Bug ID 945537: STP Validation for forward-delay, max-age, and hello-time fields

Last Modified: Nov 07, 2022

Bug Tracker

Affected Product:  See more info
F5OS Velos(all modules)

Known Affected Versions:
1.0.0, 1.0.0-420.0, 1.0.1

Fixed In:
1.2.0, 1.1.0

Opened: Sep 15, 2020
Severity: 3-Major

Symptoms

One or more forwarding-delay, max-age, or hello-time fields are configured and are not mirrored as operational data, or One or more forwarding-delay, max-age, or hello-time fields are configured, and the configuration is not reflected in the spanning-tree BPDUs.

Impact

Any configuration that does not match the expected formula will not propagate to spanning tree BPDUs.

Conditions

When configuring STP, use this formula for the forwarding-delay, max-age, and hello-time fields for STP, RSTP, and MSTP configurations: 2 * (hello-time + 1)) <= max-age && max-age <= (2 * (forwarding-delay - 1

Workaround

Configure the forward-delay, max-age, and hello-time fields using this formula: 2 * (hello-time + 1)) <= max-age && max-age <= (2 * (forwarding-delay - 1

Fix Information

Fixed an issue where a user could configure the forward-delay, max-age, and hello-time fields for STP so that the expected formula was not met. Entering an invalid configuration displays an error.

Behavior Change