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Cisco Bug: CSCvs93150 - Doc: ASA Lina BPDU handling in transparent BVI warning missing

Last Modified

Apr 15, 2020

Products (1)

  • Cisco ASA 5500-X Series Firewalls

Known Affected Releases

9.12(3)

Description (partial)

Symptom:
This is an enhancement request to include warning in documentation about possible impact on Spanning Tree Root Bridge election process in deployments, where interfaces from different vlans are bridged by transparent firewall.

In case of assigning interfaces from different VLANs to same bridge group, BPDUs from one VLAN will be visible in another (this is expected behavior, as firewall is just passing them through) - this might cause problems with STP root bridge election process. In such cases, enabling bdpufilter on switch interface can be used to resolve the problem.

Conditions:
Transparent BVI bridging interfaces from different vlans and per vlan STP BPDUs passing through those interfaces.
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