Internet Assigned Numbers Authority

Border Gateway Protocol (BGP) Parameters

Last Updated
2024-12-20
Available Formats

XML
HTML
Plain text

Registries included below

BGP Message Types

Registration Procedure(s)
Standards Action
Reference
[RFC4271]
Available Formats

CSV
Value Name Reference
0 Reserved
1 OPEN [RFC4271]
2 UPDATE [RFC4271]
3 NOTIFICATION [RFC4271]
4 KEEPALIVE [RFC4271]
5 ROUTE-REFRESH [RFC2918]
6-255 Unassigned

BGP Path Attributes

Registration Procedure(s)
Standards Action
Reference
[RFC4271]
Available Formats

CSV
Value Code Reference
0 Reserved
1 ORIGIN [RFC4271]
2 AS_PATH [RFC4271]
3 NEXT_HOP [RFC4271]
4 MULTI_EXIT_DISC [RFC4271]
5 LOCAL_PREF [RFC4271]
6 ATOMIC_AGGREGATE [RFC4271]
7 AGGREGATOR [RFC4271]
8 COMMUNITIES [RFC1997]
9 ORIGINATOR_ID [RFC4456]
10 CLUSTER_LIST [RFC4456]
11 DPA (deprecated) [Chen, E., Bates, T., "Destination Preference Attribute for BGP", Work in progress, March 1996.][RFC6938]
12 ADVERTISER (historic) (deprecated) [RFC1863][RFC4223][RFC6938]
13 RCID_PATH / CLUSTER_ID (Historic) (deprecated) [RFC1863][RFC4223][RFC6938]
14 MP_REACH_NLRI [RFC4760]
15 MP_UNREACH_NLRI [RFC4760]
16 EXTENDED COMMUNITIES [Eric_Rosen][draft-ramachandra-bgp-ext-communities-00][RFC4360]
17 AS4_PATH [RFC6793]
18 AS4_AGGREGATOR [RFC6793]
19 SAFI Specific Attribute (SSA) (deprecated) [Gargi_Nalawade][draft-kapoor-nalawade-idr-bgp-ssa-00][draft-nalawade-idr-mdt-safi-00][draft-wijnands-mt-discovery-00]
20 Connector Attribute (deprecated) [RFC6037]
21 AS_PATHLIMIT (deprecated) [draft-ietf-idr-as-pathlimit]
22 PMSI_TUNNEL [RFC6514]
23 Tunnel Encapsulation [RFC9012]
24 Traffic Engineering [RFC5543]
25 IPv6 Address Specific Extended Community [RFC5701]
26 AIGP [RFC7311]
27 PE Distinguisher Labels [RFC6514]
28 BGP Entropy Label Capability Attribute (deprecated) [RFC6790][RFC7447]
29 BGP-LS Attribute [RFC9552]
30 Deprecated [RFC8093]
31 Deprecated [RFC8093]
32 LARGE_COMMUNITY [RFC8092]
33 BGPsec_Path [RFC8205]
34 BGP Community Container Attribute (TEMPORARY - registered 2017-07-28, extension registered 2024-08-22, expires 2025-07-28) [draft-ietf-idr-wide-bgp-communities-11]
35 Only to Customer (OTC) [RFC9234]
36 BGP Domain Path (D-PATH) (TEMPORARY - registered 2019-07-08, extension registered 2024-05-30, expires 2025-07-08) [draft-ietf-bess-evpn-ipvpn-interworking-10]
37 SFP attribute [RFC9015]
38 BFD Discriminator [RFC9026]
39 BGP Next Hop Dependent Capabilities (NHC) (TEMPORARY - registered 2022-12-20, extension registered 2024-12-10, expires 2025-12-20) [draft-ietf-idr-entropy-label-13]
40 BGP Prefix-SID [RFC8669]
41 BIER [RFC-ietf-bier-idr-extensions-19]
42-127 Unassigned
128 ATTR_SET [RFC6368]
129 Deprecated [RFC8093]
130-240 Unassigned
241 Deprecated [RFC8093]
242 Deprecated [RFC8093]
243 Deprecated [RFC8093]
244-254 Unassigned
255 Reserved for development [RFC2042]

BGP Error (Notification) Codes

Registration Procedure(s)
Standards Action
Reference
[RFC4271][RFC7313]
Available Formats

CSV
Value Name Reference
0 Reserved
1 Message Header Error [RFC4271]
2 OPEN Message Error [RFC4271]
3 UPDATE Message Error [RFC4271]
4 Hold Timer Expired [RFC4271]
5 Finite State Machine Error [RFC4271]
6 Cease [RFC4271]
7 ROUTE-REFRESH Message Error [RFC7313]
8 Send Hold Timer Expired [RFC9687]
9-255 Unassigned

BGP Error Subcodes

Registration Procedure(s)
Standards Action
Reference
[RFC4271]

Message Header Error subcodes

Registration Procedure(s)
Standards Action
Reference
[RFC4271]
Available Formats

CSV
Value Name Reference
0 Unspecific [RFC Errata 4493]
1 Connection Not Synchronized [RFC4271]
2 Bad Message Length [RFC4271]
3 Bad Message Type [RFC4271]
4-255 Unassigned

OPEN Message Error subcodes

Registration Procedure(s)
Standards Action
Reference
[RFC4271]
Available Formats

CSV
Value Name Reference
0 Unspecific [RFC Errata 4493]
1 Unsupported Version Number [RFC4271]
2 Bad Peer AS [RFC4271]
3 Bad BGP Identifier [RFC4271]
4 Unsupported Optional Parameter [RFC4271]
5 [Deprecated] [RFC4271]
6 Unacceptable Hold Time [RFC4271]
7 Unsupported Capability [RFC5492]
8 Deprecated [RFC9234]
9 Deprecated [RFC9234]
10 Deprecated [RFC9234]
11 Role Mismatch [RFC9234]
12-255 Unassigned

UPDATE Message Error subcodes

Registration Procedure(s)
Standards Action
Reference
[RFC4271]
Available Formats

CSV
Value Name Reference
0 Unspecific [RFC Errata 4493]
1 Malformed Attribute List [RFC4271]
2 Unrecognized Well-known Attribute [RFC4271]
3 Missing Well-known Attribute [RFC4271]
4 Attribute Flags Error [RFC4271]
5 Attribute Length Error [RFC4271]
6 Invalid ORIGIN Attribute [RFC4271]
7 [Deprecated] [RFC4271]
8 Invalid NEXT_HOP Attribute [RFC4271]
9 Optional Attribute Error [RFC4271]
10 Invalid Network Field [RFC4271]
11 Malformed AS_PATH [RFC4271]
12-255 Unassigned

BGP Finite State Machine Error Subcodes

Registration Procedure(s)
Standards Action
Reference
[RFC6608]
Available Formats

CSV
Value Name Reference
0 Unspecified Error [RFC6608]
1 Receive Unexpected Message in OpenSent State [RFC6608]
2 Receive Unexpected Message in OpenConfirm State [RFC6608]
3 Receive Unexpected Message in Established State [RFC6608]
4-255 Unassigned

BGP Cease NOTIFICATION message subcodes

Registration Procedure(s)
Standards Action or Early IANA Allocation process
Reference
[RFC4486]
Available Formats

CSV
Value Name Reference
0 Reserved
1 Maximum Number of Prefixes Reached [RFC4486]
2 Administrative Shutdown [RFC4486][RFC9003]
3 Peer De-configured [RFC4486]
4 Administrative Reset [RFC4486][RFC9003]
5 Connection Rejected [RFC4486]
6 Other Configuration Change [RFC4486]
7 Connection Collision Resolution [RFC4486]
8 Out of Resources [RFC4486]
9 Hard Reset [RFC8538]
10 BFD Down [RFC9384]
11-255 Unassigned

BGP ROUTE-REFRESH Message Error subcodes

Reference
[RFC7313]
Available Formats

CSV
Range Registration Procedures
0-127 Standards Action
128-255 First Come First Served
Value Name Reference
0 Reserved [RFC7313]
1 Invalid Message Length [RFC7313]
2-255 Unassigned

BGP Outbound Route Filtering (ORF) Types

Reference
[RFC5291]
Available Formats

CSV
Range Registration Procedures Note
0-63 Standards Action
64-127 First Come First Served
128-255 Vendor-Specific IANA does not assign
Value Description Reference
0 Reserved [RFC5291]
1-63 Unassigned
64 Address Prefix ORF [RFC5292]
65 CP-ORF [RFC7543]
66 VPN Prefix ORF [draft-ietf-idr-vpn-prefix-orf-06]
67-127 Unassigned
128-255 Reserved for Vendor-Specific [RFC5291]

BGP OPEN Optional Parameter Types

Registration Procedure(s)
IETF Review
Reference
[RFC5492]
Available Formats

CSV
Value Name Reference
0 Reserved [RFC5492]
1 Authentication (deprecated) [RFC4271][RFC5492]
2 Capabilities [RFC5492]
3-254 Unassigned
255 Extended Length [RFC9072]

BGP Tunnel Encapsulation Attribute Tunnel Types

Reference
[RFC9012]
Note
Moved to [https://www.iana.org/assignments/bgp-tunnel-encapsulation] per [RFC9012].

BGP Tunnel Encapsulation Attribute Sub-TLVs

Reference
[RFC9012]
Note
Moved to [https://www.iana.org/assignments/bgp-tunnel-encapsulation] per [RFC9012].

BGP Layer 2 Encapsulation Types

Reference
[RFC6624]
Note
When this registry is modified, the YANG module [iana-bgp-l2-encaps] must be updated 
as defined in [RFC9291].
Available Formats

CSV
Range Registration Procedures
0-127 Expert Review
128-251 First Come First Served
252-255 Experimental Use
Value Description Reference
0 Reserved [RFC6624]
1 Frame Relay [RFC4446]
2 ATM AAL5 SDU VCC transport [RFC4446]
3 ATM transparent cell transport [RFC4816]
4 Ethernet (VLAN) Tagged Mode [RFC4448]
5 Ethernet Raw Mode [RFC4448]
6 Cisco HDLC [RFC4618]
7 PPP [RFC4618]
8 SONET/SDH Circuit Emulation Service [RFC4842]
9 ATM n-to-one VCC cell transport [RFC4717]
10 ATM n-to-one VPC cell transport [RFC4717]
11 IP Layer 2 Transport [RFC3032]
12-14 Unassigned
15 Frame Relay Port mode [RFC4619]
16 Unassigned
17 Structure-agnostic E1 over packet [RFC4553]
18 Structure-agnostic T1 (DS1) over packet [RFC4553]
19 VPLS [RFC4761]
20 Structure-agnostic T3 (DS3) over packet [RFC4553]
21 Nx64kbit/s Basic Service using Structure-aware [RFC5086]
22-24 Unassigned
25 Frame Relay DLCI [RFC4619]
25-39 Unassigned
40 Structure-agnostic E3 over packet [RFC4553]
41 Octet-aligned payload for Structure-agnostic DS1 circuits [RFC4553]
42 E1 Nx64kbit/s with CAS using Structure-aware [RFC5086]
43 DS1 (ESF) Nx64kbit/s with CAS using Structure-aware [RFC5086]
44 DS1 (SF) Nx64kbit/s with CAS using Structure-aware [RFC5086]
45-127 Unassigned
128-251 Unassigned
252-255 Experimental Use [RFC6624]

BGP Layer 2 TLV Types

Reference
[RFC6624]
Available Formats

CSV
Range Registration Procedures
0-127 Expert Review
128-251 First Come First Served
252-255 Experimental Use
Value Description Reference
0 Reserved [RFC6624]
1 Circuit Status Vector [RFC6624]
2-127 Unassigned
128-251 Unassigned
252-255 Experimental Use [RFC6624]

BGP AIGP Attribute Types

Registration Procedure(s)
Standards Action
Reference
[RFC7311]
Available Formats

CSV
Value Description Reference
0 Reserved [RFC7311]
1 AIGP [RFC7311]
2-255 Unassigned

BGP Route Refresh Subcodes

Reference
[RFC7313]
Available Formats

CSV
Range Registration Procedures
0-127 Standards Action
128-254 First Come First Served
Value Code Reference
0 Route-Refresh [RFC2918][RFC5291]
1 BoRR [RFC7313]
2 EoRR [RFC7313]
3-254 Unassigned
255 Reserved [RFC7313]

P-Multicast Service Interface Tunnel (PMSI Tunnel) Tunnel Types

Reference
[RFC7385][RFC8317]
Note
The status of value 0xFF may only be changed through Standards Action [RFC8126].
Available Formats

CSV
Range Registration Procedures
0x00-0x7A IETF Review
0x7B-0x7E Experimental Use
0x80-0xFA Composite Tunnel
0xFB-0xFE Experimental Use
0xFF Standards Action
Value Meaning Reference
0x00 no tunnel information present [RFC6514]
0x01 RSVP-TE P2MP LSP [RFC6514]
0x02 mLDP P2MP LSP [RFC6514]
0x03 PIM-SSM Tree [RFC6514]
0x04 PIM-SM Tree [RFC6514]
0x05 BIDIR-PIM Tree [RFC6514]
0x06 Ingress Replication [RFC6514]
0x07 mLDP MP2MP LSP [RFC6514]
0x08 Transport Tunnel [RFC7524]
0x09 Unassigned
0x0A Assisted Replication Tunnel [RFC9574]
0x0B BIER [RFC8556]
0x0C SR-MPLS P2MP Tree (TEMPORARY - registered 2020-12-09, extension registered 2024-11-27, expires 2025-12-09) [draft-ietf-bess-mvpn-evpn-sr-p2mp-08]
0x0D-0x7A Unassigned
0x7B-0x7E Reserved for Experimental Use [RFC8317]
0x7F Reserved [RFC8317]
0x80-0xFA Reserved for Composite Tunnel [RFC8317]
0xFB-0xFE Reserved for Experimental Use [RFC7385]
0xFF wildcard transport tunnel type [RFC8338]

P-Multicast Service Interface (PMSI) Tunnel Attribute Flags

Registration Procedure(s)
Standards Action
Reference
[RFC7902]
Available Formats

CSV
Value Name Reference
0 Unassigned
1 Extension [RFC7902]
2 Leaf Information Required per-Flow (LIR-pF) [RFC8534]
3-4 Assisted Replication Type (T) [RFC9574]
5 Broadcast and Multicast (BM) [RFC9574]
6 Unknown (U) [RFC9574]
7 Leaf Information Required (L) [RFC6514]

BGP MCAST-VPN Route Types

Registration Procedure(s)
Standards Action
Reference
[RFC7441][RFC6514]
Note
Values may be assigned from one of several ranges:

 - Range 0x01-0x3f: Generic/PIM Range.  Values are assigned from
   this range when the NLRI format associated with the route type
   presupposes that PIM or IGMP is the C-multicast control protocol,
   or when the NLRI format associated with the route type is
   independent of the C-multicast control protocol.

 - Range 0x43-0x7f: mLDP Range.  Values are assigned from this range
   when the NLRI format associated with the route type presupposes
   that mLDP is the C-multicast control protocol.

 - Range 0x80-0xff: This range is reserved; values should not be
   assigned from this range.

In general, whenever an assignment is requested from this registry,
two codepoints should be requested at the same time: one from the
Generic/PIM range (0x01-0x3f) and one from the mLDP range (0x43-0x7f). 
The two codepoints should have the same low-order 6 bits.  If one of 
the two codepoints is not actually needed, it should be registered 
anyway, and marked as "Reserved."
Available Formats

CSV
Value Meaning Reference
0x00 Reserved [RFC7441][RFC6514]
0x01 Intra-AS I-PMSI A-D route [RFC7441][RFC6514]
0x02 Inter-AS I-PMSI A-D route [RFC7441][RFC6514]
0x03 S-PMSI A-D route [RFC7441][RFC6514]
0x04 Leaf A-D route [RFC7441][RFC6514]
0x05 Source Active A-D route [RFC7441][RFC6514]
0x06 Shared Tree Join route [RFC7441][RFC6514]
0x07 Source Tree Join route [RFC7441][RFC6514]
0x08-0x3f Unassigned (Generic/PIM range)
0x40-0x42 Reserved [RFC7441]
0x43 S-PMSI A-D route for C-multicast mLDP [RFC7441]
0x44 Leaf A-D route for C-multicast mLDP [RFC7441]
0x45-0x46 Reserved [RFC7441]
0x47 Source Tree Join route for C-multicast mLDP [RFC7441]
0x48-0x7f Unassigned (mLDP range)
0x80-0xff Reserved [RFC7441]

BGP Prefix-SID TLV Types

Registration Procedure(s)
Expert Review
Expert(s)
Acee Lindem, Hannes Gredler
Reference
[RFC8669]
Available Formats

CSV
Value Type Reference
0 Reserved [RFC8669]
1 Label-Index [RFC8669]
2 Deprecated [RFC8669]
3 Originator SRGB [RFC8669]
4 Deprecated [RFC9252]
5 SRv6 L3 Service TLV [RFC9252]
6 SRv6 L2 Service TLV [RFC9252]
7-254 Unassigned
255 Reserved [RFC8669]

BGP Prefix-SID Label-Index TLV Flags

Registration Procedure(s)
Expert Review
Expert(s)
Acee Lindem, Hannes Gredler
Reference
[RFC8669]
Available Formats

CSV
Value Name Reference
0x0001-0x8000 Unassigned

BGP Prefix-SID Originator SRGB TLV Flags

Registration Procedure(s)
Expert Review
Expert(s)
Acee Lindem, Hannes Gredler
Reference
[RFC8669]
Available Formats

CSV
Value Name Reference
0x0001-0x8000 Unassigned

BGP Graceful Restart Flags

Registration Procedure(s)
Standards Action
Reference
[RFC4724][RFC8538]
Available Formats

CSV
Bit Position Name Short Name Reference
0 Restart State R [RFC4724]
1 Notification N [RFC8538]
2-3 Unassigned

BGP Graceful Restart Flags for Address Family

Registration Procedure(s)
Standards Action
Reference
[RFC4724][RFC8538]
Available Formats

CSV
Bit Position Name Short Name Reference
0 Forwarding State F [RFC4724]
1-7 Unassigned

SFP Attribute TLVs

Registration Procedure(s)
First Come First Served
Reference
[RFC9015]
Available Formats

CSV
Type Name Reference Registration Date
0 Reserved [RFC9015]
1 Association TLV [RFC9015] 2020-09-02
2 Hop TLV [RFC9015] 2020-09-02
3 SFT TLV [RFC9015] 2020-09-02
4 MPLS Swapping/Stacking [RFC9015] 2020-09-02
5 SFP Traversal With MPLS [RFC9015] 2020-09-02
6-65534 Unassigned
65535 Reserved [RFC9015]

SFP Association Type

Registration Procedure(s)
First Come First Served
Reference
[RFC9015]
Available Formats

CSV
Association Type Name Reference Registration Date
0 Reserved [RFC9015]
1 Bidirectional SFP [RFC9015] 2020-09-02
2-65534 Unassigned
65535 Reserved [RFC9015]

SFC SPI/SI Representation Flags

Registration Procedure(s)
Standards Action
Reference
[RFC9015]
Available Formats

CSV
Value Name Reference
0 NSH data plane [RFC9015]
1 MPLS data plane [RFC9015]
2-15 Unassigned

BFD Mode

Reference
[RFC9026]
Available Formats

CSV
Range Registration Procedures
0-175 IETF Review
176-249 First Come First Served
250-254 Experimental Use
255 IETF Review
Value Description Reference
0 Reserved [RFC9026]
1 P2MP BFD Session [RFC9026]
2-175 Unassigned
176 S-BFD for SRv6 Locator Session [draft-wang-bess-sbfd-discriminator-04]
177 S-BFD for Common Session [draft-wang-bess-sbfd-discriminator-04]
178-249 Unassigned
250-254 Experimental Use [RFC9026]
255 Reserved [RFC9026]

BFD Discriminator Optional TLV Type

Reference
[RFC9026]
Available Formats

CSV
Range Registration Procedures
0-175 IETF Review
176-249 First Come First Served
250-254 Experimental Use
255 IETF Review
Value Description Reference
0 Reserved [RFC9026]
1 Source IP Address [RFC9026]
2-175 Unassigned
176-249 Unassigned
250-254 Experimental Use [RFC9026]
255 Reserved [RFC9026]

SRv6 Service Sub-TLV Types

Reference
[RFC9252]
Available Formats

CSV
Range Registration Procedures
0-127 IETF Review
128-254 First Come First Served
255 IETF Review
Value Type Reference
0 Reserved [RFC9252]
1 SRv6 SID Information Sub-TLV [RFC9252]
2-254 Unassigned
255 Reserved [RFC9252]

SRv6 Service Data Sub-Sub-TLV Types

Reference
[RFC9252]
Available Formats

CSV
Range Registration Procedures
0-127 IETF Review
128-254 First Come First Served
255 IETF Review
Value Type Reference
0 Reserved [RFC9252]
1 SRv6 SID Structure Sub-Sub-TLV [RFC9252]
2-254 Unassigned
255 Reserved [RFC9252]

BGP SRv6 Service SID Flags

Registration Procedure(s)
IETF Review
Reference
[RFC9252]
Available Formats

CSV
Bit Position Name Reference
0-7 Unassigned

Long-Lived Graceful Restart Flags for Address Family

Registration Procedure(s)
Standards Action
Reference
[RFC9494]
Available Formats

CSV
Bit Position Name Short Name Reference
0 Preservation of state F [RFC9494]
1-7 Unassigned

BGP BIER TLV and Sub-TLV Types

Registration Procedure(s)
First Come First Served
Reference
[RFC-ietf-bier-idr-extensions-19]
Available Formats

CSV
Value Name Reference
0 Reserved [RFC-ietf-bier-idr-extensions-19]
1 BIER TLV [RFC-ietf-bier-idr-extensions-19]
2 MPLS Encapsulation sub-TLV [RFC-ietf-bier-idr-extensions-19]
3 non-MPLS Encapsulation sub-TLV [RFC-ietf-bier-idr-extensions-19]
4 BIER Nexthop sub-TLV [RFC-ietf-bier-idr-extensions-19]
5-65535 Unassigned

Contact Information

ID Name Contact URI Last Updated
[Eric_Rosen] Eric Rosen mailto:erosen&cisco.com 2010-02-23
[Gargi_Nalawade] Gargi Nalawade mailto:gargi&cisco.com 2004-02