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Cisco Bug: CSCvi75081 - ACI: hardware mac entry incorrect for vpc interface after peer reloads

Last Modified

Jun 01, 2018

Products (1)

  • Cisco LAN Switch Software

Known Affected Releases

12.2(3r) 13.0(2h)

Description (partial)

Symptom:
Hardware is mis-programmed for an endpoint that is learned on a vPC interface while its peer is down. As an example, if leaf101 and leaf102 are a vPC pair, the problem is that leaf102 has programmed the host MAC behind the vPC interface without the isvpc flag, which changes the hardware macdainfo interface value.

To check for the issue, run the following command on leaf102:

#vsh_lc
# show platform internal hal objects ep l2entry extensions asic-unit  all | grep -A 20 -B 6  <mac address>
<snip>
      APD OBJECT EP SUGASICPDL2ENTRY
destisptr                                                 : 0x0
learninfo                                                 : 0x2
epghw                                                     : 0x2c56
fid                                                       : 0x1274
destidx                                                   : 0x49
isvpc                                                     : 0x0   <---------------------- interface is vPC, this should be set to 1

Conditions:
The trigger for this issue is as follows:
1) Reload the vPC peer.
2) While the vPC peer is down, learn the endpoint on the vPC interface.
3) When the vPC peer comes back online, the isvpc flag is not updated in hal.
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