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

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
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.
Bug Details Include
- Full Description (including symptoms, conditions and workarounds)
- Status
- Severity
- Known Fixed Releases
- Related Community Discussions
- Number of Related Support Cases