Preview Tool

Cisco Bug: CSCvv34831 - L2 mcast vpls forwarding outage caused by rep ring changes

Last Modified

Sep 24, 2020

Products (1)

  • Cisco ASR 920 Series Aggregation Services Router

Known Affected Releases


Description (partial)

In multi REP rings environment,  topology changes experienced in one REP ring are causing mcast forwarding outages in other REP rings (not touched by the topology change)
The outage lasts for ~130s and then forwarding is automatically recovered.
The outage affects only mcast traffic - unicast communication is no affected.

Multicast forwarding issue observed 
- on ASR920 platform
- working as REP edge for multiple rings
- in case of ethernet service instance leveraging VPLS bridging services 
- issue observed when 16.9.3 and 16.12.4 is used
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.