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Example: Enabling Wide IS-IS Metrics for Traffic Engineering

 

This example shows how to allow a wide range of metric values on IS-IS interfaces.

Requirements

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

Overview

Figure 1 shows the topology used in this example.

Figure 1: IS-IS Wide Metrics Topology
IS-IS Wide Metrics Topology

This example describes the steps on Device R1.

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.

Device R1

Step-by-Step Procedure

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 checksums:

  1. Configure a metric of 100 on the interface at both IS-IS levels.
  2. Enable wide metrics.

Results

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

If you are done configuring the device, enter commit from configuration mode.

Verification

Confirm that the configuration is working properly.

Verifying That Wide Metrics Are Enabled

Purpose

Make sure that the interface has the expected metric.

Action

From operational mode, enter the show isis interface extensive command.

user@R1> show isis interface lt-1/2/0.1 extensive

Meaning

The output shows that the metric is set to 100, as expected, at both Level 1 and Level 2.