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Catalyst 6000 Family MSM Install/Config Note

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Table of Contents

Catalyst 6000 and 6500 Series
Multilayer Switch Module
Installation and Configuration Note
 Software Requirements
 Contents
 Features
 Front Panel Description
 Functional Description
 MAC Addresses
 Hot Swapping
 Power Management
 Environmental Monitoring
 Selecting a Network Management IP Address
 MSM Handling of Access Lists
 Multilayer Switching (MLS) Support on the MSM
 Installing the Multilayer Switch Module
 Booting the Multilayer Switch Module for the First Time
 Basic Router Configuration Tasks
 Configuring the Multilayer Switch Module for InterVLAN Routing
 Switch C Configuration
 Configuring the IP Routing Protocols
 Configuring Novell's IPX Protocol
 Configuring IP Multicast Routing
 Configuring Bridging
 Configuring Integrated Routing and Bridging
 Configuring Quality of Service Mechanisms
 Recovering a System Image Using Xmodem or Ymodem
 Performing General Startup Tasks
 Software Configuration Register Settings
 Maintenance Procedures
 Regulatory Standards Compliance
 Related Documentation
 Cisco Connection Online
 Documentation CD-ROM

Catalyst 6000 and 6500 Series
Multilayer Switch Module
Installation and Configuration Note

Product Number: WS-X6302-MSM

This publication contains the procedures for installing and configuring the Catalyst 6000 family Multilayer Switch Module (MSM). The procedures are arranged in the order that they should be performed. Hardware installation begins in the "Installing the Multilayer Switch Module" section. However, we recommend that you review the prior sections to get an understanding of the MSM.

Software Requirements

  • Catalyst 6000 family supervisor engine software version 5.2(1)CSX or later
  • Cisco IOS version 12.0(1a)WX5(6d) or later

Contents

This publication consists of the following sections:

Features

The Multilayer Switch Module (MSM) provides multiprotocol routing for the Catalyst switch Ethernet interfaces. Table 1 lists the Cisco IOS features available for the MSM.

Table 1   Cisco IOS Features

Layer 3 Forwarding Features

Wire speed IP, IP multicast, and IPX routing between VLANs

Support for up to 64K entries for IP network prefixes, IP unicast and multicast addresses, IPX network numbers, and MAC addresses

IP precedence-based IP forwarding

FIB1 and adjacency database support as defined in other Cisco routers

Destination or destination/source-based load sharing among equal cost paths
Layer 3 Routing Protocols

Static IP routing

IP routing protocols: IGRP2, EIGRP3, OSPF4, RIP5, and RIP-2

IP multicast routing protocols: PIM6 (sparse and dense mode) and DVMRP7

IPX routing protocols: RIP and EIGRP
Layer 3 Related Protocols

IGMP8 v1 and v2

IGMP snooping

CGMP9 server support

Full ICMP10 support

GDP11

IRDP12
Enhanced Services

IRB13

Standard DNS14 support

DHCP15 and BOOTP16 relay

M-HSRP17

CDP18
Layer 3 QOS19 Related Features

Four priority queues for COS20-based operation

IP precedence to VC21/queue mapping
1FIB = forwarding information base

2IGRP = Interior Gateway Routing Protocol

3EIGRP = Enhanced Interior Gateway Routing Protocol

4OSPF = Open Shortest Path First

5RIP = Routing Information Protocol

6PIM = Protocol Independent Multicast

7DVMRP = Distance Vector Multicast Routing Protocol

8IGMP = Internet Group Management Protocol

9CGMP = Cisco Group Multicast Protocol

10ICMP = Internet Control Message Protocol

11GDP = Gateway Discovery Protocol

12IRDP = ICMP Router Discovery Protocol

13IRB = Integrated Routing and Bridging

14DNS = Domain Naming System

15DHCP = Dynamic Host Configuration Protocol

16BOOTP = Boot Protocol

17M-HSRP = Multiple-Hot Standby Routing Protocol

18CDP = Cisco Discovery Protocol

19QOS = Quality of Service

20COS = Class of Service

21VC = virtual circuit

Front Panel Description

The MSM front panel features are shown in Figure 1 and are described in the following sections.


