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Cisco Bug: CSCta39604 - MST sends BPDUs at high rate

Last Modified

Feb 22, 2014

Products (72)

  • Cisco Catalyst 3750 Series Switches
  • Cisco ME 3400-24TS-A Switch
  • Cisco Catalyst 3560E-24TD-S Switch
  • Cisco Catalyst 3560E-48PD-SF Switch
  • Cisco Catalyst 3560E-48PD-E Switch
  • Cisco Catalyst 3560G-48PS Switch
  • Cisco Catalyst 3560E-12D-E Switch
  • Cisco Catalyst 2960G-24TC-L Switch
  • Cisco Catalyst 2960-24TC-L Switch
  • Cisco Catalyst 2960-24-S Switch
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Known Affected Releases


Description (partial)


BPDU are generated on high rate (limited by tx_hold) even network STP is stable and converged correctly and there is no TCN)


This is happen only with MST in ring type topologies when there is more than 1 MST instance and 2 instances use different path in ring to root.
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