...

  • Page 7: About This Guide

    This user guide and its release notes are available in Adobe Acrobat Reader Portable Document Format (PDF) on the 3Com World Wide Web site: http://www.3com.com/ How to Use This Table 1 shows where to look for specific information in this guide.

  • Page 8: User Guide Conventions

    BOUT UIDE Table 1 Where to find specific information (continued) If you are looking for… Turn to… EMC and technical specifications for the module Appendix A Information on using the Configuration Application Appendix B Technical support information Appendix C User Guide Table 2 and Table 3 list conventions that are used throughout this guide.

  • Page 9: Terminology Used In This Guide

    Matrix Module in a stack of Switches. “OSPF — Anatomy of an Internet Routing Protocol” by John T Moy, Addison Wesley, 1998, ISBN 0-201-63472-4 Web Sites 3Com Web site: http://www.3com.com Internet Engineering Task Force (IETF) information for Request for Comments (RFCs): http://www.ietf.org...

  • Page 10: Feedback About This User Guide

    Do not use this E-mail address for technical support questions. For information about contacting Technical Support, see Appendix C. Year 2000 This product is Year 2000 compliant. For more information on Year 2000 Compliance compliance and 3Com products, visit the 3Com Year 2000 Web page: http://www.3com.com/products/yr2000.html...

  • Page 11: Product Registration

    Product Registration Product You can now register your product online from the 3Com Web site to Registration receive updates and information regarding your product: http://www.3com.com/productreg/pdd...
  • Page 12 BOUT UIDE...

  • Page 13: Introducing The Layer 3 Module

    NTRODUCING AYER ODULE ® This chapter provides a brief overview of the SuperStack II Switch Layer 3 Module, and looks at how it handles routing functionality. It contains the following sections: About the Layer 3 Module Layer 3 Module Software Features Explained About the Layer 3 The SuperStack II Switch Layer 3 Module is an expansion module which Module...

  • Page 14: Layer 3 Module Software Features Explained

    1: I HAPTER NTRODUCING AYER ODULE Internet Group Management Protocol (IGMP) Distance Vector Multicast Routing Protocol (DVMRP) User Datagram Protocol (UDP) helper (BOOTP/DHCP Relay) Several management options: Web-based management Command line interface management SNMP management Layer 3 Module The following sections explain in more detail the software features listed Software Features in “Summary of Software Features”...

  • Page 15: Switching Oncepts And

    WITCHING ONCEPTS AND ETWORK ONFIGURATION XAMPLES This chapter contains basic switching concepts for users that are new to Layer 3 switching. It also sets out some network configuration examples ® for the SuperStack II Switch Layer 3 Module, showing where it can be placed in the network for maximum benefit.
  • Page 16 2: S HAPTER WITCHING ONCEPTS AND ETWORK ONFIGURATION XAMPLES Routing Protocols Routers communicate with each other through protocols that operate at the network layer level. These routing protocols determine whether routing tables are static or dynamic and whether link-state (OSPF) or distance-vector routing (RIP) is used.

  • Page 17: Benefits Of Layer 3 Switches

    Benefits of Layer 3 Switches Static routes are entered manually into the routing table, and are used to reach networks not advertised by routers, for example, if a particular routing policy needs to be enforced. Static routes force traffic to follow a specific path through the network. The network administrator can set up a special static route, called the default route or default gateway.

  • Page 18: Network Configuration Examples

    2: S HAPTER WITCHING ONCEPTS AND ETWORK ONFIGURATION XAMPLES Network The following sections look at different network examples in which the Configuration Layer 3 Module can be used. They show where the module can be placed Examples in flat networks to maximize its effectiveness. Example 1: Simple Figure 1 shows a flat network in which all hosts and servers are attached Flat Network...
  • Page 19 Network Configuration Examples Suggested Deployment of VLANs In Figure 2, the same LAN is divided into two VLANs. Figure 2 Example of VLANs Used in the Simple Network IP Network Address: 192.168.168.128 IP Network Address: 192.168.168.64 Subnet Mask: 255.255.255.192 Subnet Mask: 255.255.255.192 Traffic routed between VLANS Server A in...
  • Page 20 2: S HAPTER WITCHING ONCEPTS AND ETWORK ONFIGURATION XAMPLES Dividing VLANs According to Traffic Requirements For greatest efficiency, make sure that the VLANs are split according to traffic requirements, as shown in Figure 3, which may not necessarily be along functional lines. For example, the heaviest use of your network may be between your servers, with only a small amount of traffic between each of the desktop hosts and the servers.
  • Page 21 Network Configuration Examples Example 2: Large Flat Figure 4 shows a large flat network consisting of a single LAN and no Network VLANs. Figure 4 Flat Network without VLANs IP Network Address: 192.168.168.0 Subnet Mask: 255.255.255.0 Server Workstation Cable Switch A Switch Switch B Switch D...
  • Page 22 2: S HAPTER WITCHING ONCEPTS AND ETWORK ONFIGURATION XAMPLES Deployment of VLANs in a More Complex Network In Figure 5, the Layer 3 Module in Switch D routes packets between VLANs. Figure 5 Complex Network with VLANs IP Network Address: 192.168.168.0 Server Subnet Mask:...
  • Page 23 Network Configuration Examples Addition of Multiple VLANs per Switch In Figure 6, the Switches are connected by 802.1Q tagged links. 802.1Q tagged links are links that use the tagging system defined in the IEEE 802.1Q standard to carry traffic for multiple VLANs. Using the 802.1Q tagged links, the Layer 3 Module can tell Switches A, B and C which VLAN the packets are destined for.
  • Page 24 2: S HAPTER WITCHING ONCEPTS AND ETWORK ONFIGURATION XAMPLES Heavy inter-VLAN Traffic If a particular Switch has a lot of inter-VLAN traffic, you can use a Layer 3 Module in the Switch to route packets between VLANs in one part of the network, as shown in Figure 7.
  • Page 25 Figure 8 Layer 3 Module Used with the SuperStack II Switch Matrix Module Switch stack Layer 3 module Matrix module 3Com does not support more than one Layer 3 Module per stack. Do not install more than one Layer 3 Module in a stack.

  • Page 26: Integrating The Layer 3 Module Into The Network

    2: S HAPTER WITCHING ONCEPTS AND ETWORK ONFIGURATION XAMPLES Integrating the This section outlines the steps you need to take to integrate your Layer 3 Layer 3 Module into Module into a network containing hosts, Layer 2 switches and other the Network routers.

