Overview
A redundancy group allows traffic to enter and leave an IRF fabric through the same member device, as shown in Figure 30.
Figure 30: Redundancy group application scenario (in IRF mode)
A redundancy group has two redundancy group nodes. Each node is bound to an IRF member device. The redundancy group contains members that are on the bound IRF member devices. The members include Reth interfaces and interfaces of the IRF member devices.
A redundancy group node is a collection of objects on its bound IRF member device. The objects include member interfaces of Reth interfaces and member interfaces of the redundancy group. The state of the objects is consistent with the state of the node.
In a redundancy group, one node is in primary state, and the other node is in secondary state. Only the primary node forwards traffic. When the primary node fails, the redundancy group switches over to the secondary node. This mechanism ensures path symmetry for traffic.
If an IRF fabric contains more than two member devices, you can configure multiple independent redundancy groups. The node state and switchovers in a redundancy group does not affect another redundancy group.