Protocol-ID,NLRI information source protocol,Reference
0,Reserved,[RFC9552]
1,IS-IS Level 1,[RFC9552]
2,IS-IS Level 2,[RFC9552]
3,OSPFv2,[RFC9552]
4,Direct,[RFC9552]
5,Static configuration,[RFC9552]
6,OSPFv3,[RFC9552]
7,BGP,[RFC9086]
8,RSVP-TE,[draft-ietf-idr-bgp-ls-te-path-01]
9,Segment Routing,[RFC-ietf-idr-bgp-ls-sr-policy-17]
10-199,Unassigned,
200-255,Private Use,[RFC9552]