  • Page 27: Installing And Setting U P The Layer 3 Module

    NSTALLING AND ETTING P THE AYER ODULE ® This chapter describes how to install the SuperStack II Switch Layer 3 Module into your Switch. It contains the following sections: Safety Information Device Support Pre-installation Procedure Physical Installation Essential Configuration Factory Default Values Post-installation Checks Safety Information Read the following information before installing the Layer 3 Module.

  • Page 28: Device Support

    Device Support The SuperStack II Switch 1100/3300 family supports the Layer 3 Module. 3Com recommends that you check the Release Notes that accompany the module for information on any additional device support. Pre-installation...

  • Page 29: Physical Installation

    1 Use the Switch software CD if one has been included with your Layer 3 Module. Otherwise, download the latest version of the software from 3Com’s information delivery systems, as described in “Online Technical Services” on page 145. 2 Follow the instructions for upgrading software that are provided in the Switch management guide.

  • Page 30: Essential Configuration

    3: I HAPTER NSTALLING AND ETTING P THE AYER ODULE 4 Slide the module into the slot without touching the top or bottom of the circuit board. Make sure that the module is pushed fully into the unit. 5 Use the thumb screws attached to the module to fix it firmly into place. 6 Power up the Switch as described in “Powering Up the Switch”.
  • Page 31 Essential Configuration IP address on VLAN 1 (the default VLAN). Once the first IP address has been set on the Layer 3 Module, you can manage the module using its own management interfaces. You cannot manage the Layer 3 Module directly from the Switch; you must use Telnet or the Web interface to manage the module.

  • Page 32: Factory Default Values

    3: I HAPTER NSTALLING AND ETTING P THE AYER ODULE b Enter the following: system module define The following prompt is displayed: Enter IP address [0.0.0.0] c Enter the IP address of the Layer 3 Module. Enter Subnet Mask [255.0.0.0] d Enter the Subnet Mask.
  • Page 33 Factory Default Values Table 5 SNMP Default Values SNMP Community Default value read-only public read-write private By default, no SNMP trap destinations are configured. System Default After installation, the default system values are as follows: Values Table 6 System Default Values Parameter Default Value System Name...
  • Page 34 3: I HAPTER NSTALLING AND ETTING P THE AYER ODULE Table 8 Default SNMP Community Passwords Access Level Password read and write private read-only public IP Configuration The following default IP configuration values apply to each module. Default Values Table 9 IP Default Values for Each Module Parameter Default Value arp entries age out after 15 minutes...

  • Page 35: Post-Installation Checks

    Post-installation Checks Table 10 IP Default Values for Each Interface Parameter Default Value OSPF OSPF disabled on each new IP interface Hello timer = 10 seconds* Retransmit = 5 seconds* Dead interval = 40 seconds* Area ID = 0.0.0.0 for each interface No password Interface cost = 1 Priority = 1...
  • Page 36 3: I HAPTER NSTALLING AND ETTING P THE AYER ODULE...

  • Page 37: Managing The Ayer Odule

    Management You can manage the Layer 3 Module in the following ways: Methods Using the Web interface. Using the command line interface (Telnet). Using the 3Com ® Transcend ® Network Control Services software. See your network management documentation for details.
  • Page 38 4: M HAPTER ANAGING THE AYER ODULE Netscape Navigator 4.03 or later 3 In the Location field of the browser, enter the URL of the Layer 3 Module in the following format : http://nnn.nnn.nnn.nnn/ where is the IP address of the module . nnn.nnn.nnn.nnn If you have added the configuration name and IP address of the Layer 3 Module to your Domain Name Server, you can enter the name of the...

  • Page 39: Accessing The User Interface

    From a PC or workstation, to a Layer 3 Module IP address, using Telnet. Through an SNMP-based network management application such as the 3Com Transcend Network Control Services suite of network management tools. Using an IP An IP management interface allows you to manage the system through Management an Ethernet port.
  • Page 40 4: M HAPTER ANAGING THE AYER ODULE The access available at each level is also available by default at higher levels. For example, Read and Write access is available when in Administer mode.

  • Page 41: Using The

    SING THE NTERFACE This chapter contains the following sections: Web Management Overview Web Management User Interface The terms system and module are used interchangeably in the command line and the Web interface. Web Management You use the Web management application to manage a Layer 3 Module Overview from a Web browser.
  • Page 42 5: U HAPTER SING THE NTERFACE Figure 11 Web Management Interface Tabs panel Menu tree Workspace Tabs panel — Located a t the top of your browser window and contains the WebConsole tab. The WebConsole tab displays a menu tree that lists the parameters that you can configure for the selected device.

  • Page 43: Setting Snmp And System Parameters

    SNMP ETTING YSTEM ARAMETERS This chapter contains the following information: Available SNMP Context Commands Setting Up SNMP on Your System Administering SNMP Trap Reporting Available System Context Commands Displaying the System Configuration Installing System Software using TFTP Enabling Timeout of Remote Sessions Setting Passwords Setting the System Name Working with Nonvolatile Data...

  • Page 44: Available Snmp Context Commands

    6: S SNMP HAPTER ETTING YSTEM ARAMETERS Available SNMP Table 13 lists the commands available in the SNMP context. Context Commands Table 13 SNMP Context Commands Command Options Syntax Display current SNMP settings display Set an SNMP community string community Display trap reporting information trap display...
  • Page 45 Setting Up SNMP on Your System Displaying SNMP To display the current module SNMP configurations for community Settings strings, enter the following at the top-level menu: snmp display The following example shows an SNMP settings display: Configuring A community string is an octet string, included in each SNMP message, Community Strings that controls access to system information.

  • Page 46: Administering Snmp Trap Reporting

    6: S SNMP HAPTER ETTING YSTEM ARAMETERS Enter new read-only community [public]: Enter new read-write community [private]: secret You can only change the community strings if you are logged into the user interface as administrator. Administering For network management applications, you can manually administer the SNMP Trap trap reporting address information.
  • Page 47 Administering SNMP Trap Reporting The trap numbers that you enter allow the trap specified by that number to be sent to the destination address when the corresponding event occurs. No unlisted traps are transmitted. If the following message appears: Trap address invalid or unreachable make sure that: The destination address that you entered is a valid end station.

