BGP fast reroute is a feature that brings together indirection techniques in the forwarding plane and precomputation of BGP backup paths in the control plane to support fast reroute of BGP traffic around unreachable/failed next-hops. In a VPRN context BGP fast reroute is supported using VPN-IPv4 and VPN-IPv6 VPN routes. The supported VPRN scenarios are described in the following table.
| Ingress packet | Primary route | Backup route | Prefix independent convergence |
|---|---|---|---|
IPv4 (ingress PE) |
VPN-IPv4 route with next-hop A resolved by a LDP, RSVP or BGP tunnel |
VPN-IPv4 route with next-hop A resolved by a LDP, RSVP or BGP tunnel |
Yes |
IPv6 (ingress PE) |
VPN-IPv6 route with next-hop A resolved by a LDP, RSVP or BGP tunnel |
VPN-IPv6 route with next-hop B resolved by a LDP, RSVP or BGP tunnel |
Yes |