Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.2.1, 11.3.0, 11.4.0
Fixed In:
11.5.0
Opened: May 20, 2013 Severity: 3-Major Related Article:
K14566
The High-Speed Bridge (HSB) can lock up in certain vlangroup configurations. HSB lock messages appear and the BIG-IP system eventually reboots, causing all traffic flows to be lost.
TMM goes down.
Large ping messages to get re-assembled but when vlangroup.flow.allocate is disabled, tmm can write whole big message to HSB and that messes up internal state.
Set vlangroup.flow.allocate to enabled with 11.4.0 you can limit bigger ICMP with dos.maxicmpframesize
ICMP messages are no longer reassembled when going through vlan group and original fragmentation is preserved.