Bug ID 1006449: The default size of the subagent object cache may lead to slow SNMP response time and high mcpd CPU use

Last Modified: May 02, 2024

Affected Product(s):
BIG-IP Install/Upgrade, TMOS(all modules)

Known Affected Versions:
15.1.0,,,,,, 15.1.1, 15.1.2,, 15.1.3,, 15.1.4,, 15.1.5,, 15.1.6,, 15.1.7, 15.1.8,,, 15.1.9,, 15.1.10,,,, 16.1.2,,, 16.1.3,,,,,, 16.1.4,,,, 17.0.0,,, 17.1.0,,,, 17.1.1,,,

Opened: Mar 25, 2021

Severity: 2-Critical


After upgrading from a 13.1.x release to a later release (such as 15.1.x), BIG-IP CPU utilization increases and SNMP is slow to respond.


SNMP queries take an unusually long time to return data, and BIG-IP CPU utilization is higher.


SNMP client repeatedly polls BIG-IP for OIDs in multiple tables over a short period of time.


To the file /config/snmp/bigipTrafficMgmt.conf, add one line with the following content: cacheObj 16 This could be accomplished by executing the following command line from bash: # echo "cacheObj 16" >> /config/snmp/bigipTrafficMgmt.conf After the above config file has been modified and saved, the "snmpd" daemon must be restarted, using one of two command variants: (on a BIG-IP appliance or VE system) # bigstart restart snmpd (on a a multi-slot VIPRION or vCMP guest) # clsh bigstart restart snmpd (However, this adjustment will be lost when the BIG-IP software is next upgraded.)

Fix Information


Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips