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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter22 Configuring IP Unicast Routing Configuring IGRP
To shut down an IGRP routing process, use the no router igrp global configuration command.
This example shows how to configure a router for IGRP an d assi gn it a uto nomo us system 1 09. The
network router configuration commands show the networks directly connected to the router.
Switch(config)# router igrp 109
Switch(config-router)# network 131.108.0.0
Switch(config-router)# network 192.31.7.0
Step8 no metric holddown (Optional) Disable the IGRP hold-down period. The route to a network is
placed in holddown if the router learns that the network is f arther away than
previously known or is down. Holddown keeps new routing information
from being used for a certain period of time. This can prevent routing loops
caused by slow convergence. It is sometimes advantageous to disable
holddown to increase the network's ability to quickly respond to topology
changes; this command provides this function.
Use the metric holddown command if other routers or access servers
within the IGRP autonomous system are not configured with the no metric
holddown command. If all routers are not configured the same way, you
increase the possibility of routing loops.
Step9 metric maximum-hops hops (Optional) Configure the maximum network diameter. Routes with hop
counts exceeding this diameter are not advertised. The default is 100 hops;
the maximum is 255 hops.
Step10 no validate-update-source (Optional) Disable validation of the source IP address of incoming RIP
routing updates. By default, the switch validates the source IP addres s of
incoming RIP routing updates and discards the update if the source addr ess
is not valid.
Step11 variance multiplier (Optional) Define the variance associated with a particular path to enable
unequal-cost load balancing if desired, balancing traffic across all feasible
paths to converge to a new path if a path should fail. The multiplier can be
from 1 to 128; the default is 1 (equal-cost load balanc ing) .
Step12 traffic-share {balanced | min} (Optional) Distribute traffic by one of these methods:
•balanced—Proportionately to the ratios of metri cs
•min—By the minimum-cost route.
Step13 end Return to privileged EXEC mode.
Step14 show ip protocols Verify your entries.
Step15 copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose