Bug ID 935793: With mirroring enabled on a SIP virtual server, connections on the standby are reset with MBLB internal error (Routing problem)

Last Modified: Dec 20, 2023

Affected Product(s):
BIG-IP Install/Upgrade, LTM(all modules)

Known Affected Versions:,,,,,, 14.1.3,, 14.1.4,,,,,,, 14.1.5,,,,,, 15.0.0, 15.0.1,,,,, 15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,,, 15.1.9,, 15.1.10,,, 16.0.0,, 16.0.1,,, 16.1.0, 16.1.1, 16.1.2,,, 16.1.3,,,,,, 16.1.4,,

Opened: Aug 12, 2020

Severity: 3-Major


When a virtual server with a SIP profile has mirroring enabled, connections on the standby unit will be removed shortly after being created. If tm.rstcause.log is enabled the reset cause message appears similar to the following: -- err tmm1[18383]: 01230140:3: RST sent from to, [0x2c1c820:1673] MBLB internal error (Routing problem). -- err tmm1[18383]: 01230140:3: RST sent from to, [0x2c1c820:931] MBLB internal error.


Mirrored connections on the standby unit are removed.


-- BIG-IP Virtual Edition (VE) or 2000/4000 platforms using RSS hash. -- Platforms with more than 1 tmm.


-- On BIG-IP VE, add the following to tmm_init.tcl on both units and restart tmm: ndal ignore_hw_dag yes

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips