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Nexus 5500 duplicate ICMP echo-replay

jsluzewski
Level 1
Level 1

I am experiencing inconsistent echo-replay from devices connected via VPC to Nexus 5500s while pinging from the Nexus exec prompt.

In some cases I receive normal response when pinging from one Nexus,  but no response when pinging from the other switch. In other instance I receive normal response to one Nexus, and duplicate replays to the other. It looks like a VPC related bug. NXOS is 5.1.3.N2.1

5501# ping 10.12.12.232

PING 10.12.12.232 (10.12.12.232): 56 data bytes

64 bytes from 10.12.12.232: icmp_seq=0 ttl=253 time=8.585 ms

64 bytes from 10.12.12.232: icmp_seq=0 ttl=254 time=9.227 ms (DUP!)

64 bytes from 10.12.12.232: icmp_seq=1 ttl=253 time=1.011 ms

64 bytes from 10.12.12.232: icmp_seq=2 ttl=253 time=8.097 ms

64 bytes from 10.12.12.232: icmp_seq=2 ttl=254 time=9.429 ms (DUP!)

64 bytes from 10.12.12.232: icmp_seq=3 ttl=253 time=18.195 ms

64 bytes from 10.12.12.232: icmp_seq=4 ttl=253 time=8.807 ms

5502# ping 10.12.12.232

PING 10.12.12.232 (10.12.12.232): 56 data bytes

64 bytes from 10.12.12.232: icmp_seq=0 ttl=254 time=0.985 ms

64 bytes from 10.12.12.232: icmp_seq=1 ttl=254 time=0.884 ms

64 bytes from 10.12.12.232: icmp_seq=2 ttl=254 time=0.875 ms

64 bytes from 10.12.12.232: icmp_seq=3 ttl=254 time=3.105 ms

64 bytes from 10.12.12.232: icmp_seq=4 ttl=254 time=8.378 ms

Thanks

Jarek

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