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Cisco Bug: CSCun11927 - OAM not working after link flap between 4500X and ASR9K

Last Modified

Feb 01, 2018

Products (1)

  • Cisco Catalyst 4000 Series Switches

Known Affected Releases

15.1(2)SG

Description (partial)

Symptom:Link-OAM breaks after link flap between the Cisco Catalyst 4500-X Series Switch and the Cisco ASR 9000 Series Router. With an interface with LACP + Link-OAM configuration when the connection between the Catalyst 4500-X Series Switch(IOS XE) and Cisco ASR 9000 Series Router(IOS XR) flaps, the link does not restore due to the following deadlock :
LACP PDU does not start unless OAM starts on the Cisco ASR 9000 Series Router side and Link-OAM PDU does not start unless LACP starts on the Catalyst 4500-X Series Switch side. 

With the above scenario after a link flap the link gets stuck in (suspended) LACP state on the Catalyst 4500-X Series Switch and non-connected state on Cisco ASR 9000 Series Router. The link has to be restored with manual reconfiguration in a particular sequence to avoid the above dead lock.

Conditions: This symptom occurs due to a combination of Link-OAM and LACP between a Catalyst 4500-X Series Switch and a Cisco ASR 9000 Series Router.
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