metric (Protocols IS-IS)

Syntax

Hierarchy Level

Description

Specify the IPv4 unicast topology metric value for the level. The IS-IS interface metrics for the IPv6 topology can be configured independently of the IPv4 metrics.

All IS-IS routes have a cost, which is a routing metric that is used in the IS-IS link-state calculation. The cost is an arbitrary, dimensionless integer that can be from 1 through 63, or from 1 through 16,777,215 (2²⁴ – 1) if you are using wide metrics.

Similar to other routing protocols, IS-IS provides a way of exporting routes from the routing table into the IS-IS network. When a route is exported into the IS-IS network without a specified metric, IS-IS uses default metric values for the route, depending on the protocol that was used to learn the route.

Table 1 depicts IS-IS route export metric default values.

Table 1: Default Metric Values for Routes Exported into IS-IS
Protocol Used for Learning the Route	Default Metric Value
Direct	10
Static	Same as reported by the protocol used for exporting the route
Aggregate	10
Generate	10
RIP	Same as reported by the protocol used for exporting the route
OSPF	Same as reported by the protocol used for exporting the route
BGP	10

The default metric values behavior can be customized by using routing policies.

Options

metric—Metric value.

Range: 1 through 63, or 1 through 16,777,215 (if you have configured wide metrics)

Default: 10 (for all interfaces except lo0), 0 (for the lo0 interface)

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced before Junos OS Release 7.4.

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