Redistribution Problem

Redistribution refers to sharing of routing information among multiple routing protocols running in the same router, which is not shared by default. You should visualize the changes that will take place in the routing table, due to the implementation of redistribution.

Consider the example depicted in Figure 8.8. Company A has both RIP and EIGRP routing protocols running in the network. Figure 8.8 shows part of the network with three routers. Redistribution occurs in router A1. A3 is running EIGRP and A2 is running RIP.

Figure 8.8: An EIGRP network showing redistribution problems.

Observation

Users in the network segment 192.168.10.0/24 in the EIGRP domain are not able to download pages from the Web server located in the network segment 192.168.12.0/24, which is a part of the RIP domain. The IP address of the Web server is 192.168.12.2.

Problem Isolation

The steps to isolating redistribution problems are:

1. Receive negative ping and traceroute responses to IP 192.168.12.2 at A3.

2. Run the show ip route 192.168.12.2 command in A3, which shows that no such route is available.

   These two steps ascertain that the route 192.168.12.0/24 is not propagated in EIGRP.

3. Issue show ip route 192.168.12.2 at A1 where it shows an available RIP route. This ascertains that there is a problem in redistribution in EIGRP from RIP, at A1.

4. Check EIGRP routing configuration to ensure that redistribution is configured for RIP routes.

5. Configure default metric for routes redistributed into EIGRP.

6. Ensure that there is no route filter implemented in redistribution that is causing the blockage of propagation of the route 192.168.12.0/24.

The commands for configuring redistribution into EIGRP from RIP are shown in Listing 8.32.

Listing 8.32 Commands to Configure Redistribution from RIP into EIGRP

router eigrp process-id network  ................... network  ................... network  ................... redistribute rip default-metric bandwidth delay reliability load mtu