AIS AI2524 Specify Preferred Routes, Configure ES-IS Hello Packet Parameters, Distance value clns

Chapter 9: AI2524 OSI/CLNP Configuration Steps

router isis

redistribute rip route-map ourmap redistribute iso-igrp remote route-map ourmap

!

route-map ourmap permit match ip address 1

match clns address ourprefix set metric 5

set level level-2

!

access-list 1 permit 160.89.0.0 0.0.255.255 clns filter-set ourprefix permit 49.0001.0002...

Specify Preferred Routes

When multiple routing processes are running in the same router for CLNS, it is possible for the same route to be advertised by more than one routing process. The Cisco IOS software always picks the route whose routing protocol has the lowest administrative distance. The lower the value of the distance, the more preferred the route.

By default, these administrative distances are assigned:

zStatic routes—10

zISO IGRP routes—100

zIS-IS routes—110

In router configuration mode, change an administrative distance for a route:

distance value [clns]

If you want an ISO IGRP prefix route to override a static route, you must set the distance for the routing process to be lower than 10.

Configure ES-IS Hello Packet Parameters

You can configure ES-IS parameters for communication between end systems and routers. In general, you should leave these parameters at their default values.

When configuring an ES-IS router, be aware of these items:

zES-IS does not run over X.25 links unless the broadcast facility is enabled.

August 1997	Page 9-49
2524UM