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Cisco Bug: CSCuj23131 - Bridging Loop with MST and FabricPath

Last Modified

Oct 23, 2019

Products (7)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7700 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch
  • Cisco Nexus 7700 10-Slot Switch

Known Affected Releases

6.2(2)

Description (partial)

Symptom:
Under the following conditions,  STP topology can converge without blocking where necessary leading to a bridging loop:
1. Spanning-tree mode MST containing multiple MST regions.
2. FabricPath leaf switches are in one MST region.
3. CE Switches are in a different MST region (than the FabricPath switches)
4. No FabricPath VLANs mapped to MST instance 0

Conditions:
The following conditions are necessary for this issue to be seen.

1. Spanning-tree mode MST containing multiple MST regions.
2. FabricPath leaf switches are in one MST region.
3. CE Switches are in a different MST region (than the FabricPath switches)
4. No FabricPath VLANs mapped to MST instance 0
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
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