Route Filtering: EIGRP and RIP mixed protocol lab 1.2

Objective: Configure a route filter at A that will only allow subnets 172.16.2.0/24, 172.16.8.0/24 and 172.16.9.0/24 to be advertised into RIP domain.

D#sh ip route rip
172.16.0.0/24 is subnetted, 13 subnets
R       172.16.253.0/24 is possibly down,
routing via 172.16.252.1, FastEthernet0/0
R       172.16.254.0/24 is possibly down,
routing via 172.16.252.1, FastEthernet0/0
R       172.16.251.0/24 is possibly down,
routing via 172.16.252.1, FastEthernet0/0
R       172.16.8.0 [120/3] via 172.16.252.1, 00:00:02, FastEthernet0/0
R       172.16.9.0 [120/3] via 172.16.252.1, 00:00:02, FastEthernet0/0
R       172.16.11.0/24 is possibly down,
routing via 172.16.252.1, FastEthernet0/0
R       172.16.7.0/24 is possibly down,
routing via 172.16.252.1, FastEthernet0/0
R       172.16.1.0/24 is possibly down,
routing via 172.16.252.1, FastEthernet0/0
R       172.16.2.0 [120/3] via 172.16.252.1, 00:00:02, FastEthernet0/0
R       172.16.3.0/24 is possibly down,
routing via 172.16.252.1, FastEthernet0/0

A(config-router)#do sh run | s router rip
router rip
redistribute eigrp 100 metric 3
passive-interface FastEthernet0/0
passive-interface FastEthernet0/1
network 172.16.0.0
distribute-list 2 out FastEthernet1/0
distribute-list 1 in FastEthernet1/1
distribute-list 3 out

A(config-router)#do sh access-list 3
Standard IP access list 3
10 permit 172.16.2.0, wildcard bits 0.0.0.255 (35 matches)
20 permit 172.16.8.0, wildcard bits 0.0.0.255 (35 matches)
30 permit 172.16.9.0, wildcard bits 0.0.0.255 (34 matches)

Caution: Do not apply the distribute list in EIGRP, it will filter internal routes as well and causing your adjacency to be down.


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