Mirrored packet dropped with Invalid NH on one of the ECMP mirror destination vrouter node with policy based mirroring

[alok kumar]

With policy based mirroring with ECMP destinations, one of the destination vrouter drops packet with invalid NH.

Divakar is aware about the issue and has debugged it.

test scenario:
- 2 traffic VMs on nodec62
- mirror service instance with scaling, 2 mirror instances(v1)
- one mirror instance is on nodec62 and other on nodec12
- start ping between traffic VMs.
- invalid NH count on nodec12 keeps increasing without any packet sent to mirror instance.

Note: packet is mirrored on nodec62 mirror instance correctly when thats selected as the mirror destination.

root@nodec12:~# dropstats | grep -v " 0"

Flow Action Drop 31
Flow Unusable (Eviction) 2

Cloned Original 140586

Invalid NH 8573
Invalid Protocol 24

Duplicated 1

[Saurabh (sgupta84)]

We have tested a workaround for the issue. Packet mode needs to be enabled on the mirrored VMI. Alok found this to be working as well. This has to be release noted for the release.

[Sivakumar Ganapathy (hotlava51)]

This is a low priority bug at this point due to its minimal impact. Hence tracking this for 5.1.0.