Basic Automatic Protect Switching Overview
To set up a basic APS configuration, configure one interface to be the working circuit and a second to be the protect circuit. If you are using APS to protect against router failure, configure one interface on each router. If you are using APS to protect against FPC failure, configure two interfaces on the router, one on each FPC.
For each working–protect circuit pair, configure the following:
Group name—Creates the association between the two circuits. Configure the same group name for both the working and protect routers.
Authentication key—You configure this on both interfaces. Configure the same key for both the working and protect routers.
Address of the other interface on the other router—If you are configuring one router to be the working router and a second to be the protect router, you must configure the address of the remote interface. You configure this on one or both of the interfaces.
The address you specify for the neighbor must never be routed through the interface on which APS is configured, or instability will result. APS neighbor only applies to inter-router configurations. We strongly recommend that you directly connect the working and protect routers and that you configure the interface address of this shared network as the neighbor address.
The working and protect configurations on the routers must match the circuit configurations on the ADM; that is, the working router must be connected to the ADM’s working circuit and the protect router must be connected to the protect circuit.