Bug ID 817085: Multicast Flood Can Cause the Host TMM to Restart

Last Modified: Sep 13, 2023

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

Known Affected Versions:
12.1.4,, 12.1.5,,

Fixed In:
15.1.0, 14.1.4,

Opened: Aug 22, 2019

Severity: 2-Critical


A vCMP host tmm is restarted.


The host TMM restarts and traffic stops for the guests.


The vCMP host is processing heavy multicast traffic.


An adjustment to the scheduling can be made by this setting of the vCMP Host configuration: # echo "realtime yield 90" > /config/tmm_init.tcl # bigstart restart tmm The bigstart restart tmm must be performed individually on all blades on the vCMP host. These changes also must be done on all vCMP hosts with guests in a high availability (HA) setup.

Fix Information

The host TMM no longer restarts.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips