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Catalyst 3550 Multilayer Switch Software Configuration Guide
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Chapter22 Configuring IP Unicast Routing
Configuring Protocol-Independent Features
You can distribute routes from one routing domain into another and control route distri bu tio n.
Beginning in privileged EXEC mode, follow these steps to control route redistribution. Note that the
keywords are the same as defined in the previous procedure.
To disable redistribution, use the no form of the commands.
The metrics of one routing protocol do not necessarily translate into the metrics of another. For example,
the RIP metric is a hop count, and the IGRP metric is a combination of five qualities. In these situat ions,
an artificial metric is assigned to the redistributed route. Uncontrolled exchanging of routing inform ation
between different routing protocols can create routing loops and seriously degrade network operati on.
If you have not defined a default redistribution metric that replaces metric conver sio n, some au toma ti c
metric translations occur between routing protocols:
•RIP can automatically redistribute static routes. It assigns static routes a metric of 1 (directly
connected).
•IGRP can automatically redistribute static routes and information from other IGRP-routed
autonomous systems. IGRP assigns static routes a metric that identifies them as directly connected.
It does not change the metrics of routes derived from IGRP updates from other autonomous systems.
•Any protocol can redistribute other routing protocols if a default mod e i s in effect.
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 router {rip | ospf | igrp | eigrp} Enter router configuration mode.
Step3 redistribute protocol [process-id] {level-1 | level-1-2 |
level-2} [metric metric-value] [metric-type type-value]
[match internal | external type-value] [tag tag-value]
[route-map map-tag] [weight weight] [subnets]
Redistribute routes from one routing protocol to
another routing protocol.
Step4 default-metric number Cause the current routing protocol to use th e same
metric value for all redistributed routes (RIP and
OSPF).
Step5 default-metric bandwidth delay reliability loading mtu Cause the IGRP or EIGRP routing protocol to use the
same metric value for all non-IGRP redistributed
routes.
Step6 no default-information {in | out} Disable the redistribution of default information
between IGRP processes, which is enabled by default.
Step7 end Return to privileged EXEC mode.
Step8 show route-map Display all route maps configured or only the one
specified to verify configuration.
Step9 copy running-config startup-config (Optional) Save your entries in the configuration file.