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Cisco Bug: CSCur91280 - N5k mst interop with cat6k: 30 sec convergece after TCN

Last Modified

Feb 22, 2018

Products (7)

  • Cisco Nexus 5000 Series Switches
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 6004 Switch
  • Cisco Nexus 6001 Switch
  • Cisco Nexus 5548UP Switch
  • Cisco Nexus 5596T Switch

Known Affected Releases


Description (partial)

+30sec MSTP convergence due to slow MSTP state transition

In MSTP during a proposal handshake, a port in ALT BLK does not send a BPDU with the agreement flag set. 

This cause the port on other end to go through blocking and learning states.

Problem is observed every time when there is change in topology.
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