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Cisco Bug: CSCvv45004 - NCS6K with CC Partitioned After CE Blue to Red VLAN Switchover

Last Modified

Sep 25, 2020

Products (1)

  • Cisco Network Convergence System 6000 Series Routers

Known Affected Releases

7.1.1.BASE

Description (partial)

Release-note

Symptom:
One a NCS6K router that is implemented using Compute Cards (CC) for external control plane (ECP) if there is a partial failure of the RP that is hosting the active Control Ethernet (CE) VLAN and there is a switchover to the other CE  VLAN as directed by MLAP (Minimal Loop Avoidance Protocol) the ECP may not immediately switch over.

If this happens the system can go to a partitioned state in which rack 0 and the ECPs are not connected to each other and rack 0 is marked as failed. When the control ethernet recovers the system comes up in in a state in which the ECP and line cards are unable to communicate properly with each other which affects all XR SDRs.

Conditions:
This issue is extremely rare and will not happen in the event of RPs that fail completely due to crash, reload, upgrade etc.
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