Configuring Link-State Metrics

You can configure the routing metric (cost) for an IS-IS interface. Routes with lower total path metrics are preferred over those with higher path metrics.

isis metric

• Use to configure a cost for a specified interface.
• You can select a number in the range 0–63 if you configured the router with the metric-style narrow command. You can select a number in the range 0–16277215 if you configured the router with the metric-style transition or the metric-style wide command.
• The default value is 10. The default metric is the value assigned when no quality of service (QoS) routing is performed.
• You can configure the default metric for a specified interface by selecting level 1 or level 2 routing. This resets the metric only for level 1 or level 2 routing, respectively. If you do not specify a level, the command specifies both level 1 and level 2 by default.
• We recommend that you configure a reference bandwidth if you want the default cost on interfaces to be related to link speed. If you do not, the default IS-IS metrics are simply hop-count-like metrics.
• Example

  host1(config-if)#isis metric 20 level-2

• Use the no version to restore the default value, 10.
• See isis metric

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