When will the switches in an IRF stack compete to become the Master?
A. when a Slave is configured with a higher priority and restarted
B. when a new device with the highest Master priority joins an existing IRF stack
C. when an IRF virtual device is partitioned due to link failure
D. when a device other than the Master leaves the IRF stack
Correct Answer: C
Explanation/Reference:
HP 5820X & 5800 Switch Series IRF Configuration Guide
Master election
Master election is held each time the topology changes, for example, when the IRF virtual device is established, a new member switch is plugged in, the master switch fails or is removed, or the partitioned IRF virtual devices merge.
The master is elected based on the following rules in descending order:
1. The current master, even if a new member has a higher priority. When an IRF virtual device is being formed, all member switches consider them selves as the master, this rule is skipped.
2. The member with a higher priority.
3. The member with the longest system up-time. The member switches exchange system up-time in the IRF hello packets.
4. The member with the lowest bridge MAC address
The IRF virtual device is formed on election of the master.
During an IRF merge, the switches of the IRF virtual device that fails the master election automatically reboot to join the IRF virtual device that wins the election.
After a master election, all subordinate member switches initialize and reboot with the configuration on the master, and their original configuration, even if has been saved, is lost.
http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c02648772/c02648772.pdf
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