Symptom

VPC leaf may suspend all its vpc links in a single threaded situation

Conditions

The following sequence of events could contribute to the issue 1. VPC leaf say leaf 101 is single threaded because the peer leaf 102 was decommissioned and removed from the controller 2. Another switch say leaf 103 with a completely different node ID (103) was commissioned after the above step and the TEP address released by leaf 102 is assigned to leaf 103. 3. leaf 103 becomes active and vpc leaf 101 suspends the vpc links due to compatibility failure since leaf 101 assumes that leaf 102 came online.

Workaround

Remove the vpc protection group which will bring up the links downstream.

Further Problem Description