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

Last Modified: Nov 07, 2022

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,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6

Opened: Nov 01, 2017
Severity: 3-Major


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.


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.


Issue a STP MSTID priority modify request.


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

Fix Information


Behavior Change