Filter
Top Products
Configuring IP Routing Protocol-Independent Features
IP Routing Protocol-Independent Configuration Examples
IPC-383
Cisco IOS IP Configuration Guide
RIP and EIGRP Redistribution Examples
This section provides a simple RIP redistribution example and a complex redistribution example
between Enhanced IGRP (EIGRP) and BGP.
Simple Redistribution Example
Consider a WAN at a university that uses RIP as an interior routing protocol. Assume that the university
wants to connect its WAN to a regional network, 172.16.0.0, which uses Enhanced IGRP (EIGRP) as the
routing protocol. The goal in this case is to advertise the networks in the university network to the routers
on the regional network. The commands for the interconnecting router are listed in the example that
follows:
router eigrp 1
network 172.16.0.0
redistribute rip
default-metric 10000 100 255 1 1500
distribute-list 10 out rip
In this example, the router global configuration command starts an EIGRP routing process. The
network router configuration command specifies that network 172.16.0.0 (the regional network) is to
send and receive EIGRP routing information. The redistribute router configuration command specifies
that RIP-derived routing information be advertised in the routing updates. The default-metric router
configuration command assigns an EIGRP metric to all RIP-derived routes. The distribute-list router
configuration command instructs the Cisco IOS software to use access list 10 (not defined in this
example) to limit the entries in each outgoing update. The access list prevents unauthorized advertising
of university routes to the regional network.
Complex Redistribution Example
The most complex redistribution case is one in which mutual redistribution is required between an IGP
(in this case EIGRP) and BGP.
Suppose that BGP is running on a router somewhere else in autonomous system 50000 and that the BGP
routes are injected into EIGRP routing process 1. You must use filters to ensure that the proper routes
are advertised. The example configuration for router R1 illustrates use of access filters and a distribution
list to filter routes advertised to BGP neighbors. This example also illustrates configuration commands
for redistribution between BGP and EIGRP.
! Configuration for router R1:
router bgp 50000
network 172.18.0.0
neighbor 192.168.10.1 remote-as 2
neighbor 192.168.10.15 remote-as 1
neighbor 192.168.10.24 remote-as 3
redistribute eigrp 1
distribute-list 1 out eigrp 1
!
! All networks that should be advertised from R1 are controlled with access lists:
!
access-list 1 permit 172.18.0.0
access-list 1 permit 172.16.0.0
access-list 1 permit 172.17.0.0
!
router eigrp 1
network 172.18.0.0
network 192.168.10.0