BGP fast reroute uses indirection techniques in the forwarding plane and BGP backup path precomputation in the control plane to support the fast reroute of BGP traffic around unreachable or failed BGP next hops. BGP fast reroute is supported for label-IPv4, VPN-IPv4, and VPN-IPv6 routes. For information about BGP fast reroute in a VPRN, see BGP fast reroute in a VPRN.
The following table describes the scenarios supported in the base router BGP context.
Ingress packet |
Primary route |
Backup route |
PIC |
|---|---|---|---|
IPv4 |
IPv4 route with next-hop A resolved by an IPv4 route or any shortcut tunnel |
IPv4 route with next-hop B resolved by an IPv4 route or any shortcut tunnel |
No |
IPv4 |
Label-IPv4 route with next-hop A resolved by any transport tunnel |
Label-IPv4 route with next-hop B resolved by any transport tunnel |
Yes |
IPv4 |
Label-IPv4 route with next-hop A resolved by a local route |
Label-IPv4 route with next-hop B resolved by a local route |
Yes |
IPv4 |
Label-IPv4 route with next-hop A resolved by a static route |
Label-IPv4 route with next-hop B resolved by a static route |
Yes |