Bug ID 655649: BGP last update timer incorrectly resets to 0

Last Modified: Apr 28, 2025

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

Known Affected Versions:
11.5.4, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.5.5, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 11.6.5, 11.6.5.1, 11.6.5.2, 11.6.5.3, 12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 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, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3

Fixed In:
13.1.0, 13.0.1, 12.1.3, 11.5.6

Opened: Apr 06, 2017

Severity: 3-Major

Related Article: K88627152

Symptoms

In ZebOS, every time the scan timer resets it also incorrectly resets the BGP last update timer as shown under the imish command 'sh ip route'. Output from 'sh ip route': 4054fdc0-3e51-4079-b52f-4a3b058a3f93#sh ip ro ... B 10.30.0.0/16 [20/0] via 10.10.1.2, eno33554952, 00:00:32 [20/0] via 10.10.1.6, eno33554952, 00:00:32 ... 4054fdc0-3e51-4079-b52f-4a3b058a3f93#sh ip ro ... B 10.30.0.0/16 [20/0] via 10.10.1.2, eno33554952, 00:00:33 [20/0] via 10.10.1.6, eno33554952, 00:00:33 ... 4054fdc0-3e51-4079-b52f-4a3b058a3f93#sh ip ro ... B 10.30.0.0/16 [20/0] via 10.10.1.2, eno33554952, 00:00:00 <<<< shouldn't reset [20/0] via 10.10.1.6, eno33554952, 00:00:00

Impact

If BGP routes are being redistributed into other protocols, the route may flap in the destination process.

Conditions

Once ZebOS has learned a route from a BGP peer the route will show up under 'sh ip route' and the BGP last update timer will incorrectly reset.

Workaround

None.

Fix Information

BIG-IP no longer resets the last update time of learned routes via BGP and BGP routes redistributed into other protocols no longer flap.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips