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AI2524 Router Card User’s Manual
Page 9-30 August 1997
2524UM
Configure IS-IS Interface Parameters
Cisco's IS-IS implementation allows you to customize certain inter-
face-specific IS-IS parameters:
z
Adjust IS-IS Link-State Metrics
z
Set the Advertised Hello Interval and Hello Multiplier
z
Set the Advertised CSNP Interval
z
Set the Retransmission Interval
z
Specify Designated Router Election
z
Specify the Interface Circuit Type
z
Configure 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