AI2524 Router Card User’s Manual
Page 9-18 August 1997
2524UM
Warning: Adjusting the ISO IGRP metric c an dramatically affect
network performance, so ensure that all metric adjust-
ments are made carefully. Because of t he complexity of
this task, it is not recommended unless it is done with
guidance from an experienced system desi gner.
You can use different metrics for the ISO I GRP routing protocol on
CLNS. In router configuration mode, config u re the metric constants
used in the ISO IGRP composite metric calculation of reliability and
load:
metric weights
qos k1 k2 k3 k4 k5
Two additional ISO IGRP metrics can be configured: the bandwidth
and delay associated with an inte rface.
Warning: Using the bandwidth and delay commands to change
the values of the ISO IGRP met rics also changes the val-
ues of IP IGRP metrics.
Adjust ISO IGRP TimersThe basic timing parameters for ISO IGRP are adjustable. Because the
ISO IGRP routing protocol exec utes a distributed, asynchronous rout-
ing algorithm, it is important that these timers be the same for all rout-
ers in the network.
In router configuration mode, adjust ISO IGRP timing parameters:
timers basic
update-interval holddown-
interval invalidinterval
Enable or Disable Split HorizonSplit horizon blocks information about routes from being advertised
out the interface from which that information originated. This feature
usually optimizes communication among multipl e routers, particularly
when links are broken.
In interface configuration mode, either enable or disable split horizon
for ISO IGRP updates:
zEnable split horizon for ISO IGRP updates.
clns split-horizon