Figure 1   Multilayer Switch Module

Status LED

When the MSM is powered up, it initializes various hardware components and communicates with the supervisor engine. The Status LED shows the results of the initialization and its dialogue with the supervisor engine, as described in Table 2.

Note      For detailed information on the supervisor engine LEDs, refer to the Catalyst 6000 and 6500 Series Supervisor Engine Installation Guide.

Table 2  

LED Color/Description

STATUS

The Status LED shows module status as follows:

  • Normal initialization sequence

Off—Module waiting for the supervisor engine to grant power

Red—Module is released from reset by the supervisor engine and is booting

Orange—Module is initializing hardware or communicating with the supervisor engine

Green—Module is operational; supervisor engine has granted module online status

  • Fault during initialization sequence1

The Status LED might indicate the following fault conditions:

    • If the boot code fails to execute, the LED stays red after power up.
    • If the module fails to download its Field Programmable Gate Arrays (FPGAs) on power up, it still proceeds with the rest of the initialization sequence and is granted module online status from the supervisor engine, but the LED stays orange.
    • If the module is not granted module online status from the supervisor engine, the LED stays orange. This could be caused by the supervisor engine detecting a failure in an external loopback test that it issued to the MSM.
  • Module disabled through the supervisor engine CLI2 (set module disable mod_num)

The LED goes from green to orange; the module is not online

  • Break issued

During a Telnet session, if the MSM console receives a break through a send brk command and the configuration register is set to not ignore break (bit 8 set to 0), upon break the ROM monitor takes control of the system and the LED goes to orange until a continue command is issued to the ROM monitor. At that time, the software continues to execute and the LED is restored to its original setting before the break was issued.

  • Environmental monitoring3

Orange—Overtemperature condition (minor threshold exceeded)

Red—Overtemperature condition (major threshold exceeded)

  • Status LED off

Module not receiving power. This could be caused by the following:

  • Module was powered down due to lack of power (module listed as power-deny in the show module status field)
  • Module reports an overtemperature condition (major alarm threshold exceeded)
1If the module is listed by the supervisor engine as faulty in the show module status field, enter the show test mod_num command to see the details of any test failure.

2CLI = command-line interface.

3Enter the show temperature command from the MSM router prompt to display current temperature, major and minor thresholds, and the number of alarms that have occurred since the last system boot. Enter the show environment temperature mod_num command from the Catalyst switch prompt to display the temperature of each of four sensors on the MSM.

MSM Status LED

Console Port Mode Switch

The console port mode switch allows you to connect a terminal to the MSM using either a
Catalyst 5000 series Supervisor Engine III console cable or the console cable and adapters provided with a Catalyst 6000 family switch. Additionally, you can connect a modem to the console port using the cable and adapter provided with the switch.

Use the port mode switch as follows:

Note      Use a paper clip or a small, pointed object to access the port mode switch.

  • Mode 1—Switch in the in position (factory default position) to connect a terminal to the console port using the console cable and data terminal equipment (DTE) adapter (labeled "Terminal") that shipped with the switch.

You can also use this mode to connect a modem to the console port using the console cable and data communications equipment (DCE) adapter (labeled "Modem") that shipped with the switch.

  • Mode 2—Switch in the out position to connect a terminal to the console port using the
    Catalyst 5000 series Supervisor Engine III console cable (not provided).

Console Port

Note      You should not have to connect a terminal to the MSM console port. When your terminal is connected to the supervisor engine console port, use the session command to access the MSM for router configuration.

The console port allows you to access the MSM either locally (with a console terminal) or remotely (with a modem). The console port is an EIA/TIA-232 asynchronous, serial connection with an RJ-45 connector.

Note      EIA/TIA-232 and EIA/TIA-449 were known as recommended standards RS-232 and RS-449 before their acceptance as standards by the Electronic Industries Association (EIA) and Telecommunications Industry Association (TIA).

