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Question 122

A failover event is recorded in the log messages:

Jan 01 00:00:50 BIG-IP notice sod[5855]: 01140029:5: HA proc_running tmm fails action is go offline and down links.

Jan 01 00:00:50 BIG-IP notice sod[5855]: 010c0050:5: Sod requests links down.

Jan 01 00:00:50 BIG-IP notice sod[5855]: 010c0054:5: Offline for traffic group /Common/traffic-group-1.

Jan 01 00:00:50 BIG-IP notice sod[5855]: 010c003e:5: Offline

Jan 01 00:00:50 BIG-IP notice logger: /usr/bin/tmipsecd --tmmcount 4 ==> /usr/bin/bigstart stop racoon

Jan 01 00:00:50 BIG-IP info lacpd[5502]: 01160016:6: Failover event detected. (Switchboard failsafe disabled while offline)

Jan 01 00:00:51 BIG-IP err bcm56xxd[5296]: 012c0010:3: Failover event detected. Marking external interfaces down. bsx.c(3633)

Jan 01 00:00:51 BIG-IP info bcm56xxd[5296]: 012c0015:6: Link: 1.1 is DOWN

Jan 01 00:00:56 BIG-IP notice mcpd[5318]: 0107143c:5: Connection to CMI peer 10.0.0.3 has been removed

Jan 01 00:00:56 BIG-IP notice mcpd[5318]: 0107143a:5: CMI reconnect timer: enabled

Jan 01 00:00:56 BIG-IP notice mcpd[5318]: 01071431:5: Attempting to connect to CMI peer 10.0.0.3 port 6699

What is the cause of the failover?

    Correct Answer: B

    The log messages clearly indicate that the Traffic Management Microkernel (TMM) failed, as seen in the message 'proc_running tmm fails action is go offline and down links.' The Switch Over Daemon (sod) then initiates a failover due to this failure. This sequence of events points to the system fail-safe being triggered by the TMM failure.

Discussion
GVKDOption: B

B - Correct TMM Failed causing sod to trigger a failover. sod process: The switch over daemon detects fail-safe conditions on the BIG-IP system by monitoring the HA table and initiating the fail-safe action based on the condition it finds. The BIG-IP system uses the following sequence to enable and disable the external interfaces, monitor the HA table, and facilitate failover: During startup, the system forces the external interfaces down until the required connections to the sod process are established. -The sod process monitors the HA table to verify the status of TMM instances. -The bcm56xxd and lacpd processes attempt to connect to the sod process over TCP port 1030. -Assuming the TMM instances are available, the sod process allows the connections from the bcm56xxd and lacpd processes. Note: If TMM instances are unavailable, the sod process denies the connections and initiates a failover. https://my.f5.com/manage/s/article/K95002127