H3C Technologies H3C SecPath F5020 - Manual (Page 16)

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IRF split
IRF split occurs when an IRF fabric breaks up into multiple IRF fabrics because of IRF link failures, as
shown in Figure 4 . The split IRF fabrics operate with the same IP address. This situation causes routing
and forwarding problems on the network. To quickly detect a multi-active collision, configure BFD MAD.
To quickly detect a multi-active collision, configure a minimum of one MAD mechanism.
Figure 4 IRF split
IRF merge
IRF merge occurs when two split IRF fabrics reunite or when two independent IRF fabrics are united, 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.
Master election
Master election is held each time the IRF fabric topology changes in the following situations:
• The IRF fabric is established.
• The master device fails or is removed.
• The IRF fabric splits.
• Independent IRF fabrics merge.
NOTE:
Master election does not occur when two split IRF fabrics merge.
Master election uses the following rules in descending order: