Bug ID 691992: MSTP: CIST bridge priority changes after adjusting the MSTI priority.

Last Modified: Jan 24, 2019

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4

Opened: Nov 01, 2017
Severity: 3-Major

Symptoms

Changing the priority of a non-zero region MSTP instance results in BPDUs advertising a change to the CIST Bridge Priority, but not for the expected MSTID instance.

Impact

Changing the MSTID priority for forcing the BIG-IP system to become the root bridge, does not work as expected. Note: F5 Networks recommends against having the BIG-IP system become the root bridge.

Conditions

Issue a STP MSTID priority modify request.

Workaround

After modifying the MSTID priority, also restart the STP daemon (stpd) to have the BPDUs advertising the expected CIST/MSTID priorities.

Fix Information

None

Behavior Change