Host fast reroute (HFRR)

This feature adds a precomputed protection path into the Packet Forwarding Engine, such that if a link between a provider edge device and a server farm becomes unusable for forwarding, the Packet Forwarding Engine can use another path without having to wait for the router or the protocols to provide updated forwarding information. HFRR is a technology that protects IP endpoints on multipoint interfaces, such as Ethernet. This technology is important in data centers where fast service restoration for server endpoints is critical. After an interface or a link goes down, HFRR enables the local repair time to be approximately 50 milliseconds. One can configure HFRR by adding the link-protection statement to the interface configuration in the routing instance. We recommend that you include this statement on all provider edge (PE) devices that are connected to server farms through multipoint interfaces.