Last Modified: Dec 19, 2025
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
17.5.1.3
Opened: Dec 15, 2025 Severity: 3-Major
In some environments, during periods of high traffic, messages could build up in the TX internal queue due to xnet-DPDK being slow to inform that messages were sent. If this goes for long enough, the internal queue will fill up and become stuck.
Internal queue gets stuck preventing BIG-IP from being able to send messages and causing traffic disruption.
1) Using xnet-DPDK driver 2) Azure or Hyper-V 3) Sustained high (multi-GB/s) traffic rate
Create '/config/tmm_init.tcl' and add the following line ndal tx_iq_sz 1024 f5f5:f550 Afterwards, restart tmm with 'bigstart restart tmm' to apply change.
None