Border Gateway Protocol (BGP) Parameters 2026-01-06 The IETF will be the Change Controller for all future registrations. 1-63 IETF Review 64-238 First Come First Served 239-254 Experimental Use 0 Reserved IETF 1 Multiprotocol Extensions for BGP-4 IETF 2 Route Refresh Capability for BGP-4 IETF 3 Outbound Route Filtering Capability IETF 4 Multiple routes to a destination capability (deprecated) IETF 5 Extended Next Hop Encoding IETF 6 BGP Extended Message IETF 7 BGPsec Capability IETF 8 Multiple Labels Capability IETF 9 BGP Role IETF 10-63 Unassigned 64 Graceful Restart Capability IETF 65 Support for 4-octet AS number capability IETF 66 Deprecated (2003-03-06) IETF 67 Support for Dynamic Capability (capability specific) IETF 68 Multisession BGP Capability IETF 69 ADD-PATH Capability IETF 70 Enhanced Route Refresh Capability IETF 71 Long-Lived Graceful Restart (LLGR) Capability IETF 72 Routing Policy Distribution IETF 73 FQDN Capability IETF 74 BFD Strict-Mode Capability IETF 75 Software Version Capability IETF 76 PATHS-LIMIT Capability IETF 77 Link-Local Next Hop Capability IETF 78 Edge Metadata Capability (TEMPORARY - registered 2025-05-06, expires 2026-05-06) IETF 79-127 Unassigned 128 Prestandard Route Refresh (deprecated) IETF 129 Prestandard Outbound Route Filtering (deprecated), prestandard Routing Policy Distribution (deprecated) IETF 130 Prestandard Outbound Route Filtering (deprecated) IETF 131 Prestandard Multisession (deprecated) IETF 132-183 Unassigned 184 Prestandard FQDN (deprecated) IETF 185 Prestandard OPERATIONAL message (deprecated) IETF 186-238 Unassigned 239-254 Reserved for Experimental Use IETF 255 Reserved IETF IETF Review 0 Provider 1 RS 2 RS-Client 3 Customer 4 Peer (i.e., Lateral Peer) 5-255 Unassigned