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Example: Configuring IS-IS Multicast Topology

 

This example shows how to configure a multicast topology for an IS-IS network.

Requirements

Before you begin, configure IS-IS on all routers. See Example: Configuring IS-IS for information about the required IS-IS configuration.

This example uses the following hardware and software components:

  • Junos OS Release 7.3 or later

  • M Series, MX Series, and T Series routers

Overview

This example shows an IS-IS multicast topology configuration. Three routers are connected to each other. A loopback interface is configured on each router.

Figure 1 shows the sample network.

Figure 1: Configuring IS-IS Multicast Topology
Configuring IS-IS Multicast Topology

Configuration

CLI Quick Configuration

To quickly configure this example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, and then copy and paste the commands into the CLI at the [edit] hierarchy level.

Router R1

Router R2

Router R3

The following example requires you to navigate various levels in the configuration hierarchy. For information about navigating the CLI, see Using the CLI Editor in Configuration Mode in the CLI User Guide.

To configure IS-IS multicast topologies:

  1. Enable the multicast topology for IS-IS by using the ipv4-multicast statement.

    Routers R1, R2, and R3

  2. Enable multicast metrics on the first SONET/SDH Interface by using the ipv4-multicast-metric statement.

    Router R1

    Router R2

    Router R3

  3. Enable multicast metrics on a second sonet Interface by using the ipv4-multicast-metric statement.

    Router R1

    Router R2

    Router R3

  4. Disable the out-of-band management port, fxp0.

    Routers R1, R2, and R3

  5. If you are done configuring the routers, commit the configuration.

    Routers R1, R2, and R3

Results

From configuration mode, confirm your configuration by using the show protocols isis statement. If the output does not display the intended configuration, repeat the instructions in this example to correct the configuration.

Router R1

user@R1# show protocols isis

Router R2

user@R2# show protocols isis

Router R3

user@R3# show protocols isis

Verification

Confirm that the configuration is working properly.

Verifying the Connection Between Routers R1, R2, and R3

Purpose

Make sure that Routers R1, R2, and R3 are connected to each other.

Action

Ping the other two routers from any router, to check the connectivity between the three routers as per the network topology.

user@R1> ping 10.0.3.9
user@R1> ping 10.0.3.10
user@R2> ping 10.0.2.9
user@R2> ping 10.0.2.10
user@R3> ping 10.0.1.10
user@R3> ping 10.0.1.9

Meaning

Routers R1, R2, and R3 have a peer relationship with each other.

Verifying That IS-IS Is Configured

Purpose

Make sure that the IS-IS instance is running on Routers R1, R2, and R3, and that they are adjacent to each other.

Action

Use the show isis adjacency detail command to check the adjacency between the routers.

Router R1

user@R1> show isis adjacency detail

Router R2

user@R2> show isis adjacency detail

Router R3

user@R3> show isis adjacency detail

Meaning

IS-IS is configured on Routers R1, R2, and R3, and they are adjacent to each other.

Verifying the Configured Multicast Metric Values

Purpose

Make sure that the SPF calculations are accurate as per the configured multicast metric values on Routers R1, R2, and R3.

Action

Use the show isis spf results command to check the SPF calculations for the network.

Router R1

user@R1> show isis spf results

Router R2

user@R2> show isis spf results

Router R3

user@R3> show isis spf results

Meaning

The configured multicast metric values are used in SPF calculations for the IS-IS network.

Verifying the Configuration of the Multicast Topology

Purpose

Make sure that the multicast topology is configured on Routers R1, R2, and R3.

Action

Use the show isis database detail command to verify the multicast topology configuration on the routers.

Router R1

user@R1> show isis database detail

Router R2

user@R2> show isis database detail

Router R3

user@R3> show isis database detail

Meaning

Multicast topology is configured on Routers R1, R2, and R3.