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

Last Modified: Sep 06, 2019

Bug Tracker

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

Known Affected Versions:
11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 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, 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 AskF5 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