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Exam 301b All Questions

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Exam 301b topic 1 question 126 discussion

Actual exam question from F5's 301b
Question #: 126
Topic #: 1
[All 301b Questions]

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?

  • A. TMM failed, and VLAN fail-safe initiated the failover.
  • B. TMM failed, and system fail-safe initiated the failover.
  • C. Loss of connection to CMI peer 10.0.0.3 initiated the failover.
  • D. A switchboard failure caused system fail-safe to initiate the failover.
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Suggested Answer: B 🗳️
by GVKD at Feb. 12, 2024, 9:43 p.m.

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GVKD
4 months, 4 weeks ago
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
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