ECMP (Equal Cost Multi Path)

traffic-flow-with-ECMP

If the total IGP cost to a destination are same for two path, these paths are called Equal Cost Multi Path. Normally if there are two path that have same IGP cost, in Alcatel-Lucent Service Routers, lower interface wins and the traffic goes through it.

Traffic Flow without ECMP, alcatel-lucent service routers, SR 7750
 

Traffic Flow Without ECMP
Think about the above topology, without ECMP the traffic only goes through the A path. And when you use the below commands to see the tables, you will realize the below results:

show router ldp bindings (2 path, A and B)
show router fib 1 (1 path, A)

Lesson tags: mpls, ecmp
Back to: Nokia IRP Course > ECMP and BFD

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