HP 6125G HP 6125G & 6125G/XG Blade Switches IRF Configuration Guide-R2 - Page 7

Physical IRF port, IRF domain ID, IRF split, Switch A and Switch B form IRF fabric 1

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For two neighboring devices, their IRF physical links must be bound to IRF-port 1 on one device and to IRF-port 2 on the other. Physical IRF port Physical IRF ports connect IRF member devices and must be bound to an IRF port. They forward IRF protocol packets between IRF member devices and data packets that must travel across IRF member devices. For more information about physical ports that can be used for IRF links, see "General restrictions and configuration guidelines." 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 2, Switch A and Switch B form IRF fabric 1, and Switch C and Switch D form IRF fabric 2. The fabrics have LACP MAD detection links between them. When a member switch in one IRF fabric receives an extended LACP packet for MAD detection, 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 switch can handle the packet correctly. Figure 2 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 3. The split IRF fabrics operate with the same IP address and cause routing and 3

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For two neighboring devices, their IRF physical links must be bound to IRF-port 1 on one device and to
IRF-port 2 on the other.
Physical IRF port
Physical IRF ports connect IRF member devices and must be bound to an IRF port. They forward IRF
protocol packets between IRF member devices and data packets that must travel across IRF member
devices.
For more information about physical ports that can be used for IRF links, see "
General restrictions and
configuration guidelines
."
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 2
, Switch A and Switch B form IRF fabric 1, and Switch C and Switch D form IRF fabric
2. The fabrics have LACP MAD detection links between them. When a member switch in one IRF fabric
receives an extended LACP packet for MAD detection, 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 switch can handle
the packet correctly.
Figure 2
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 3
. The split IRF fabrics operate with the same IP address and cause routing and