AIS AI2524 user manual Adjust IS-IS Link-State Metrics, Isis metric default-metriclevel-1 level-2

AI2524 Router Card User’s Manual

Configure IS-IS Interface Parameters

Cisco's IS-IS implementation allows you to customize certain inter- face-specific IS-IS parameters:

zAdjust IS-ISLink-State Metrics

zSet the Advertised Hello Interval and Hello Multiplier

zSet the Advertised CSNP Interval

zSet the Retransmission Interval

zSpecify Designated Router Election

zSpecify the Interface Circuit Type

zConfigure IS-IS Authentication Passwords

You are not required to alter any of these parameters, but some inter face parameters must be consistent across all routers in the network. Therefore, if you do configure any of these parameters, be sure the configurations for all routers on the network have compatible values.

Adjust IS-IS Link-State Metrics

You can configure a cost for a specified interface. The default metric is used as a value for the IS-IS metric. This is the value assigned when there is no quality of service (QOS) routing performed. The only met- ric that is supported by the Cisco IOS software and that you can con- figure is the default-metric, which you can configure for L evel1 or Level 2 routing or both.

In interface configuration mode, configure the link state metric:

isis metric default-metric{level-1 level-2}

Set the Advertised Hello Interval and Hello Multiplier

You can specify the length of time (in seconds) between hello packets that the Cisco IOS software sends on the interface. You can also change the default hello packet multiplier used on the interface to de- termine the hold time transmitted in IS-IS hello packets (the default is 3).

The hold time determines how long a neighbor waits for another hello packet before declaring the neighbor down. This time determines how

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