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

Last Modified: Sep 13, 2023

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
12.1.2, 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, 12.1.4.1, 12.1.5, 12.1.5.1, 12.1.5.2, 12.1.5.3, 12.1.6

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

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips