AIS AI2524 Set the Advertised Csnp Interval, Isis hello-interval seconds level-1 level-2

Chapter 9: AI2524 OSI/CLNP Configuration Steps

quickly a failed link or neighbor is detected so that routes can be recal- culated.

In interface configuration mode, set the advertised hello interval and multiplier:

1.Specify the length of time, in seconds, between hello packets th software sends on the specified interface.

isis hello-interval seconds {level-1 level-2}

2.Specify the number used to multiply the hello interval seconds by to determine the total holding time transmitted in the IS-IS hello packet. If not specified, a multiplier of 3 is used.

isis hello-multiplier multiplier [{level-1 level-2}]

The hello interval can be configured independently for Level1 and Level 2, except on serial point-to-point interfaces. (Because there is only a single type of hello packet sent on serial links, the hello packet is independent of Lev el1 or Lev el2.) Specify an optional level for X.25, SMDS, and Frame Relay multiaccess networks.

Use the isis hello-multipliercommand in circumstances where hello packets are lost frequently and IS-IS adjacencies are fail- ing unnecessarily. You can raise the hello multiplier and lower th hello interval (isis hello-intervalcommand) correspond ingly to make the hello protocol more reliable without increasing th time required to detect a link failure.

Set the Advertised CSNP Interval

CSNPs are sent by the designated router to maintain database synchro- nization.

In interface configuration mode, configure the IS-IS CSNP interval fo the interface:

isis csnp-interval seconds {level-1 level-2}

This feature does not apply to serial point-to-point interfaces. It does apply to WAN connections if the WAN is viewed as a multiaccess meshed network.

August 1997	Page 9-31
2524UM