EIGRP Add Path Support

This topic is to discuss the following lesson:

Hi Rene,

Hub(config-router-af-interface)#add-paths <1-4> "Number of add paths to be advertised"
Can you explain more about when we use the number of 1, 2, 3, or 4?
Even though I tested with add-paths of 1-2-3-4, the result’s nothing change.

Spoke1#sho ip route eigrp 
D [90/102405120] via, 00:01:42, Tunnel0
                      [90/102405120] via, 00:01:42, Tunnel0

Hello Dawn

The add-paths is used when you have multiple paths from the hub to a specific network that can be reached via multiple spokes. EIGRP however advertises only one path as the best path to connected spokes. The add-paths command allows EIGRP to advertise up to an additional four. This will only be seen if multiple paths are present to the same network.

For the topology in question:
As can be seen, there are two routes to the network, via Spoke1 and Spoke2. The hub will have only one route to this network by default. The add-paths command will allow both the Spoke1 and Spoke2 route be added in the routing table.

More information on the add-paths command can also be found at this Cisco documentation.

I hope this has been helpful!


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Hi Laz,

Thanks for your kind explanation.
I understood.