R3303-HP HSR6800 Routers IRF Configuration Guide

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IRF merge
IRF merge occurs when two split IRF fabrics reunite or when you configure and connect two independent
IRF fabrics to be one, as shown in Figure 5.
Figure 5 IRF merge
Member priority
Member priority determines the possibility of a member device to be elected the master. A member with
higher priority is more likely to be elected the master.
The default member priority is 1. You can change the member priority of a member device to affect the
master election result.
Master election
Master election is held each time the IRF fabric topology changes, for example, when the IRF fabric is
established, the master device fails or is removed, the IRF fabric splits, or IRF fabrics merge. Master
election does not occur when two split IRF fabrics merge.
Master election uses the following rules in descending order:
1. Current master, even if a new member has higher priority.
When an IRF fabric is being formed, all member devices consider themselves as the master, and
this rule is skipped.
2. Member with higher priority.
3. Member with the longest system uptime.
4. Member with the lowest bridge MAC address.
The IRF fabric is formed on election of the master.
During an IRF merge, the devices of the IRF fabric that fails the master election must reboot to rejoin the
IRF fabric that wins the election. The reboot can be automatically performed or manually performed,
depending on the configuration. See "Enabling IRF auto merge."
A
fter a master election, all subordinate devices reboot with the configuration on the master. Their original
configuration, even if it has been saved, does not take effect. The configuration files on these subordinate
devices do not take effect in IRF mode. After the operating mode is converted to standalone, their
configuration files continue to take effect.
IRF link
XGE1/3/0/1
XGE2/3/0/1
Device A Device B
Device A
Device B
IRF 1
IRF 2
IRF
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