Cisco Bug: CSCvv16597 - Upgrading to 16.9.5 breaks the xconnect functionality of forwarding Superior BPDUs in ASR1002-X
Jul 31, 2020
- Cisco ASR 1000 Series Aggregation Services Routers
Known Affected Releases
Symptom: ASR1002-X not forwarding Superior STP BPDUs after upgrade to 16.9.5 Issue not seeing in version 03.16.10.S When upgrading ASR1002-X to 16.9.5, the ASR1002-X stops forwarding Superior BPDU towards the MPLS cloud. Other control plane layer 2 protocols such as CDP, LACP, STP (Inferior BPDUs) are not affected. This causes the 6500-1 to not communicate with 6500-2 in the STP domain, and port goes into P2P Dispute. Topology ROOT 6500-1 ---ASR1002-X--------MPLS Cloud -----ASR1001 ----6500-2 Conditions: Use old legacy xconnect commands on the ASRs. i.e: ! interface GigabitEthernet0/0/1 mtu 9000 no ip address negotiation auto cdp enable xconnect x.x.x.x x encapsulation mpls end Root bridge of STP should be connected to the ASR1002-X.
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