Bug ID 589338: Linux host may lose dynamic routes on secondary blades

Last Modified: Dec 10, 2018

Bug Tracker

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

Known Affected Versions:
11.4.0, 11.4.1, 11.5.0, 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, 11.5.6, 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

Fixed In:
11.6.3.2, 11.5.7

Opened: Apr 25, 2016
Severity: 3-Major
Related AskF5 Article:
K86536930

Symptoms

The Linux host residing on a secondary blade might lose dynamic routes previously learned via a dynamic routing protocol.

Impact

Routes on Linux host of secondary blade are lost. This might affect host traffic, such as monitoring, remote logging, etc., due to the lack of routing information.

Conditions

- Multibladed chassis or vCMP guest. - Routes learned via dynamic routing. - Restart of services or reboot of secondary blade.

Workaround

Modify the ZebOS maximum-paths setting on the primary blade to trigger a route update to the non-primary blades. Add a custom alert to the user_alert.conf to auto-mitigate this issue whenever a blade joins the cluster. # 11.5.x workaround for user_alert.conf alert BLADE_JOINED_CLUSTER "010719fc:5: Mate cluster member (.*) turned Green." { exec command="/usr/sbin/zebos -a cmd 'enable,conf t,maximum-paths 5,maximum-paths 4,exit,exit'" } Note: The Mate cluster log is not present in 11.6.x, so this an 11.5.x only workaround.

Fix Information

This issue no longer occurs, so there is consistency among blades.

Behavior Change