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    partial output of show ip eigrp neighbor on R3:

    R3#show ip eigrp neighbor

    IP-EIGRP neighbors for process 100

    H Address Interface

    0 172.12.23.2 Et0

    The adjacency has f

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    I've read some non-Cisco documentation that EIGRP will not allow adjacencies to form when secondary addresses are used. This is incorrect, but there is one common error that can result if both addresses are not secondary. Let's take a look at R2 and R3, which will be using secondary addresses to form an EIGRP adjacency.

    R2(config)#interface ethernet0

    R2(config-if)#ip address 172.12.23.2 255.255.255.0

    R2(config-if)#ip address 23.23.23.2 255.255.255.0 secondary

    R2(config)#router eigrp 100

    R2(config-router)#no auto-summary

    R2(config-router)#network 23.23.23.0 0.0.0.255

    R3(config)#interface ethernet0

    R3(config-if)#ip address 172.12.23.3 255.255.255.0

    R3(config-if)#ip address 23.23.23.3 255.255.255.0 secondary

    R3(config)#router eigrp 100

    R3(config-router)#no auto-summary

    R3(config-router)#network 23.23.23.0 0.0.0.255

    Here's the partial output of show ip eigrp neighbor on R3:

    R3#show ip eigrp neighbor

    IP-EIGRP neighbors for process 100

    H Address Interface

    0 172.12.23.2 Et0

    The adjacency has fo

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    s take a look at R2 and R3, which will be using secondary addresses to form an EIGRP adjacency.

    R2(config)#interface ethernet0

    R2(config-if)#ip address 172.12.23.2 255.255.255.0

    R2(config-if)#ip address 23.23.23.2 255.255.255.0 secondary

    R2(config)#router eigrp 100

    R2(config-router)#no auto-summary

    R2(config-router)#network 23.23.23.0 0.0.0.255

    R3(config)#interface ethernet0

    R3(config-if)#ip address 172.12.23.3 255.255.255.0

    R3(config-if)#ip address 23.23.23.3 255.255.255.0 secondary

    R3(config)#router eigrp 100

    R3(config-router)#no auto-summary

    R3(config-router)#network 23.23.23.0 0.0.0.255

    Here's the partial output of show ip eigrp neighbor on R3:

    R3#show ip eigrp neighbor

    IP-EIGRP neighbors for process 100

    H Address Interface

    0 172.12.23.2 Et0

    The adjacency has f

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    .2 255.255.255.0 secondary

    R2(config)#router eigrp 100

    R2(config-router)#no auto-summary

    R2(config-router)#network 23.23.23.0 0.0.0.255

    R3(config)#interface ethernet0

    R3(config-if)#ip address 172.12.23.3 255.255.255.0

    R3(config-if)#ip address 23.23.23.3 255.255.255.0 secondary

    R3(config)#router eigrp 100

    R3(config-router)#no auto-summary

    R3(config-router)#network 23.23.23.0 0.0.0.255

    Here's the partial output of show ip eigrp neighbor on R3:

    R3#show ip eigrp neighbor

    IP-EIGRP neighbors for process 100

    H Address Interface

    0 172.12.23.2 Et0

    The adjacency has f

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    23.3 255.255.255.0

    R3(config-if)#ip address 23.23.23.3 255.255.255.0 secondary

    R3(config)#router eigrp 100

    R3(config-router)#no auto-summary

    R3(config-router)#network 23.23.23.0 0.0.0.255

    Here's the partial output of show ip eigrp neighbor on R3:

    R3#show ip eigrp neighbor

    IP-EIGRP neighbors for process 100

    H Address Interface

    0 172.12.23.2 Et0

    The adjacency has f

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    partial output of show ip eigrp neighbor on R3:

    R3#show ip eigrp neighbor

    IP-EIGRP neighbors for process 100

    H Address Interface

    0 172.12.23.2 Et0

    The adjacency has formed! Note the address is actually the primary IP address on the interface, even though we used the secondary network number in the EIGRP network command. Personally, I stay away from secondary network numbers if at all possible, but you should know that secondary IP addresses can be used to create EIGRP adjacencies.

    What's the common error with using secondary addresses, you asked? It's when an address from the same subnet is the primary interface address on one neighbor and the secondary interface address on another. Let's say we had configured R2 and R3 as follows:

    R2(config)#int e0

    R2(config-if)#ip address 23.23.23.2 255.255.255.0

    R3(config)#interface ethernet0

    R3(config-if)#ip address 172.12.23.3 255.255.255.0

    R3(config-if)#ip address 23.23.23.3 255.255.255.0 secondary

    On R2, we get this message:

    01:54:05: IP-EIGRP: Neighbor 172.12.23.3 not on com

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