  • Page 48: Available System Context Commands

    6: S SNMP HAPTER ETTING YSTEM ARAMETERS Available System The following commands are available in the system context: Context Commands Table 14 System Context Commands Command Options Syntax Display the configuration of the Layer 3 Module display Initiate a TFTP download of new system software softwareUpgrade Reset nonvolatile data to factory defaults initialize...

  • Page 49: Installing System Software Using Tftp

    Installing System Software using TFTP Installing System To download the Layer 3 Module software using TFTP, follow the Software using procedures in this section. TFTP You can load the system software into flash memory while the Layer 3 Module is operating. You do not need to shut down the system. Before you begin this procedure, make sure that the TFTP server software is running on the device from which you will be installing the software.

  • Page 50: Enabling Timeout Of Remote Sessions

    6: S SNMP HAPTER ETTING YSTEM ARAMETERS Enabling Timeout You can configure the Layer 3 Module to disconnect remote sessions of Remote Sessions after a specified time interval of inactivity. The default Telnet timeout value is disabled. To enable or disable the timeout interval: 1 Enter the following at the top-level menu: system consoleTimeout timeOut The following prompt is displayed:...

  • Page 51: Setting The System Name

    Setting the System Name To change the password: 1 Enter the following at the top-level menu: system password The following prompt is displayed: Password access level (read,write,administer): 2 Enter the required access level. Old password: 3 Enter the old password. New password: 4 Enter the new password.

  • Page 52: Working With Nonvolatile Data

    6: S SNMP HAPTER ETTING YSTEM ARAMETERS Working with Nonvolatile data is information stored by the Layer 3 Module which is Nonvolatile Data retained even when the module is not powered on. You can do the following tasks with nonvolatile data: Create a backup copy of the module’s nonvolatile configuration.
  • Page 53 Working with Nonvolatile Data To back up nonvolatile data, you must first create two files on the TFTP server before you send the data: Control file — Use any filename that is meaningful to you. Example: ctrlfile Nonvolatile data file — Use the control filename plus the .nvd extension.
  • Page 54 6: S SNMP HAPTER ETTING YSTEM ARAMETERS If the save fails, a message appears that is similar to the following example: Saving system...transfer timed out. Error - I/O error while writing nonvolatile data. Do you wish to retry the save using the same parameters? (n,y) [y]. If you enter , the system attempts to save the data as proposed.

  • Page 55: Initializing Data To Factory Defaults

    Initializing Data to Factory Defaults If the saved system ID is the same as the current system ID, the system prompts you with a message that is similar to this one: CAUTION - Restoring nonvolatile data may leave the system in an inconsistent state and therefore a reboot is necessary after each restore.

  • Page 56: Resetting The Module

    6: S SNMP HAPTER ETTING YSTEM ARAMETERS Resetting the If you reboot the module while you are connected through an rlogin or Module Telnet session, rebooting disconnects your session. To reboot the module: 1 Enter the following at the top-level menu: system reset The following prompt is displayed: Are you sure you want to reboot the system? (n,y) [y]:...

  • Page 57: Displaying Vlan Parameters

    VLAN P ISPLAYING ARAMETERS This chapter describes how to display information about VLANs to find what VLAN indexes the Layer 3 Module has created for the 802.1Q VLANs on which it is present. Displaying VLAN The Layer 3 Module learns on which 802.1Q VLANs it is present from the Information host switch.
  • Page 58 7: D VLAN P HAPTER ISPLAYING ARAMETERS The following example shows a VLAN summary display:...

  • Page 59: Setting Ip Parameters

    IP P ETTING ARAMETERS This chapter describes how to configure the IP parameters on your ® SuperStack II Switch Layer 3 Module to allow it to work with your Switch. It contains the following sections: Available IP Commands Administering IP Interfaces Administering Routes Administering the ARP Cache Administering the Domain Name Server Client...

  • Page 60: Available Ip Commands

    8: S IP P HAPTER ETTING ARAMETERS Administering RIP Using ping Using traceRoute See “Accessing the User Interface” on page 39 for information about launching the user interface. Available IP The following commands are available in the IP context: Commands Table 15 IP Context Commands Command Options...
  • Page 61 Available IP Commands Table 15 IP Context Commands (continued) Command Options Sub-options Syntax Display multicast cache entries cacheDisplay Display the current domain name and the display name servers associated with it Modify a currently defined domain name domainName Define a new name server IP address define Modify a name server IP address modify...
  • Page 62 8: S IP P HAPTER ETTING ARAMETERS Table 15 IP Context Commands (continued) Command Options Sub-options Syntax Specify a transit delay delay Specify the hello packet interval on a given hello interface Specify the link state advertisement retransmit retransmit time on a given interface Specify the interface dead interval dead Specify the authentication password for OSPF...

  • Page 63: Administering Ip Interfaces

    Administering IP Interfaces Table 15 IP Context Commands (continued) Command Options Sub-options Syntax Specify the password to be used to generate password the OSPF authentication checksum on virtual link frames Display general OSPF statistics statistics Display the current IP routing configuration display Set the RIP Mode on an interface mode...
  • Page 64 8: S IP P HAPTER ETTING ARAMETERS Advertisement Address — The Layer 3 Module uses this IP address when it advertises routes to other stations on the same subnet. In particular, the Layer 3 Module uses this address for sending RIP updates.
  • Page 65 Administering IP Interfaces Make sure that you define a VLAN, as described in your Switch management guide, before you define an associated IP VLAN interface. To define an IP interface: 1 Enter the following at the top-level menu: ip interface define The following prompt is displayed: Enter IP address: 2 Enter the IP address of the interface.

  • Page 66: Administering Routes

    8: S IP P HAPTER ETTING ARAMETERS Select IP interfaces (2-4|all): 2 Enter the index number of the interface you want to remove. Administering The Layer 3 Module maintains a table of routes to other IP networks, Routes subnets, and hosts. You can make static entries in this table using the command line interface or configure the Layer 3 Module to use a routing information protocol to exchange routing information automatically.
  • Page 67 Administering Routes routes to numerous destinations that all have the same gateway IP address. How Routes are Used The following example shows how the Layer 3 Module uses routes in the by the Layer 3 routing table to forward packets. Module A route in the routing table may contain the following details: Network address of 89.1.0.0...
  • Page 68 8: S IP P HAPTER ETTING ARAMETERS The following example shows a Layer 3 Module’s routing table display: Defining a Static Before you can enter a static route, you must define at least one IP Route interface (see “Defining an IP Interface” on page 64). Static routes remain in the table until you remove them or the corresponding interface.
  • Page 69 Administering Routes 2 Enter the destination IP address of the route. Select subnet mask [255.255.0.0]: 3 Enter the subnet mask of the route. The Layer 3 Module deletes the route from the routing table immediately. Flushing All Learned Flushing deletes all learned routes from the routing table. To flush all Routes learned routes, enter the following at the top-level menu: ip route flush...

