Last Modified: Oct 06, 2020
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Known Affected Versions:
Opened: Apr 23, 2014
Related AskF5 Article: K16399
TMM can crash if the cloned pool doesn't support TCP segmentation offload (TSO), but receives a packet that is marked for TSO.
Traffic disrupted while tmm restarts.
If a virtual is configured with a clone pool, the original flow supports TSO and the cloned pool doesn't not support TSO, then a packet received on the original flow and is marked for TSO can cause a TMM crash when sent to the clone pool member.
To workaround this issue disable TSO. This can be done by modifying the DB variable tm.tcpsegmentationoffload: tmsh modify sys db tm.tcpsegmentationoffload value disable