Note      The accessory kit that shipped with your Catalyst 6000 family switch contains the cable and adapters to connect a terminal or modem to the console port. These cables and adapters are the same as those shipped with the Cisco 2500 series routers and other Cisco products.

Note      For complete console port cabling specifications and pinouts, refer to the Catalyst 6000 and 6500 Series Supervisor Engine Installation Guide.

Connecting a Terminal

To connect a terminal to the console port using the cable and adapters provided with the
Catalyst 6000 family switch, ensure that the console port mode switch is in the in position (factory default position). Connect to the port using the RJ-45-to-RJ-45 cable and RJ-45-to-DB-25 DTE adapter or RJ-45-to-DB-9 DTE adapter (labeled "Terminal").

To connect a terminal using a Catalyst 5000 series Supervisor Engine III console cable, place the console port mode switch in the out position. Connect to the port using the Catalyst 5000 series Supervisor Engine III cable and the appropriate adapter for the terminal connection.

Check the documentation that came with your terminal to determine the baud rate. The baud rate of the terminal must match the default baud rate (9600 baud) of the console port. Set up the terminal as follows:

  • 9600 baud
  • 8 data bits
  • No parity
  • 1 stop bit
  • No flow control

Connecting a Modem

To connect a modem to the console port, ensure that the console port mode switch is in the in position (factory default position). Connect the modem to the port using the RJ-45-to-RJ-45 cable and the RJ-45-to-DB-25 DCE adapter (labeled "Modem").

Functional Description

This section describes the basic operation of the MSM and introduces concepts necessary to configure the MSM.

The MSM runs Cisco IOS router software that directly interfaces to (plugs into) the switch backplane to provide Layer 3 switching (see Figure 2).


Figure 2   Multilayer Switch Module Functional Description

The MSM connects to the switching bus through four full-duplex Gigabit Ethernet interfaces. The Catalyst switch sees the MSM as an external router connected to the switch through the four interfaces. You can group the four Gigabit interfaces into a single Gigabit EtherChannel or configure them as independent interfaces (links). If channeled, the channel supports trunking through 802.1Q or ISL. Once you configure a channel and specify a trunk type, the port-channel interface on the MSM is configured with one subinterface for every VLAN on the switch—providing interVLAN routing. Alternatively, you can configure each Gigabit interface (link) independently as a separate VLAN trunk or nontrunked routed interface.

Note      The supervisor engine software sees each Gigabit interface as a configurable port. For example, if the MSM is installed in slot 4 and you enter the show module 4 command, you will see ports 4/1, 4/2, 4/3, and 4/4. Similarly, the MSM software sees each Gigabit interface as a configurable interface. For example, if you do a show interface from the MSM, you see interfaces g0/0/0, g1/0/0, g3/0/0, and g4/0/0 (there is no g2/0/0). Configuration procedures are provided in the "Configuring the Multilayer Switch Module for InterVLAN Routing" section.

MAC Addresses

Each full-duplex Gigabit Ethernet interface to the Catalyst switching bus is assigned a MAC address; 1024 MAC addresses are available for MSM subinterfaces.

Hot Swapping

Hot swapping lets you remove and replace the MSM while the system is operating. When the system detects that a module has been installed or removed, it automatically runs diagnostic and discovery routines, acknowledges the presence or absence of the module, and resumes system operation without any user intervention.

Power Management

Note      The 1000W power supply is used in the six-slot chassis; the 1300W supply is used in the nine-slot chassis. Do not use the 1000W supply in the nine-slot chassis.

Nine-Slot Chassis

Because the Catalyst 6000 and 6500 series modules have different power requirements, certain switch configurations require more power than a single power supply can provide. Although the power management feature allows you to power all installed modules with two power supplies, redundancy is not supported in this configuration. Loss of power redundancy (and the need for more than one supply) is only an issue when you are using two MSMs.

When operating a nine-slot chassis with power redundancy (or a single supply), the only limitations with two MSMs are that you are limited to five 10/100 modules and cannot have a 1000BaseX Gigabit Interface Converter (GBIC) module in the remaining slot, as shown in Table 3. Redundant and nonredundant power configurations are discussed in the following sections. You can change the configuration of the power supplies at any time.

Six-Slot Chassis

When operating a six-slot chassis with power redundancy (or a single supply), there are no limitations with two MSMs; the chassis supports two MSMs and any combination of additional modules.

Redundant Configuration (Default)

If you have two power supplies of equal wattage installed, you can configure them in a redundant configuration. Use the set power redundancy enable | disable command to enable or disable redundancy. In a redundant configuration, the total power drawn from both supplies is at no time greater than the capability of one supply. If one supply malfunctions, the other supply can take over the entire system load. When you install and turn on two power supplies, each concurrently provides approximately half of the required power to the system. Load sharing and redundancy are enabled automatically; no software configuration is required.

Nonredundant Configuration

In a nonredundant configuration, the power available to the system is the combined power capability of both power supplies. The system powers up as many modules as the combined capacity allows.

For more information on power management, refer to the Catalyst 6000 and 6500 Series Supervisor Engine Installation Guide.

Table 3   Possible Switch Configurations with Two MSMs

Switch Slots Switch Configuration

1

Supervisor

Supervisor

Supervisor

Supervisor

Supervisor

Supervisor

2

MSM

MSM

MSM

MSM

MSM

MSM

3

MSM

MSM

MSM

MSM

MSM

MSM

4

10/1001

10/100

10/100

10/100

10/100

Any module

5

10/100

10/100

10/100

10/100

Any module

Any module

6

10/100

10/100

10/100

Any module

Any module

Any module

7

10/100

10/100

Any module

Any module

Any module

Any module

8

10/100

Any module2

Any module

Any module

Any module

Any module

9

100FX3 (1000BaseX not allowed)

Any module3

Any module3

Any module3

Any module3

Any module3
1The WS-X6248-RJ-TEL (10/100) has the same power consumption as WS-X6248-RJ-45 (10/100).

2Any module = WS-X6224-100FX-MT (100FX) or WS-X6408-GBIC (1000BaseX).

3Or a redundant supervisor engine in slot 2 (that is, two supervisor engines, two MSMs, and five 10/100 modules).

Environmental Monitoring

Environmental monitoring of chassis components provides early warning indications of possible component failure to ensure safe and reliable system operation and avoid network interruptions. For detailed information on environmental monitoring, refer to the Catalyst 6000 and 6500 Series Supervisor Engine Installation Guide.

Selecting a Network Management IP Address

If you manage the MSM directly through a Gigabit Ethernet routing port, any IP address assigned to the corresponding interface can be used for network management purposes provided the port is up.

The supervisor engine reports one IP address assigned to the MSM that can be used for network management through the Cisco Stacks MIB. This section describes how this IP address is selected by the MSM.

The MSM randomly selects an IP address that has been assigned to one of the Gigabit Ethernet switched ports or port channels as the network management IP address, provided the interface or subinterface associated with this IP address is up at the time of selection.

If the selected network management IP address is removed or the interface or subinterface associated with this IP address is shut down, the MSM selects another IP address as a replacement.

If all the interfaces are down or no IP address has been assigned to any interface or subinterface that is up, the IP address for network management is 0.0.0.0.

After each IP address selection or change of the IP address, the MSM sends an unsolicited message to the supervisor engine which then populates the IP address attribute of the Cisco Stacks MIB entry of the MSM.

Use the show net-management command from the MSM router prompt to display the current IP address for network management.

MSM Handling of Access Lists

Access lists (ACLs) are supported for routing protocol distribution lists, route-maps, and access lists for control traffic or traffic that is forwarded to the route processor on the MSM (these ACLs are known as control plane ACLs). The MSM does not support access lists for user traffic meant to traverse through it forwarded by the Catalyst 6000 family switching modules (these ACLs are known as data plane ACLs).

Multilayer Switching (MLS) Support on the MSM

Catalyst 6000 family switches with the MSM support MLS server (not client).

Installing the Multilayer Switch Module

Slot 1 on the Catalyst 6000 and 6500 series switch is reserved for the supervisor engine. If you are using a redundant supervisor engine, it would go in slot 2; otherwise, slot 2 can be used for other modules. The MSM can be installed in any of the remaining slots.

