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Cisco Bug: CSCuq39843 - Any IPv6 traffic received on a STP blocking port is punted to CPU

Last Modified

Nov 27, 2020

Products (186)

  • Cisco Catalyst 3750-X Series Switches
  • Cisco Catalyst 2960C-12PC-L Switch
  • Cisco Catalyst 3560X-48U-S Switch
  • Cisco Catalyst 3560G-48PS Switch
  • Cisco Catalyst 3560E-24TD-S Switch
  • Cisco Catalyst 3560X-48P-S Switch
  • Cisco Catalyst 2960C-8TC-S Switch
  • Cisco Catalyst 2960-24TC-L Switch
  • Cisco Catalyst 3750V2-24PS Switch
  • Cisco ME 3400-24TS-A Switch
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Known Affected Releases

12.2(58)SE2 15.0(2)SE6

Description (partial) 

Symptom:
On 3750X platform, a port that is spanning tree blocking will punt any IPv6 traffic to CPU for processing.

Conditions:
3750X with spanning tree enabled
IPv6 traffic on the network
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Bug Details Include

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  • Status
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