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Border Gateway Protocol (BGP) Parameters
Border Gateway Protocol (BGP) Parameters
Last Updated
2025-10-08
Available Formats
XML
HTML
Plain text
Registries Included Below
BGP Message Types
Registration Procedure(s)
Standards Action
Reference
[RFC4271 ]
Available Formats
CSV
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-02 ]
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 2025-06-06, expires 2026-07-08)
[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
[RFC9793 ]
42
Edge Metadata Path Attribute (TEMPORARY - registered 2025-04-23, expires 2026-04-23)
[draft-ietf-idr-5g-edge-service-metadata-27 ]
43-127
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
Loss of LSDB Synchronization
[RFC9815 ]
10-255
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
OPEN Message Error subcodes
Registration Procedure(s)
Standards Action
Reference
[RFC4271 ]
Available Formats
CSV
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
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
BGP OPEN Optional Parameter Types
Registration Procedure(s)
IETF Review
Reference
[RFC5492 ]
Available Formats
CSV
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
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, publication requested 2025-07-07)
[draft-ietf-bess-mvpn-evpn-sr-p2mp-15 ]
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
BGP Prefix-SID TLV Types
Registration Procedure(s)
Expert Review
Expert(s)
Acee Lindem, Hannes Gredler
Reference
[RFC8669 ]
Available Formats
CSV
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
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
[RFC9793 ]
Available Formats
CSV
BGP CAR NLRI Types
Registration Procedure(s)
Specification Required
Expert(s)
Unassigned
Reference
[RFC-ietf-idr-bgp-car-16 ]
Available Formats
CSV
BGP CAR NLRI TLV Types
Registration Procedure(s)
Specification Required
Expert(s)
Unassigned
Reference
[RFC-ietf-idr-bgp-car-16 ]
Available Formats
CSV
Contact Information