  • Page 70: Administering The Arp Cache

    8: S IP P HAPTER ETTING ARAMETERS Administering the The Layer 3 Module uses the Address Resolution Protocol (ARP) to find ARP Cache the MAC addresses corresponding to the IP addresses of hosts and other routers on the same subnets. Each device participating in routing maintains an ARP cache —...
  • Page 71 Administering the ARP Cache Removing an ARP To remove an entry from the ARP cache: Cache Entry 1 Enter the following at the top-level menu: ip arp remove The following prompt is displayed: Select IP address: 2 Enter the IP address of the entry you want to remove. The Layer 3 Module removes the address from the ARP cache immediately.

  • Page 72: Administering The Domain Name Server Client

    8: S IP P HAPTER ETTING ARAMETERS Administering the The Domain Name Server (DNS) client provides DNS lookup functionality Domain Name to the Switch IP ping and traceRoute features. DNS lookup allows you to Server Client specify a hostname rather than an IP address when you use ping or traceRoute to contact an IP station.
  • Page 73 Administering the Domain Name Server Client The following prompt is displayed: Enter Name Server’s IP address: 2 Enter the new name server IP address at the prompt. When the Layer 3 Module accepts the new IP address, it displays a message similar to the following: Server’s IP address 10.0.0.5 is added to the DNS database The Layer 3 Module assigns the new IP address an index number.

  • Page 74: Administering Udp Helper

    8: S IP P HAPTER ETTING ARAMETERS Querying Name You can check the resolution between IP addresses and host names on a Servers Name Server. You enter either the host name or the IP address, and the DNS client displays the pair. To query a name server: 1 Enter the following at the top-level menu: ip dns nslookup...
  • Page 75 Administering UDP Helper The following example shows a UDP Helper display: Defining a Port and You can define port numbers and IP forwarding addresses for the UDP an IP Forwarding Helper. You may have up to 32 combinations of port numbers and IP Address forwarding addresses per router.

  • Page 76: Administering Ip Multicast Routing

    8: S IP P HAPTER ETTING ARAMETERS Setting the BOOTP You can set the maximum hop count for a packet that the Layer 3 Hop Count Limit Module forwards through the router. The default hop count limit is 4. To set the hop count limit: 1 Enter the following at the top-level menu: ip udpHelper hopCountLimit The following prompt is displayed:...
  • Page 77 Administering IP Multicast Routing There are two fundamental types of IPv4 addresses, corresponding to the communication methods: Unicast addresses — Designed to transmit a packet to a single destination. Multicast addresses — Designed to enable the delivery of datagrams to a set of hosts that have been configured as members of a multicast group in various scattered subnetworks.
  • Page 78 8: S IP P HAPTER ETTING ARAMETERS To carry out multicast routing, you must have DVMRP enabled. Doing so enables DVMRP on all active IP interfaces. To enable or disable DVMRP: 1 Enter the following at the top-level menu: ip multicast dvmrp The following prompt is displayed: Enter DVMRP mode (disabled, enabled) [disabled]: 2 Enable or disable DVMRP as required.
  • Page 79 Administering IP Multicast Routing Administering IP The IP multicast interface options allow you to enable and disable Multicast Interfaces multicast characteristics on previously defined IP interfaces. Multicast Interface Characteristics A multicast interface has the following characteristics: DVMRP Metric Value — Determines the cost of a multicast interface.The higher the cost, the less likely it is that the packets will be routed over the interface.

  • Page 80: Administering Multicast Tunnels

    8: S IP P HAPTER ETTING ARAMETERS 2 Enter the index numbers of the interfaces that you want to enable. Enter interface DVMRP metric (1-15): 3 Enter the DVMRP metric value of the chosen interfaces. Enter interface TTL threshold (1-255): 4 Enter the Time To Live (TTL) threshold of the chosen interfaces.
  • Page 81 Administering Multicast Tunnels The following example shows a IP multicast tunnel display: Defining a Multicast To define a multicast tunnel from an interface on the Layer 3 Module: Tunnel 1 Enter the following at the top-level menu: ip multicast tunnel define The following prompt is displayed: Enter an IP interface index [1]: 2 Enter the index numbers of the interfaces with which to associate a...
  • Page 82 8: S IP P HAPTER ETTING ARAMETERS Displaying Routes To display all available routes in the IP multicast routing table, enter the following at the top-level menu: ip multicast routeDisplay The DVMRP status is displayed. The following example shows a multicast route display: Table 17 describes the fields in the cache configuration display.

  • Page 83: Enabling And Disabling Icmp Router Discovery

    Enabling and Disabling ICMP Router Discovery 2 Enter the multicast source address. Enter multicast group address [255.255.255.255]: 3 Enter the multicast group address. The DVMRP status is displayed. Table 18 describes the fields in the multicast cache display. Table 18 Multicast Cache Display Fields Field Description Origin...

  • Page 84: Administering Ospf Areas

    8: S IP P HAPTER ETTING ARAMETERS ICMP Router Discovery is disabled by default. To enable or disable ICMP Router Discovery: 1 Enter the following at the top-level menu: ip icmpRouterDiscovery The following prompt is displayed: Enter router discovery state (disabled,enabled) [disabled]: 2 Enable or disable the ICMP Router Discovery mode as required.
  • Page 85 Administering OSPF Areas Table 19 describes the fields in the areas display: Table 19 Field Attributes for the Areas Display Field Description Indx Entry index for the area AreaID Area identifier IP Address Network portion of IP address range Mask Subnet mask Advertise Should the range be advertised?
  • Page 86 8: S IP P HAPTER ETTING ARAMETERS The following prompt is displayed: Select area {1-2}: 2 Enter the index of the area you want to modify. Enter Area ID [0.0.0.3]: 3 Enter the area ID. Is this a stub area (yes,no) [no]: 4 Specify whether this is a stub area.

  • Page 87: Setting The Default Route Metric

    Setting the Default Route Metric Modifying a Range To modify information associated with a previously defined range: 1 Enter the following at the top-level menu: ip ospf areas modifyRange The following prompt is displayed: Select area {1-2}: 2 Enter the index number of the area that contains the range to modify. Enter IP address of range to modify: 3 Enter the IP address of the range to modify.

  • Page 88: Configuring Ospf Interfaces

    8: S IP P HAPTER ETTING ARAMETERS Displaying the To display the current default route metric value, enter the following at Default Route Metric the top-level menu: ip ospf defaultRouteMetric display The default route metric is displayed: Default route metric = 1 Defining the Default To define a default route metric for the router: Route Metric...
  • Page 89 Configuring OSPF Interfaces Displaying OSPF To display information about the module’s OSPF interface configuration, Interface Information enter the following at the top-level menu: ip ospf interface summary ip ospf interface detail The following example shows an OSPF detail display: Table 20 describes the OSPF interface display field attributes: Table 20 Field Attributes for the OSPF Interface Displays Field Description...

  • Page 90: Interface Statistics

    8: S IP P HAPTER ETTING ARAMETERS Table 20 Field Attributes for the OSPF Interface Displays (continued) Field Description State Interface state: Disabled= OSPF is not enabled on the interface. Down= The interface is down, but OSPF is enabled on it. Loopback= The interface is a loopback interface.
  • Page 91 Configuring OSPF Interfaces The following example shows an OSPF interface statistics display: Table 21 describes the interface statistics display attributes: Table 21 Field Attributes for Interface Statistics Display Field Description receiveHello Number of hello packets received transmitHello Number of hello packets transmitted receiveDD Number of database description packets received transmitDD...
  • Page 92 8: S IP P HAPTER ETTING ARAMETERS Table 21 Field Attributes for Interface Statistics Display (continued) Field Description mismatchHello Number of hello packet interval mismatches detected mismatchDead Number of router dead interval mismatches detected mismatchMask Number of subnet mask mismatches detected mismatchAreaID Number of interface area ID mismatches detected mismatchAreaType Number of interface area type mismatches detected...
  • Page 93 Configuring OSPF Interfaces The default priority value is 1. To set the interface priority: 1 Enter the following at the top-level menu: ip ospf interface priority The following prompt is displayed: Select IP interfaces (1-2|all): 2 Enter an IP interface. Enter priority (0-255) [1]: 3 Enter the priority value.
  • Page 94 8: S IP P HAPTER ETTING ARAMETERS 2 Enter an IP interface number. Enter cost (1-65535) [1]: 3 Enter the cost value for the interface. The default is calculated by the Layer 3 Module. Setting the Delay This command sets the OSPF interface transmit delay. The Layer 3 Module adds the value of the transmit delay to all link state advertisements (LSAs) that it sends out to the network.
  • Page 95 Configuring OSPF Interfaces The following prompt is displayed: Select IP interfaces (1-2|all): 2 Enter an IP interface. Enter Hello packet interval (1-65535) [10]: 3 Enter the hello timer value, in seconds. Setting the You can specify the OSPF link state advertisement (LSA) retransmit Retransmit Timer interval for each interface.

  • Page 96: Displaying The Link State Database

    8: S IP P HAPTER ETTING ARAMETERS 2 Enter an IP interface number. Enter dead interval (1-65535) [40]: 3 Enter the value of the dead interval, in seconds. Setting the Password This command allows you to set a security password for a specific OSPF interface.
  • Page 97 Displaying the Link State Database An asterisk ( ) after the router ID in a display indicates that the LSA originated locally. Displaying a This display summarizes all LSAs in the link state database. To display the Database Summary database summary: 1 Enter the following at the top-level menu: ip ospf linkStateData databaseSummary The following prompt is displayed:...
  • Page 98 8: S IP P HAPTER ETTING ARAMETERS The following prompt is displayed: Enter Area ID [0.0.0.0]: 2 Enter the area ID. Enter Area mask [0.0.0.0]: 3 Enter the area subnet mask. Enter LSID [0.0.0.0]: 4 Enter the LSID. Enter LSID mask [0.0.0.0]: 5 Enter the LSID mask.
  • Page 99 Displaying the Link State Database Table 23 Field Attributes for Link State Database Router Display (continued) Field Description Link Data PTP= MIB II index value for an unnumbered point-to-point interface Transit= IP interface address of designated router Stub= Network IP address mask Virtual link= IP interface address of neighboring router Metric Cost of the link...
  • Page 100 8: S IP P HAPTER ETTING ARAMETERS Table 24 Field Attributes for Link State Database Network Display Field Description Network Mask IP address mask for the network. Attached Routers List of routers that are fully adjacent to the designated router (DR).
  • Page 101 Displaying the Link State Database Table 25 Field Attributes for Link State Database Network Summary Display Field Description LS Seq Sequence number of the LSA (used to detect older duplicate LSAs) LS Age Time in seconds since LSA was originated Network Mask Type 3= destination network’s IP address mask Type 4= this type is not used, must be 0...

  • Page 102: Administering Neighbors

    8: S IP P HAPTER ETTING ARAMETERS Table 26 Field Attributes for the Link State Database External Display Field Description Type Type 1= normal link state metric Type 2= metric is larger than any local link state path RouteTag Not used by OSPF, these 32 bits may be used to communicate other information between boundary routers.
  • Page 103 Administering Neighbors Table 27 Field Attributes for Neighbors Display (continued) Field Description State Neighbor’s adjacency: Down= No recent data received from neighbor, connection is down Attempt= Only used on non-broadcast networks. No recent data received from neighbor (will attempt to contact) Init= Have recently seen hello packet from neighbor, however two-way communication has not been established Two-way= Bidirectional communication has been established...

  • Page 104: Setting The Ospf Router Id

    8: S IP P HAPTER ETTING ARAMETERS Adding a Neighbor You can add a neighbor static IP address to an existing interface. This may speed up the process of router convergence. To add a neighbor: 1 Enter the following at the top-level menu: ip ospf neighbors add The following prompt is displayed: Select IP interface {1-4} [3]:...

  • Page 105: Administering Memory Partitions

    Administering Memory Partitions The router ID must be unique for every router for OSPF to operate correctly. To make sure that the router ID is unique, choose the default setting. The default setting uses the Layer 3 Module ID, which is unique to each Layer 3 Module.
  • Page 106 8: S IP P HAPTER ETTING ARAMETERS The following example shows an OSPF memory partition summary display: This display shows three partition parameters: Current partition maximum size ( in this example) — 500000 The OSPF memory limit implemented at the last system reboot. Configured partition maximum size ( in this example) —...

  • Page 107: Administering The Stub Default Metric

    Administering the Stub Default Metric Administering the The stub default metric value determines if the router will generate the Stub Default Metric default route into the stub areas of the network. This value applies to area border routers (ABRs) that have attached stub areas. Displaying the Stub To display the current stub default metric value, enter the following at the Default Metric...
  • Page 108 8: S IP P HAPTER ETTING ARAMETERS When an ABR is connected to the backbone and provides access to the other ABRs that do not have access to the network When you define a virtual link, you specify the Transit Area ID and the Target Router ID.
  • Page 109 Administering Virtual Links The following example shows a detailed display: Table 29 describes the virtual links display fields: Table 29 Field Attributes for Virtual Links Display Field Description Indx Index of the local interface that the virtual link is connected to Interface Address Local interface address Router ID Remote router’s OSPF router ID...
  • Page 110 8: S IP P HAPTER ETTING ARAMETERS The following example shows a virtual link statistics display: Defining a You must configure a virtual link for each area border router that has an Virtual Link interface outside the backbone area. You can define up to 32 virtual links per Layer 3 Module. To define a virtual link: 1 Enter the following at the top-level menu: ip ospf virtualLinks define...
  • Page 111 Administering Virtual Links The following prompt is displayed: Select virtual link (1-2|all): 2 Specify the virtual link(s) you want to remove. Modifying an AreaID To modify the area ID of the transit area associated with the virtual link: 1 Enter the following at the top-level menu: ip ospf virtualLinks areaID The following prompt is displayed: Select virtual link (1-2|all):...
  • Page 112 8: S IP P HAPTER ETTING ARAMETERS 2 Enter the virtual link ID. Enter transmit delay (1-65535) [1]: 3 Enter the value of the transmit delay. Setting the Hello The hello timer determines how often the virtual link transmits hello Timer packets to neighbor routers on the network.

  • Page 113: Displaying Ospf General Statistics

    Displaying OSPF General Statistics Modify the Dead You can modify the virtual link dead interval. Interval The default dead interval is 40 seconds. To modify the dead interval: 1 Enter the following at the top-level menu: ip ospf virtualLinks dead The following prompt is displayed: Select virtual link (1-2|all): 2 Enter the virtual link ID.

  • Page 114: Administering Rip

    8: S IP P HAPTER ETTING ARAMETERS The following example shows an OSPF statistics display: Table 30 describes OSPF statistics display fields: Table 30 Field Attributes for OSPF Statistics Display Field Description SPFComputations Number of shortest-path-first computations done memoryFailures Number of nonfatal memory-allocation failures LSAsTransmitted Number of link state advertisements transmitted extLsaChanges...
  • Page 115 Administering RIP An active router sends a RIP message every 30 seconds. This message contains both the IP address and a metric (the distance to the destination from that router) for each destination. In RIP, each router that a packet must travel through to reach a destination equals one hop.
  • Page 116 8: S IP P HAPTER ETTING ARAMETERS 2 Select the interface you require. Interface 2 - Enter RIP mode (disabled,learn,advertise,enabled) [enabled]: 3 Enter the RIP mode as required. Enabling and When the Poisoned Reverse mode is enabled, RIP does the following: Disabling Poisoned Advertises route updates it receives back through the receiving Reverse...
  • Page 117 Administering RIP 2 Enter the IP interface index number , or specify ? to get a list of the selectable IP interface indexes. Interface 1 - Enter advertisement address: 3 Enter an advertisement address. You can specify up to 64 advertisement addresses in separate iterations.

  • Page 118: Using Ping

    8: S IP P HAPTER ETTING ARAMETERS Setting the Cost You can set the RIP cost option. The default cost value is 1, which is appropriate for most networks. To set the RIP cost: 1 Enter the following at the top-level menu: ip rip cost The following prompt is displayed: Select IP interfaces (1-4|all) [2]:...
  • Page 119 Using ping The following are possible responses to a ping: If the host is reachable, the Layer 3 Module displays information about the ICMP reply packets and the response time to the ping. The amount of information depends on whether the quiet option is enabled or disabled.
  • Page 120 8: S IP P HAPTER ETTING ARAMETERS Table 31 Default Values for Ping Options Option Default Value count 3 packets wait 1 second packetSize 64 bytes quiet disabled burst disabled sourceAddress determined by the router Using the Use the command to ping a host with one or more of ip advancedPing advancedPing the advanced ping options.
  • Page 121 Using ping Table 32 Advanced Ping Options (continued) Option Description burst When this option is enabled, the system sends out the ICMP echo request packets as rapidly as possible. When this option is enabled, it overrides the values set for the quiet option and for the wait option.
  • Page 122 8: S IP P HAPTER ETTING ARAMETERS 8 If you have more than one interface defined, you can select a particular ICMP source IP address ( ). The default is 9 Enter the index number of the ICMP source IP address that you want to use or enter ? to list the index values.

  • Page 123: Using Traceroute

    Using traceRoute Using traceRoute The traceRoute feature allows you to track the route of an IP packet through the network. TraceRoute information includes all the nodes in the network that a packet passes through to get from its origin to its destination.
  • Page 124 8: S IP P HAPTER ETTING ARAMETERS Using the traceRoute Use the ip traceRoute command to trace a route to a destination using Command the default traceRoute options (see Table 33 on page 125). To change the default traceRoute options, use the command and advancedTraceroute press [Enter] until you see the prompt for the option you want to change.
  • Page 125 Using traceRoute Table 33 lists the default values for the traceRoute options: Table 33 Default Values for traceRoute Options Option Default Value 30 hops port port 33434 probeCount 3 probes wait 3 seconds packetSize 28 bytes sourceAddress determined by the router numeric disabled Using the...
  • Page 126 8: S IP P HAPTER ETTING ARAMETERS Table 34 Advanced traceRoute options (continued) Option Description sourceAddress Use this option to specify a source address other than the one from which the probe packets originate. This option is available if you have more than one IP interface defined on your system.
  • Page 127 Using traceRoute The following example shows a successful advanced traceRoute command, specifying a TTL value of 10: Select menu options (ip): advancedTraceRoute Enter host name/IP address [0.0.0.0]: 10.0.1.2 Enter maximum Time-to-Live (ttl) (1-255 [30]: 10 Enter Destination Port number (30000-65535) [33434]: Enter the number of probes to be sent at each ttl level (1-10) [3]: Enter time (sec) to wait for a response (1-10) [3]...
  • Page 128 8: S IP P HAPTER ETTING ARAMETERS...

