nexus 3548p mac address learning failed on switch interfaces with nx-os 6.0(2)A4(3)

[MICHAEL NOACK]

I have upgraded our nexus 3548p in warp mode with nx-os version 6.0(2)A4(3). Since then mac addresses are not learned anymore or at least not all. there is only one server which has no problen and 8 other servers are not reachable anymore The last nx-os version known running fine is version 6.0(2)A3(4). the main difference i can see is only the size of the nx-os file. the upgrade process was running successful without errors.

Thanks Michael

[Patrik Lundquist]

The reduced system image size is because of removal of debug symbols. Nothing to be worried about.

I've experienced a similar problem with 6.0(2)A1(1b) and Warp mode and only a reboot of the switch helped.

I could watch the discard counter increase for each ping (show interface ethernet) and show ip arp statistics showed packet drops for  Non-local destination IP address (yes, they were local).

I don't know what triggers the bug and I haven't seen it since.

[MICHAEL NOACK]

Thanks Patrik

What i found out a couple of days ago, that this only happens in warp-mode. It seems that vPC is not really working in warp mode. After several reboots, removing cables and so on  i gave up and swicthed back to Normal mode and from then it works fine, even with the newest nx-os version. I will open a TAC case...