Bug ID 614530: Dynamic ECMP routes missing from Linux host

Last Modified: Nov 07, 2022

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

Known Affected Versions:
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

Fixed In:
13.0.0, 12.1.2

Opened: Sep 05, 2016

Severity: 3-Major

Related Article: K03587067


When an ECMP route is learned via dynamic routing, it is not added to the Linux host and local processes may not be able to reach the destination prefix. Load balanced traffic is not affected.


Monitors may fail, other host-originated traffic may be sent out the wrong interface or nowhere at all.


Dynamic routing in use, ECMP configured, ECMP route received from neighbors.


Disable ECMP in ZebOS by setting "maximum-paths 1" in imish.

Fix Information

ECMP routes are correctly added to the Linux host.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips