Redundant Interface Sets is a feature that allows us to have multiple interfaces connected but only one interface is active and the others are in standby mode. This enabled us to, for instance, have redundant network connections to different switches on, in case we want to have redundant NIC settings on NetScaler.
Unlike, for instance, LACP, where we need to configure the NetScaler and the peer device, this feature requires no configuration on the peer device. The only thing that the peer device needs to support is GARP broadcasts.
In case redundant interface sets are configured, only the active interface will accept traffic; the standby interface will drop any receiving traffic and will not send out any packets.
In case an active interface goes down, the second interface, which is based on a priority will broadcast a GARP containing its MAC address and where it is located, and will resume the traffic that was dropped from the primary interface.
Some important things...