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Cisco Bug: CSCvv77921 - Behavior change in default route load balance between 17.2.1r and 17.3.1a

Last Modified

Oct 22, 2020

Products (1)

  • Cisco SD-WAN

Known Affected Releases

17.3.1a

Description (partial)

Symptom:
ECMP's behavior is different on 17.2.1r and 17.3.1a

Conditions:
Monitor Server(non SDWAN, nat tp pub IP)<------->cedge(wan IF)
Cedge: does not have Monitor Server's IP, So it check default route:
multiple defaults routes in rib.

In 17.2.1r: echo reply always choose the same egress, even after IF shut/no shut, device reload
In 17.3.1a: echo reply's egress may change after IF shut/no shut , device reload
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  • Status
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