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Cisco Bug: CSCur39933 - asr9k MST forwards TCN in periodic BPDU only

Last Modified

May 09, 2018

Products (7)

  • Cisco ASR 9000 Series Aggregation Services Routers
  • Cisco ASR 9922 Router
  • Cisco ASR 9010 Router
  • Cisco ASR 9904 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases

3.7.0.BASE

Description (partial)

Symptom:
When an asr9k running MST receives TCN from a downstream switch, the TCN is only forwarded when the next periodic BPDU ticks.

Conditions:
Simple L2 topology running MST spanning-tree.
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