  • Page 129: Problem Solving

    Use this section when you do not know the cause of the problem. If you have problems that are not addressed by the problem solving information in this guide, contact 3Com Technical Support, or your service personnel. See Appendix C for information about contacting Technical Support.
  • Page 130 ON position. 3 Replace the power cable with a cable known to be working, and power-up the Switch. 4 Contact 3Com Technical Support. See Appendix C. Layer 3 Module is not correctly Remove and then reinstall the Layer installed.
  • Page 131 Identifying the Problem Table 36 Identifying Problems with the Layer 3 Module (continued) Problem Cause Solution The module status LED on the front Switch software version in your Upgrade the Switch software to a panel of the Switch flashes slowly Switch does not support the Layer 3 version that supports the Layer 3 when the Layer 3 Module is...
  • Page 132 9: P HAPTER ROBLEM OLVING Table 36 Identifying Problems with the Layer 3 Module (continued) Problem Cause Solution Cannot ping or Telnet to the Layer Switch or stack does not have an IP Configure the Switch, or stack, that 3 Module VLAN 1 IP address. address.
  • Page 133 Main application image has become Obtain the main application If you Telnet to the Layer 3 Module corrupted; for example, because a software image from the 3Com VLAN 1 IP address, you can see the software upgrade was interrupted. Web site. To reinstall the...
  • Page 134 Main application image has become Obtain the main application 3 Module from hosts on VLAN 1, corrupted, and the module is software image from the 3Com but not from any of the hosts on running the Configuration Web site. To reinstall the other VLANs.
  • Page 135 Identifying the Problem Table 36 Identifying Problems with the Layer 3 Module (continued) Problem Cause Solution You have configured a multicast Check the IP addresses of the tunnel, but multicast traffic is not routers at both ends of the being routed through it. multicast tunnel.
  • Page 136 9: P HAPTER ROBLEM OLVING Table 36 Identifying Problems with the Layer 3 Module (continued) Problem Cause Solution If RIP is the routing protocol and Layer 3 Module supports RIP version Where you have subnets, try one of you are using variable length subnet the following procedures: masks of class A, B or C network RIP version 1 does not support the...
  • Page 137 IGMP (RFC 1112) OSPF Protocol Analysis (RFC 1245) Requirements for IP Version 4 routers (RFC 1812) Year 2000 Compliance This product is Year 2000 compliant. For information on Year 2000 Compliance and 3Com products, visit the 3Com Year 2000 Web page: http://www.3Com.com/products/yr2000.html...

  • Page 138: Module Technical Specifications

    A: L PPENDIX AYER ODULE ECHNICAL PECIFICATIONS EMC Statements FCC Statement: 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 139: B Configuration Application

    ONFIGURATION PPLICATION This appendix contains the following sections: About the Configuration Application Accessing the Configuration Application Downloading a Software Update Resetting the Module to the Factory Default Values About the The Configuration Application is an additional application provided with Configuration the Layer 3 Module boot code.

  • Page 140: Downloading A Software Update

    B: C PPENDIX ONFIGURATION PPLICATION 5 Continue to hold in the configuration switch until the front panel link status LEDs have lit up. This is usually about 10 seconds after you power up the Switch. 6 Release the configuration switch. 7 Telnet to the Layer 3 Module IP address from any host on VLAN 1.
  • Page 141 Downloading a Software Update Figure 13 Download Software Update Menu To download a new application image, you need to have a TFTP server installed on VLAN 1. The application image that you want to download must be installed on this TFTP server. 1 Enter and the IP address of the TFTP server.
  • Page 142 B: C PPENDIX ONFIGURATION PPLICATION Figure 14 Download Software Update Menu with IP Address and Filename 3 Enter to download the application image and load it into the non-volatile storage on the Layer 3 Module. The following prompt is displayed: Enter one of: 1 2 3 4 0? 3 Starting tftp download.

  • Page 143: Resetting The Module To The Factory Default Values

    Applying software update......Download operation completed successfully. Press RETURN key to continue The application image has now been downloaded. Option 4 is provided for 3Com support purposes only. 4 Enter to return to the Configuration Application Menu Display. Restarting the...
  • Page 144 B: C PPENDIX ONFIGURATION PPLICATION...

  • Page 145: Support

    3Com recommends that you access the 3Com Corporation World Wide Web site. Online Technical 3Com offers worldwide product support 24 hours a day, 7 days a week, Services through the following online systems: World Wide Web site...
  • Page 146 3Com FTP Site Download drivers, patches, software, and MIBs across the Internet from the 3Com public FTP site. This service is available 24 hours a day, 7 days a week. To connect to the 3Com FTP site, enter the following information into...

  • Page 147: Support From Your Network Supplier

    3Com. Support from 3Com If you are unable to obtain assistance from the 3Com online technical resources or from your network supplier, 3Com offers technical telephone support services. To find out more about your support options, please call the 3Com technical telephone support phone number at the location nearest you.
  • Page 148 0800 13 3266 Peru AT&T +800 666 5065 Chile 1230 020 0645 Puerto Rico 800 666 5065 Colombia 98012 2127 Venezuela AT&T +800 666 5065 North America 1 800 NET 3Com (1 800 638 3266) Enterprise Customers: 1 800 876 3266...

