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Cisco Bug: CSCup85325 - OTV vlans go through active to inact to active after 2nd RP switchover

Last Modified

Oct 29, 2014

Products (25)

  • Cisco IOS
  • Cisco ASR 901-6CZ-FS-D Router
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ASR 901S-4SG-F-D Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ASR 901S-2SG-F-D Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901S-2SG-F-AH Router
  • Cisco ASR 901-6CZ-FT-A Router
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Known Affected Releases

15.4(3)S

Description (partial)

Symptom:
On second switchover, all overlays go down and come back up again which in turn causes the vlans to transition from active to inactive to active

Conditions:
This behaviour is observed on the second switchover. After the first switchover, the new back up comes with a different MAC address from the active. When the switchover happens for the second time and the backup takes over, ISIS loses adjacencies with all its neighbors since the MAC has changed. Losing adj causes the overlays to flap. Once adj is established with the new MAC, overlay is brought up again. This issue exists in the previous release as well.

This causes traffic loss as all the overlays go down and come back up again.
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