Caution

When removing or inserting a module, always wear an electrostatic discharge (ESD) wrist strap connected to the Catalyst 6000 and 6500 series switch ESD wrist strap connector.

Follow these steps to install the MSM:

Step 1   Connect an ASCII terminal or a PC running terminal emulation software to the console port on the switch (the procedure to connect to the switch console port is the same as connecting to the MSM console port, see the "Console Port" section for details).

Note      You do not need to connect a terminal to the MSM console port. At the end of the installation procedure, use the session command to access the MSM for router configuration.

Step 2   Use a screwdriver to loosen the two captive installation screws and remove the module filler plate or the existing module from the slot you want to use.

Step 3   Guide the MSM into the slot, aligning the sides of the MSM with the guides in the slot (avoid touching the components on the board).

Step 4   While keeping the module oriented horizontally, carefully slide it into the slot until its front panel contacts the ejector levers (see Figure 3).

Step 5  

Using the thumb and forefinger of each hand, simultaneously push the left lever and the right lever in to seat the module all the way into the backplane connector.

Always use the ejector levers when installing or removing modules. A module that is partially seated in the backplane causes the system to halt and subsequently crash.

Step 6   Use a screwdriver to tighten the captive installation screws on the left and right sides of the module (see Figure 3).


Figure 3   Ejector Levers and Captive Installation Screws

Step 7   Check the status of the module as follows:

  • After the MSM has booted and run diagnostics, ensure that the MSM Status LED is green (module operational).
  • Enter the show module command at the Cat6000> prompt to verify that the system acknowledges the new module and reports it as ok in the screen display.

Step 8   After verifying that the MSM is operational, enter the session mod/num command (mod/num is the MSM slot number) at the Cat6000> prompt. You should now be at the router> prompt. Proceed to the "Booting the Multilayer Switch Module for the First Time" section.

Booting the Multilayer Switch Module for the First Time

The MSM is configured at the factory to load a Cisco IOS image (router operating system software) automatically the first time you power on (insert) the MSM into a Catalyst 6000 family switch. The MSM software configuration register, which determines where the MSM loads the image from, is set at the factory to load the image from bootflash (configuration register setting 0x0101). Table 4 shows the MSM default configuration.

Note      For a detailed description of the boot process, see the "Boot Process" section.

Table 4   MSM Default Configuration

Feature Default Value

Host name

Router

Interface configuration

None

VLAN configuration

None

Password encryption

Disabled

Break to console

Ignore

After the MSM goes through power-on self-test diagnostics, and the front panel Status LED is green, you can access the MSM by entering the session mod/num command at the Cat6000> prompt—this gets you to the router> prompt.

After booting the MSM for the first time, you need to configure the MSM internal interfaces and then save the configuration to a file in NVRAM. Configuration guidelines and procedures are provided in the "Configuring the Multilayer Switch Module for InterVLAN Routing" section.

Basic Router Configuration Tasks

These sections describe basic router configuration tasks you need to understand before you configure interVLAN routing:

Accessing Configuration Mode on the Router

To access configuration mode on the router, perform this task:

Task Command
Step 1. At the EXEC prompt, enter enable mode.

Router> enable
Step 2. At the privileged EXEC prompt, enter global configuration mode.

Router# configure terminal
Step 3. Enter the commands to configure interVLAN routing.

See the "Configuring the Multilayer Switch Module for InterVLAN Routing" section.
Step 4. Exit configuration mode.

Router(config)# Ctrl-Z

Viewing and Saving the Router Configuration

To view and save the configuration after you make changes, perform this task:

Task Command
Step 1. View the current operating configuration at the privileged EXEC prompt.

Router# show running-config
Step 2. View the configuration in NVRAM.

Router# show startup-config
Step 3. Save the current configuration to NVRAM.

Router# copy running-config startup-config

Bringing Up a Router Interface

In some cases, a router interface might be administratively shut down. You can check the status of an interface using the show interface command.

To bring up a router interface that is administratively shut down, perform this task in privileged mode:

Task Command
Step 1. Specify the interface to bring up.

