R3303-HP HSR6800 Routers IRF Configuration Guide

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IRF domain ID
One IRF fabric forms one IRF domain. IRF uses IRF domain IDs to uniquely identify IRF fabrics and prevent
IRF fabrics from interfering with one another.
As shown in Figure 3, D
evice A and Device B form IRF fabric 1, and Router A and Router B form IRF fabric
2. The fabrics have LACP MAD links between them. When a member device in one IRF fabric receives
an extended LACP packet for MAD, it looks at the domain ID in the packet to see whether the packet is
from the local IRF fabric or from a different IRF fabric. Then, the device can handle the packet correctly.
Figure 3 A network that comprises two IRF domains
IRF split
IRF split occurs when an IRF fabric breaks up into two or more IRF fabrics because of IRF link failures, as
shown in Figure 4.
The split IRF fabrics operate with the same IP address and cause routing and
forwarding problems on the network.
Figure 4 IRF split