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Cisco Bug: CSCua79779 - cat3k:Spanning Tree interop between MST0 & RSTP takes 6 secs to converge

Last Modified

Feb 01, 2017

Products (120)

  • Cisco IOS
  • Cisco Catalyst 3750V2-24FS Switch
  • Cisco Catalyst 3560E-24TD-S Switch
  • Cisco Catalyst 3750V2-24PS Switch
  • Cisco Catalyst 2960G-24TC-L Switch
  • Cisco ME 3400EG-2CS-A Switch
  • Cisco Catalyst 3560E-48PD-E Switch
  • Cisco Catalyst 2960-48TT-S Switch
  • Cisco Catalyst 3560X-48P-S Switch
  • Cisco Catalyst 2960-24TC-L Switch
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Known Affected Releases

12.2(58)SE2

Description (partial)

Symptom:Spanning Tree interop between MST0 and RSTP takes 6 seconds to converge

Conditions:with Cisco switch not being the root, there is a case where the 3rd party switch sends inferior BPDUs on the blocking port of Cisco's switch with Proposal bit ON, however, Cisco switch waits for 3 such BPDUs before responding with a better BPDU.
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