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Configuring IP Routing Protocol-Independent Features
Redistributing Routing Information
IPC-369
Cisco IOS IP Configuration Guide
See the “BGP Route Map Examples” section in the “Configuring BGP” chapter for examples of BGP
route maps. See the “BGP Community with Route Maps Examples” section in the “Configuring BGP”
chapter for examples of BGP communities and route maps.
To distribute routes from one routing domain into another and to control route redistribution, use the
following commands in router configuration mode:
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 quantities. In such situations,
an artificial metric is assigned to the redistributed route. Because of this unavoidable tampering with
dynamic information, carelessly exchanging routing information between different routing protocols can
create routing loops, which can seriously degrade network operation.
Understanding Supported Metric Translations
This section describes supported automatic metric translations between the routing protocols. The
following descriptions assume that you have not defined a default redistribution metric that replaces
metric conversions:
• RIP can automatically redistribute static routes. It assigns static routes a metric of 1 (directly
connected).
• BGP does not normally send metrics in its routing updates.
Router(config-route-map)# set metric-type internal
Sets the Multi Exit Discriminator (MED) value on
prefixes advertised to Exterior BGP neighbor to match
the Interior Gateway Protocol (IGP) metric of the next
hop.
Router(config-route-map)# set tag tag-value
Sets the tag value to associate with the redistributed
routes.
Command Purpose
Command Purpose
Step 1
Router(config-router)# 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] [subnets]
Redistributes routes from one routing protocol to
another routing protocol.
Step 2
Router(config-router)# default-metric number
Causes the current routing protocol to use the same
metric value for all redistributed routes (BGP, OSPF,
RIP).
Step 3
Router(config-router)# default-metric bandwidth
delay reliability loading mtu
Causes the IGRP or Enhanced IGRP (EIGRP) routing
protocol to use the same metric value for all
non-IGRP redistributed routes.
Step 4
Router(config-router)# no default-information {in |
out}
Disables the redistribution of default information
between IGRP processes, which is enabled by
default.