Router(config)# interface interface_type interface_number
Step 2. Bring the interface up.

Router(config-if)# no shutdown
Step 3. Exit configuration mode.

Router(config-if)# Ctrl-Z

Assigning a Privileged Mode Password

Task Command
Step 1. Specify a password.

Router(config)# enable password password
Step 2. Exit configuration mode.

Router(config)# Ctrl-Z
Step 3. Save the current configuration to NVRAM.

Router# copy running-config startup-config

To assign a privileged mode password, perform this task:

Configuring the Multilayer Switch Module for InterVLAN Routing

These sections describe how to configure the MSM for interVLAN routing:

Note      Acquire the correct network addresses, such as IP addresses for the MSM interfaces, from your system administrator, or consult your network plan to determine correct addresses before you begin to configure the MSM.

Overview of the Multilayer Switch Module Internal Interfaces

As discussed in the "Functional Description" section, the MSM appears to the
Catalyst switch as an external router connected to the switch through four full-duplex Gigabit Ethernet ports. Conversely, the Catalyst switch appears to the MSM as a four-port Gigabit Ethernet module (see Figure 4). Port 1 on the Catalyst switch side is connected to interface g0/0/0 on the MSM side, port 2 to interface g1/0/0, port 3 to interface g3/0/0, and port 4 to interface g4/0/0.

There are two initial configuration options for the Gigabit switched and routed interfaces—channel the interfaces or configure them as independent links. These options are described in the "Configuration Guidelines" section.


Figure 4   Multilayer Switch Module Internal Interfaces

Overview of InterVLAN Routing

Network devices in different VLANs cannot communicate with one another without a router to route traffic between the VLANs. In most network environments, VLANs are associated with individual networks or subnetworks.

For example, in an IP network, each subnetwork is mapped to an individual VLAN. In an IPX network, each VLAN is mapped to an IPX network number.

VLANs help to control the size of the broadcast domain and keep local traffic local. However, when an end station in one VLAN needs to communicate with an end station in another VLAN, interVLAN communication is required. This communication is supported by interVLAN routing. You configure one or more routers to route traffic to the appropriate destination VLAN.

Figure 5 shows a basic interVLAN routing topology using the MSM. Host A and Host B are in VLAN 10 and Host C is in VLAN 20. The MSM has an interface in each VLAN.


Figure 5   Basic InterVLAN Routing Using the Multilayer Switch Module


When Host A in VLAN 10 needs to communicate with Host B in VLAN 10, it sends a packet addressed to that host. The switch forwards the packet directly to Host B, without sending it to the router.

When Host A sends a packet to Host C in VLAN 20, the switch forwards the packet to the router, which receives the traffic on the VLAN 10 interface. The router checks the routing table, determines the correct outgoing interface, and forwards the packet out the VLAN 20 interface to Host C.

Configuring VTP and VLANs on the Switch

To configure the MSM for interVLAN routing, you must first configure VTP and create and configure VLANs on the switch.

Note      This section describes the basics of VTP and VLAN configuration. For detailed information on configuring VTP and VLANs, refer to the Catalyst 6000 and 6500 Series Software Configuration Guide.

To configure VTP and VLANs on the switch, perform this task in privileged mode:

Task Command
Step 1. Specify the VTP mode.

set vtp mode {client | server | transparent}
Step 2. Configure a VTP domain (if you configured the switch as a VTP client or server).

set vtp domain name
Step 3. Create VLANs on the switch.

set vlan vlan_num
Step 4. Assign ports to the VLAN.

set vlan vlan_num mod_num/port_num

This example shows how to configure VTP, create two VLANs, and assign switch ports to those VLANs:

Console> (enable) set vtp mode server
VTP domain modified
Console> (enable) set vtp domain Corp_Net
VTP domain Corp_Net modified
Console> (enable) set vlan 100
Vlan 100 configuration successful
Console> (enable) set vlan 200
Vlan 200 configuration successful
Console> (enable) set vlan 100 3/1-12
VLAN 100 modified.
VLAN 1 modified.
VLAN Mod/Ports
---- -----------------------
100 1/1-2
3/1-12
Console> (enable) set vlan 200 3/13-24
VLAN 200 modified.
VLAN 1 modified.
VLAN Mod/Ports
---- -----------------------
200 1/1-2
3/13-24
Console> (enable)

Configuration Guidelines

Note      The MSM supports VLAN numbering from 1 to 1000 and can be configured with a maximum of 250 subinterfaces each representing a VLAN interface.

As discussed in the "Functional Description" section, you should view the MSM as an external router with four full-duplex Gigabit Ethernet interfaces. The recommended configuration is to group the four Gigabit Ethernet interfaces into a port-channel and then create subinterfaces on the port-channel. The other configuration option is to configure the interfaces independently. The following sections describe both options. Also included, is a description of the autostate feature.

Option 1: Configuring the Interfaces Independently

This section describes how to configure a Gigabit Ethernet interface independently on the MSM to provide Layer 3 (routed) gateway services. The physical routed interface can provide Layer 3 gateway services to one or more VLANs. When providing Layer 3 gateway services for one VLAN on the interface, VLAN trunking is not necessary and the MSM Gigabit interface need only be included in the specific VLAN, just as you would include a host port. After adding the MSM interface, you need to assign an IP (or IPX) address to the corresponding MSM routed interface (g0/0/0, g1/0/0, g3/0/0, or g4/0/0).

To provide Layer 3 gateway services for more than one VLAN on an MSM Gigabit interface, you must use VLAN trunking. You can use either of two VLAN trunking methods to create the trunk between the MSM interface and the switch: ISL or 802.1Q.

Although you can use either trunking method, you must use ISL in situations where nonroutable protocols such as local-area transport (LAT) and NetBIOS Extended User Interface (NetBEUI) must be bridged between VLANs. After creating a VLAN trunk between the MSM Gigabit interface and a Catalyst 6000 family switch, you configure subinterfaces on the MSM interface to create Layer 3 (routed) gateways for multiple VLANs.

Option 2: Channeling the Interfaces (Recommended Configuration Option)

This section describes how to channel the Gigabit Ethernet interfaces on the MSM using Gigabit EtherChannel to provide Layer 3 (routed) gateway services.

This option involves combining the four Gigabit interfaces into a single Gigabit EtherChannel. Once the EtherChannel is created between the MSM and a Catalyst 6000 family switch, you can configure the channel to provide Layer 3 gateway services to one or multiple VLAN interfaces (the configuration of the VLAN interfaces is identical to the method described in option 1 when trunking is enabled on an independent interface).

While both option 1 and option 2 provide the same service—a routed interface per VLAN on the MSM—option 2 provides a simpler implementation and configuration. By bundling the four MSM Gigabit interfaces into one logical port-channel interface, you can configure Layer 3 VLAN gateways by creating multiple subinterfaces on the same logical interface. Creating subinterfaces on one logical interface is less complicated than manually distributing VLANs among multiple physical and logical interfaces on the MSM.

Autostate Feature

The autostate feature shuts down (or brings up) MSM interfaces/subinterfaces when the following port configuration changes occur on the switch:

  • When the last external port on a VLAN goes down, all MSM interfaces/subinterfaces on that VLAN shut down (are autostated) unless SC0 is on the VLAN or there is another MSM in the chassis with an interface/subinterface in the VLAN. When an MSM interface goes down, the following message is reported to the console for each MSM interface:
%AUTOSTATE-6-SHUT_DOWN
  • When the first external port on the VLAN is brought back up, all MSM interfaces on that VLAN that were previously shut down are brought up. The following message is reported to the console for each MSM interface:
%AUTOSTATE-6-BRING_UP

Use the show autostate entries command to see what MSM interfaces are currently autostated (shutdown or brought up through autostate):

Router# show autostate entries
Port-channel1.5
Port-channel1.6
Port-channel1.4
Router#

It is important to note that the Catalyst switch does not have knowledge of, or control over, the MSM configuration (just as the Catalyst switch does not have knowledge of, or control over, external router configurations). Due to this, the autostate feature will not work on MSM interfaces if the MSM is not properly configured. For example, consider the following MSM trunk configuration:

interface GigabitEthernet0/0/0.200
encap isl 200
.
.

