Bug ID 769741: TCP connection between mcp and tmm may get stalled

Last Modified: Sep 29, 2022

Bug Tracker

Affected Product:  See more info
BIG-IP TMOS(all modules)

Known Affected Versions:
15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2, 15.0.1.3, 15.0.1.4, 15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7

Opened: Apr 05, 2019
Severity: 3-Major

Symptoms

TMM may get stuck at start-up and does not transition to ready state.

Impact

TMM does not complete startup, getting stuck on cmp_mpi. Traffic disrupted while tmm is offline.

Conditions

The exact conditions remain unknown, however, the likelihood of this occurring increases with the number of TMMs.

Workaround

1. Make the following modifications to profile tcp _mcptcp in /usr/lib/tmm/tmm_base.tcl: Change this: rcvwnd 4194304 To this: rcvwnd 131072 2. To apply the changes, run the following command: bigstart restart tmm

Fix Information

None

Behavior Change