AIS AI2524 user manual Set the Retransmission Interval, Specify Designated Router Election

AI2524 Router Card User’s Manual

Set the Retransmission Interval

In interface configuration mode, configure the number of seconds be tween retransmission of LSPs for point-to-point links.

isis retransmit-interval seconds

The value you specify should be an integer greater than the expected round-trip delay between any two routers on the network. The setting of this parameter should be conservative, or needless retransmission will result. The value you determine should be larger for serial lines and virtual links.

Specify Designated Router Election

You can configure the priority to use for designated router election. Priorities can be configured for Level1 an d Level2 individually. Th designated router enables a reduction in the number of adjacencies re- quired on a multiaccess network, which in turn reduces the amount of routing protocol traffic and the size of the topology database.

In interface configuration mode, configure the priority to use for des- ignated router election:

isis priority value {level-1 level-2}

Specify the Interface Circuit Type

It is normally not necessary to configure this feature because the IS-IS protocol automatically determines area boundaries and keeps L evel1 and Leve l2 routing separate. However, you can specify the adjacency levels on a specified interface.

In interface configuration mode, configure the adjacency for neigh- bors on the specified interface:

isis circuit-type {level-1 level-1-2 level-2-only}

If you specify Level 1, a Level 1 adjacency is established if there is at least one area address common to both this node and its neighbors.

If you specify both Le vel1 and L evel2 (the default value), a Level1 and 2 adjacency is established if the neighbor is also configured as both Leve l1 and Lev el2 and there is at least one area in common. If there is no area in common, a Leve l2 adjacency is established.

If you specify Leve l2 only, a Le vel2 adjacency is established. If the neighbor router is a Leve l1 router, no adjacency is established.

Page 9-32	August 1997
	2524UM