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Cisco IOS Cookbook, 2nd Edition by Ian Brown, Kevin Dooley

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PE-CE Communication via EIGRP

Problem

You want to use EIGRP to exchange routing information between your CE and PE routers.

Solution

The solution to this problem is similar to the RIP solution in Recipe 26.5 and the OSPF solution in Recipe 26.6. First we have to enable the routing protocol on the CE routers, which we do in the usual way:

Router-CE-A1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router-CE-A1(config)#router eigrp 156
Router-CE-A1(config-router)#network 192.168.1.0
Router-CE-A1(config-router)#network 192.168.5.0
Router-CE-A1(config-router)#no auto-summary
Router-CE-A1(config-router)#end
Router-CE-A1#

We have disabled EIGRP autosummarization because, for the clarity of the example, we want to see all of the subnets. The other CE router’s configuration is similar:

Router-CE-A2#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router-CE-A2(config)#router eigrp 156
Router-CE-A2(config-router)#network 10.0.0.0
Router-CE-A2(config-router)#network 192.168.3.0
Router-CE-A2(config-router)#no auto-summary
Router-CE-A2(config-router)#end
Router-CE-A2#

And then we must configure the PE routers to take part in EIGRP for this VRF:

Router-PE1#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router-PE1(config)#router eigrp 1001
Router-PE1(config-router)#no auto-summary
Router-PE1(config-router)#address-family ipv4 vrf NetworkA
Router-PE1(config-router-af)#redistribute bgp 100 metric 10000 10 255 ...

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