The GigabitEthernet0/0/0.200 interface will not be autostated if any of the following configuration errors are made:

  • VLAN 200 is not configured on the switch.
  • Trunking is not configured on the corresponding Gigabit Ethernet switch port.
  • Trunking is configured but VLAN 200 is not an allowed VLAN on that trunk.

Configuration Procedures

This section describes how to configure the Gigabit Ethernet switched and routed interfaces on the MSM:

Option 1: Configuring the Interfaces Independently

This procedure shows you how to route between four VLANs. VLANs 4, 5, 6, and 7 are configured on a Catalyst 6000 family switch. Trunking is not enabled on any interface as there is just one VLAN on each physical interface. Perform the following steps (in this procedure the MSM is in slot 4):

Step 1   Use the set vlan vlan_num mod_num/port_num command to add each MSM interface to a VLAN:

Cat6000> (enable)set vlan 4 4/1
VLAN 4 modified.
VLAN 1 modified.
.
.
Cat6000> (enable)set vlan 5 4/2
VLAN 5 modified.
VLAN 1 modified.
.
.
Cat6000> (enable)set vlan 6 4/3
VLAN 6 modified.
VLAN 1 modified.
.
.
Cat6000> (enable)set vlan 7 4/4
VLAN 7 modified.
VLAN 1 modified.
.
.

Step 2   Use the session mod_num command to session to the router prompt:

Cat6000> (enable) session 4
Trying Router-4...
Connected to Router-4.
Escape character is \Q^]'.
router>

(a). At the EXEC prompt, enter enable mode:

router> enable
router#

(b). At the privileged EXEC prompt, enter global configuration mode:

router# configure terminal
router(config)#

Step 3   Assign an IP address and subnet mask (or IPX address) to the corresponding routed interface (g0/0/0, g1/0/0, g3/0/0, and g4/0/0).

router(config)# interface g0/0/0
router(config-if)# no shutdown
router(config-if)# ip address ip_address subnet_mask
router(config-if)# exit
router(config)# interface g1/0/0
router(config-if)# no shutdown
router(config-if)# ip address ip_address subnet_mask
router(config-if)# exit
router(config)# interface g3/0/0
router(config-if)# no shutdown
router(config-if)# ip address ip_address subnet_mask
router(config-if)# exit
router(config)# interface g4/0/0
router(config-if)# no shutdown
router(config-if)# ip address ip_address subnet_mask
router(config-if)# exit
Option 2: Channeling the Interfaces (Recommended Configuration Option)

This procedure shows you how to channel the four Gigabit Ethernet switched and routed interfaces and then enable VLAN trunking on the channel. Subinterfaces can then be configured on the channel interface. You configure a subinterface for each allowed VLAN configured on the MSM trunk. For each subinterface, you specify the type of trunking (same as specified on the channel) and then assign an IP address and subnet mask (or IPX address).

Perform the following steps to channel the interfaces (in this procedure the MSM is in slot 4):

Step 1   Use the set port channel mod/ports command to configure a Gigabit EtherChannel:

Cat6000> (enable) set port channel 4/1-4 on
Ports 4/1-4 channel mode set to on.
Cat6000> (enable)

Step 2   Use the set trunk mod_num/port_num command to enable trunking and specify an encapsulation type on the EtherChannel ports (specifying this on one of the EtherChannel ports enables trunking and the specified encapsulation on all ports in the channel):

Cat6000> (enable) set trunk 4/1 nonegotiate isl 1-1005
Port(s) 4/1 trunk mode set to nonegotiate.
Port(s) 4/1 trunk type set to isl.
Cat6000> (enable)

Step 3   Use the session mod_num command to session to the router prompt:

Cat6000> (enable) session 4
Trying Router-4...
Connected to Router-4.
Escape character is \Q^]'.
router>

(a). At the EXEC prompt, enter enable mode:

router> enable