Bug ID 487757: Hybrid higig/front panel port packet discard (Ingress back-pressure v.s. Egress queue discard) counts can be expected during bursty or severe MMU traffic congestion on B4300/B2200/10000/12000-family platforms.

Last Modified: Jul 13, 2024

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.1 HF10, 11.5.1 HF11, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 11.5.4, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.5.10, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4

Fixed In:
11.6.0 HF5

Opened: Oct 30, 2014

Severity: 3-Major


Different discard configurations as set on B4300/B2200/10000/12000-family platform interfaces, may result in different packet discard type counts, when the switch encounters bursty or severe MMU congestion.


When switch ports encounters congestion, ports supporting extended unicast queue ports may show ingress back-pressure discard counts, as opposed to egress queue discard counts for ports supporting regular unicast queue ports.


Dissimilar congestion discard counts observed for switch ports supporting normal v.s. extended unicast queues.



Fix Information

Enabled egress CoS queue discard settings also for switch ports supporting extended unicast queues, as currently set for ports supporting normal unicast queues.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips