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Cisco Catalyst Blade Switch 3130 for Dell Software Configuration Guide
OL-13270-01
Chapter38 Configuring IP Unicast Routing
Configuring Protocol-Independent Features
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 trans late 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 the se situatio ns,
an artificial metric is assigned to the redistributed route. Uncontrolled exchanging of routing information
between different routing protocols can create routing loops and seriously degrade network operation.
If you have not defined a default redistribution metric that replaces met ric conversion, som e au t omat ic
metric translations occur between routing protocols:
•RIP can automatically redistribute static routes. It assigns static routes a metric of 1 (directly
connected).
•Any protocol can redistribute other routing protocols if a default mode is in e ffect.
Configuring Policy-Based Routing
You can use policy-based routing (PBR) to configure a defined policy for traffic flows. By using PBR,
you can have more control over routing by reducing the reliance on routes de rived from r outing
protocols. PBR can specify and implement routing policies that allow or deny paths based on:
•Identity of a particular end system
•Application
•Protocol
You can use PBR to provide equal-access and source-sensitive routing, routing based on interactive
versus batch traffic, or routing based on dedicated links. For example, you could transfer stock recor ds
to a corporate office on a high-bandwidth, high-cost link for a short time while transmitting routine
application data such as e-mail over a low-bandwidth, low-cost link.
Command Purpose
Step1 configure terminal Enter global configuration mode.
Step2 router {bgp | rip | ospf | 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. If no route-maps are
specified, all routes are redistributed. If the keyword
route-map is specified with no map-tag, no routes are
distributed.
Step4 default-metric number Cause the current routing protocol to use th e same
metric value for all redistributed routes (BGP, RIP and
OSPF).
Step5 default-metric bandwidth delay reliability loading mtu Cause the EIGRP routing protocol to use the same
metric value for all non-EIGRP redistributed routes.
Step6 end Return to privileged EXEC mode.
Step7 show route-map Display all route maps configured or only the one
specified to verify configuration.
Step8 copy running-config startup-config (Optional) Save your entries in the configuration file.