  • Page 149: Returning Products For Repair

    Returning Products for Repair Returning Products Before you send a product directly to 3Com for repair, you must first for Repair obtain a Return Materials Authorization (RMA) number. Products sent to 3Com without RMA numbers will be returned to the sender unopened, at the sender’s expense.
  • Page 150 C: T PPENDIX ECHNICAL UPPORT...
  • Page 151 LOSSARY 802.1p and 802.1Q 802.1p and 802.1Q are IEEE standards that have been developed to address the problems of multimedia traffic delivery and VLAN partitioning across a bridged network. Area Border Router — a border router for an OSPF area. An ABR is located on the border of one or more OSPF areas that connects those areas to the backbone network.
  • Page 152 LOSSARY backbone area A special OSPF Area 0 (often written as Area 0.0.0.0, since OSPF Area IDs are typically formatted as IP addresses). The OSPF backbone always contains all area border routers. The backbone is responsible for distributing routing information between non-backbone areas. backbone router A backbone router only has interfaces in the OSPF backbone area.
  • Page 153 LOSSARY DVMRP Distance Vector Multicast Routing Protocol — DVMRP (RFC 1075) is an Internet routing protocol that provides multicast routing. It supports IP multicast routing by broadcasting data to each router in an internetwork when users join or leave multicast groups. dynamic route Dynamic routes are IP routes learned using a routing information protocol, such as OSPF or RIP.
  • Page 154 LOSSARY ICMP Internet Control Message Protocol (RFC 792) — ICMP allows hosts to find the routers attached to their segments and provides certain diagnostic capabilities to the hosts when the routers are unable to deliver packets to addressed destinations. IEEE Institute of Electrical and Electronics Engineers —...
  • Page 155 LOSSARY Layer 3 The network layer in the OSI 7-layer model. This layer controls communication links and data routing across one or more links. It receives data that has been framed by the Data Link layer below it, converts this data into packets, and passes the result to the Transport layer that directs the packets to their destination.
  • Page 156 LOSSARY OSPF Open Shortest Path First — OSPFv1 (RFC 1245) is an alternative to RIP that overcomes many of its limitations; limited network size, slow to stabilize and network traffic load. OSPFv1 in the Layer 3 Module supports 32 areas, 32 virtual links and 64 neighbors. OSPF area An OSPF area is a logical, user-defined group of networks, hosts, and directly attached routers.
  • Page 157 LOSSARY switch A device which filters, forwards and floods packets based on the packet’s destination address. The switch learns the addresses associated with each switch port and builds tables based on this information to be used for the switching decision. A layered set of communications protocols providing Telnet terminal emulation, FTP file transfer, and other services for communication among a wide range of computer equipment.
  • Page 158 LOSSARY virtual link Virtual Links provide connections to those areas in the OSPF autonomous system that are not directly connected to the backbone. VLAN Virtual Local Area Network — a group of location and topology independent devices that communicate as if they are on the same physical LAN.
  • Page 159 71 allocating memory for OSPF 106 area IDs Numerics modifying for virtual links 111 3Com bulletin board service (3Com BBS) 146 OSPF areas 85 3Com Knowledgebase Web Services 145 OSPF interfaces 93 3Com URL 145 3ComFacts 146 administering ARP cache 70 802.1Q tagged links 23...
  • Page 160 NDEX virtual link target routers 111 ip ospf interface mode 92 virtual link transmit delay 111 ip ospf interface retransmit 95 characteristics ip ospf interface statistics 90 IP interfaces 63 ip ospf interface summary 89 IP multicast interfaces 79 ip ospf linkStateData databaseSummary 97 OSPF area 85 ip ospf linkStateData external 101 routing table entries 66...
  • Page 161 NDEX snmp trap flush 47 ping 119 snmp trap remove 47 resetting for NV data 55, 143 system consoleTimeout timeOut 50 route metric 87 system display 48 SNMP 32 system initialize 55 system 33 system name 51 system console timeout 50 system nvData restore 54 traceRoute 125 system nvData save 53...
  • Page 162 NDEX external network LSAs 101 ICMP router discovery 83 IP interface summaries 64 IGMP 78 IP multicast interfaces 79 IP multicast routing 79 IP multicast tunnels 80 multicast interfaces 79 link state database summary 97 OSPF interface mode 92 multicast cache 82 poisoned reverse mode 116 multicast routes 82 remote session timeout 50...
  • Page 163 NDEX Internet Control Message Protocol. See ICMP interface summary 64 Internet Group Management Protocol. See IGMP multicast cacheDisplay 82 Internet Protocol. See IP multicast dvmrp 78 interpreting LEDs 130 multicast igmp 78 multicast interface disable 80 time-to-live 123 multicast interface display 79 IP addresses multicast interface enable 79 assigning 31...
  • Page 164 NDEX ospf virtualLinks router 111 contacting from VLANs 134 ospf virtualLinks statistics 109 contacting IP address 131 ospf virtualLinks summary 108 downloading software using TFTP 49 ping 119 essential configuration 30 rip addAdvertisement 116 handling 28 rip cost 118 hardware features 13 rip display 115 in switch stacks 24 rip mode 115...
  • Page 165 NDEX maximum hop count resetting default values 55, 143 BOOTP 76 restoring 54 memory saving 52 OSPF usage 105 transferring 52 MIBs 146 modes poisoned reverse 116 online technical services 145 RIP 115 Open Shortest Path First protocol. See OSPF modifying OSI reference model 15 DNS domain names 72...
  • Page 166 NDEX disabling the mode 92 commands 118 displaying 89 count 120 enabling the mode 92 default values 119 hello timer 94 packet size 120 mode 92 quiet 120 password 96 responses 119 priority 92 source address 121 retransmit timer 95 wait 120 statistics 90 poisoned reverse...
  • Page 167 NDEX routes 68 removing the default 69 stub default metric 107 setting default 69 trap reporting destinations 47 static 17 UDP helper forwarding address 75 routing UDP helper port numbers 75 multicast 14, 76 virtual links 110 protocols 16 resetting unicast 14 NV data default values 55, 143 Routing Information Protocol.
  • Page 168 48 modifying for virtual links 111 switch version 13, 28 technical support upgrade 28, 140 3Com Knowledgebase Web Services 145 source address ping command 121 3Com URL 145 traceRoute command 126 bulletin board service 146...
  • Page 169 NDEX traceRoute removing forwarding addresses 75 advanced options 125 removing port numbers 75 commands 123 setting BOOTP hop count limit 76 default values 125 setting BOOTP relay threshold 76 numeric format 125, 126 unicast addresses 77 packet size 125 Uniform Resource Locator. See URL port 125 upgrading probe count 125...
  • Page 170 NDEX menu tree 42 overview 41 tabs panel 42 workspace 42 World Wide Web (WWW) 145 Year 2000 compliance 137...
  • Page 171 3Com’s Web site, http://www.3com.com/products/yr2000.html, as not meeting this standard. A product is considered a “Heritage 3Com product” if it is a member of a product family which was manufactured by 3Com prior to its merger with US Robotics Corporation. This Year 2000 limited warranty does not apply to Heritage US Robotics Corporation products.
  • Page 172 Please refer to the Technical Support Appendix in the User Guide for telephone numbers. Response to requests for telephone technical support will be in the form of a return call from a 3Com representative by close of business on the following business day.

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