Bug ID 429773: Session Initiation Protocol (SIP) flow control enforcement issues

Last Modified: Jul 12, 2023

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

Known Affected Versions:
11.2.0, 11.2.1, 11.3.0, 11.4.0, 11.4.1

Fixed In:
11.5.0, 11.4.1 HF2, 11.4.0 HF6, 11.3.0 HF9, 11.2.1 HF11

Opened: Sep 04, 2013

Severity: 3-Major

Related Article: K15704

Symptoms

When using Session Initiation Protocol (SIP) and Message-based Load Balancing (MBLB) and TCP/TLS you may encounter memory issues, due to ineffective flow control. When remote client/server drains much slower than the rate of messages queued for them, the pending messages could use more memory than necessary.

Impact

TMM could get into aggressive memory sweeper, often

Conditions

SIP configured in a MBLB profile.

Workaround

Increase the count of server-side connections to distribute messages.

Fix Information

The mblb profile's egress settings could control the egress pending Q size and prevents it from growing to a size that impacts performance of other connections.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips