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

Last Modified: May 14, 2019

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,

Fixed In:, 11.5.7

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


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


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.


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


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