BGP Label Route Resolution Using Segment Routing Tunnel

The user enables the resolution of RFC 3107 BGP label route prefixes using SR tunnels to BGP next-hops in TTM with the following command:

config>router>bgp>next-hop-resolution
        — labeled-routes
            — transport-tunnel
                — [no] family {label-ipv4 | label-ipv6 | vpn}
                    — resolution {any | disabled | filter}
                    — resolution-filter
                        — [no] sr-isis
                        — [no] sr-ospf
                    — exit
                — exit
            — exit
        — exit

When the resolution option is explicitly set to disabled, the default binding to LDP tunnel resumes. If resolution is set to any, any supported tunnel type in BGP label route context is selected following TTM preference.

The following tunnel types are supported in a BGP label route context and in order of preference: RSVP, LDP, and Segment Routing.

When the sr-isis or sr-ospf is specified using the resolution-filter option, a tunnel to the BGP next-hop is selected in the TTM from the lowest numbered IS-IS or OSPF instance.

See the BGP chapter for more details.