Bug ID 1025529: TMM generates core when iRule executes a nexthop command and SIP traffic is sent

Last Modified: Feb 07, 2024

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

Known Affected Versions:
15.1.2,, 15.1.3,, 15.1.4

Fixed In:

Opened: Jun 15, 2021

Severity: 3-Major


If an iRule uses the 'nexthop' command to select a VLAN for a virtual server, TMM may crash.


Traffic disrupted while TMM restarts.


-- Virtual server with SIP profile and iRule that executes a 'nexthop' command -- SIP network traffic occurs


Avoid using 'nexthop vlan' in an iRule in a SIP environment.

Fix Information

iRule creation does not cause any TMM core.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips