The MPLS Traffic Engineering (TE)--Fast Reroute (FRR) Link and Node Protection feature provides link protection (backup tunnels that bypass only a single link of the label-switched path (LSP)), node protection (backup tunnels that bypass next-hop nodes along LSPs), and the following FRR features:
·Backup tunnel support
·Backup bandwidth protection
·Resource Reservation Protocol (RSVP) Hellos

Prerequisites for MPLS Traffic Engineering (TE)--Fast Reroute (FRR) Link and Node Protection

Your network must support the following Cisco IOS features:
·IP Cisco Express Forwarding
·Multiprotocol Label Switching (MPLS)

Your network must support at least one of the following protocols:
·Intermediate System-to-Intermediate System (IS-IS)
·Open Shortest Path First (OSPF)

Before configuring FRR link and node protection, it is assumed that you have done the following tasks but you do not have to already have configured MPLS TE tunnels:
·Enabled MPLS TE on all relevant routers and interfaces ·Configured MPLS TE tunnels