Bug ID 440959: SNMP DCA monitor reject delayed responses with ICMP unreachable result.

Last Modified: Apr 10, 2019

Bug Tracker

Affected Product:  See more info
BIG-IP LTM(all modules)

Known Affected Versions:
11.0.0, 11.1.0, 11.2.0, 11.2.1, 11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 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, 11.5.2, 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, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3, 12.1.3.1, 12.1.3.2, 12.1.3.3, 12.1.3.4, 12.1.3.5, 12.1.3.6, 12.1.3.7, 12.1.4, 12.1.4.1

Opened: Dec 17, 2013
Severity: 3-Major

Symptoms

SNMP DCA monitor reject delayed responses with ICMP unreachable result. Within the threshold of configured timeout and retry, in the event of an ICMP unreachable, the monitor marks the weight to the default (1).

Impact

Delayed SNMP responses are rejected by the monitor.

Conditions

Configure a pool_member with SNMP_DCA monitor. Delay the SNMP server's response.

Workaround

Write an external monitor script, using the snmpget utility. For example: ------------ # values provided by bigd node_ip=`echo $1 | sed 's/::ffff://'` # example: use snmp get command=$(snmpget -v 2c -c private '$node_ip' -r 3 -t 5 .1.3.6.1.4.1.2021.4.5.0 .1.3.6.1.4.1.2021.4.6.0 .1.3.6.1.4.1.2021.11.50.0 .1.3.6.1.4.1.2021.11.51.0 .1.3.6.1.4.1.2021.11.52.0 .1.3.6.1.4.1.2021.11.53.0 .1.3.6.1.4.1.2021.9.1.2 .1.3.6.1.4.1.2021.9.1.9) To configure an external monitor: --------------------------------- -- tmsh create sys file external-monitor my_snmp_exec source-path file:/config/monitors/my_snmp2.sh. -- tmsh create ltm monitor external my_snmp run my_snmp_exec. -- tmsh create ltm node nodeA address 1.1.1.1 monitor my_snmp.

Fix Information

None

Behavior Change