Border Gateway Protocol (BGP) Parameters 2005-08-15 2026-03-19 0x00-0x3f First Come First Served 0x80-0x82 First Come First Served see 0x83-0x8f Reserved for Experimental Use see 0x90-0xbf Standards Action This registry contains values of the high-order octet (the "Type" field) of a Transitive Extended Community. 0x00 Transitive Two-Octet AS-Specific Extended Community (Sub-Types are defined in the "Transitive Two-octet AS-Specific Extended Community Sub-Types" registry) 0x01 Transitive IPv4-Address-Specific Extended Community (Sub-Types are defined in the "Transitive IPv4-Address-Specific Extended Community Sub-Types" registry) 0x02 Transitive Four-Octet AS-Specific Extended Community (Sub-Types are defined in the "Transitive Four-octet AS-Specific Extended Community Sub-Types" registry) 0x03 Transitive Opaque Extended Community (Sub-Types are defined in the "Transitive Opaque Extended Community Sub-Types" registry) 0x04 QoS Marking 0x05 CoS Capability 0x06 EVPN (Sub-Types are defined in the "EVPN Extended Community Sub-Types" registry) 0x07 FlowSpec Transitive Extended Communities 0x08 Flow spec redirect/mirror to IP next-hop 0x09 FlowSpec Redirect to indirection-id Extended Community 0x0a Transport Class 0x0b SFC (Sub-Types are defined in the "SFC Extended Community Sub-Types" registry) 0x0c SRv6 MUP Extended Community 0x0d-0x3f Unassigned 0x80 Generic Transitive Extended Community (Sub-Types are defined in the "Generic Transitive Extended Community Sub-Types" registry) 0x81 Generic Transitive Extended Community Part 2 (Sub-Types are defined in the "Generic Transitive Extended Community Part 2 Sub-Types" registry) 0x82 Generic Transitive Extended Community Part 3 (Sub-Types are defined in the "Generic Transitive Extended Community Part 3 Sub-Types" registry) 0x83-0x8f Reserved for Experimental Use 0x90-0xbf Unassigned 0x40-0x7f First Come First Served 0xc0-0xcf Reserved for Experimental Use see 0xd0-0xff Standards Action This registry contains values of the high-order octet (the "Type" field) of a Non-transitive Extended Community. 0x40 Non-Transitive Two-Octet AS-Specific Extended Community (Sub-Types are defined in the "Non-Transitive Two-octet AS-Specific Extended Community Sub-Types" registry) 0x41 Non-Transitive IPv4-Address-Specific Extended Community (Sub-Types are defined in the "Non-Transitive IPv4-Address-Specific Extended Community Sub-Types" registry) 0x42 Non-Transitive Four-Octet AS-Specific Extended Community (Sub-Types are defined in the "Non-Transitive Four-octet AS-Specific Extended Community Sub-Types" registry) 0x43 Non-Transitive Opaque Extended Community (Sub-Types are defined in the "Non-Transitive Opaque Extended Community Sub-Types" registry) 0x44 QoS Marking 0x45-0x46 Unassigned 0x47 FlowSpec Non-Transitive Extended Communities 0x48-0x49 Unassigned 0x4a Non-Transitive Transport Class 0x4b-0x7f Unassigned 0xc0-0xcf Reserved for Experimental Use 0xd0-0xff Unassigned 0x00-0xbf First Come First Served 0xc0-0xff IETF Review This registry contains values of the second octet (the "Sub-Type" field) of an extended community when the value of the first octet (the "Type" field) is 0x06. 0x00 MAC Mobility 0x01 ESI Label 0x02 ES-Import Route Target 0x03 EVPN Router’s MAC Extended Community 0x04 EVPN Layer 2 Attributes 0x05 E-Tree Extended Community 0x06 DF Election Extended Community 0x07 Reserved Previously used in an early version of draft-sajassi-bess-evpn-virtual-eth-segment-01 0x08 ARP/ND Extended Community 0x09 Multicast Flags Extended Community 0x0A EVI-RT Type 0 0x0B EVI-RT Type 1 0x0C EVI-RT Type 2 0x0D EVI-RT Type 3 0x0E EVPN Attachment Circuit Extended Community 0x0F Service Carving Time 0x10 EVPN Link Bandwidth Extended Community 0x11-0x14 Unassigned 0x15 RT-derived-EC 0x16-0xFF Unassigned 0x00-0xbf First Come First Served 0xc0-0xff IETF Review This registry contains values of the second octet (the "Sub-Type" field) of an extended community when the value of the first octet (the "Type" field) is 0x00. 0x00-0x01 Unassigned 0x02 Route Target 0x03 Route Origin 0x04 Link Bandwidth 0x05 OSPF Domain Identifier 0x06 Route Aggregation Parameter 0x07 Unassigned 0x08 BGP Data Collection 0x09 Source AS 0x0a L2VPN Identifier 0x0b-0x0f Unassigned 0x10 Cisco VPN-Distinguisher 0x11-0x12 Unassigned 0x13 Route-Target Record 0x14 Unassigned 0x15 RT-derived-EC 0x16-0x7f Unassigned 0x80 Virtual-Network Identifier Extended Community 0x81-0xff Unassigned 0x00-0xbf First Come First Served 0xc0-0xff IETF Review This registry contains values of the second octet (the "Sub-Type" field) of an extended community when the value of the first octet (the "Type" field) is 0x40. 0x00-0x03 Unassigned 0x04 Link Bandwidth 0x05-0x7f Unassigned 0x80 Virtual-Network Identifier Extended Community 0x81-0xff Unassigned 0x00-0xbf First Come First Served 0xc0-0xff IETF Review This registry contains values of the second octet (the "Sub-Type" field) of an extended community when the value of the first octet (the "Type" field) is 0x02. 0x00-0x01 Unassigned 0x02 Route Target 0x03 Route Origin 0x04 Generic (deprecated) 0x05 OSPF Domain Identifier 0x06 Route Aggregation Parameter 0x07 Unassigned 0x08 BGP Data Collection 0x09 Source AS 0x0a-0x0f Unassigned 0x10 Cisco VPN Identifier 0x11-0x12 Unassigned 0x13 Route-Target Record 0x14 Unassigned 0x15 RT-derived-EC 0x16-0xff Unassigned 0x00-0xbf First Come First Served 0xc0-0xff IETF Review This registry contains values of the second octet (the "Sub-Type" field) of an extended community when the value of the first octet (the "Type" field) is 0x42. 0x00-0x03 Unassigned 0x04 Generic (deprecated) 0x05-0xff Unassigned 0x00-0xbf First Come First Served 0xc0-0xff IETF Review This registry contains values of the second octet (the "Sub-Type" field) of an extended community when the value of the first octet (the "Type" field) is 0x01. 0x00 Unassigned (deprecated) 0x01 Unassigned 0x02 Route Target 0x03 Route Origin 0x04 IPv4-Address-Specific IFIT Tail Community 0x05 OSPF Domain Identifier 0x06 Unassigned 0x07 OSPF Route ID 0x08 Unassigned 0x09 Node Target Extended Community 0x0a L2VPN Identifier 0x0b VRF Route Import 0x0c Flow-spec Redirect to IPv4 0x0d-0x0f Unassigned 0x10 Cisco VPN-Distinguisher 0x11 Unassigned 0x12 Inter-Area P2MP Segmented Next-Hop 0x13 Route-Target Record 0x14 VRF-Recursive-Next-Hop-Extended-Community 0x15 RT-derived-EC 0x16-0x1f Unassigned 0x20 MVPN SA RP-address Extended Community 0x21-0xff Unassigned 0x00-0xbf First Come First Served 0xc0-0xff IETF Review This registry contains values of the second octet (the "Sub-Type" field) of an extended community when the value of the first octet (the "Type" field) is 0x41. 0x00-0x08 Unassigned 0x09 Node Target Extended Community 0x0a-0xff Unassigned 0x00-0xbf First Come First Served 0xc0-0xff IETF Review This registry contains values of the second octet (the "Sub-Type" field) of an extended community when the value of the first octet (the "Type" field) is 0x03. 0x00 Unassigned (deprecated) 0x01 Cost Community 0x02 Unassigned (deprecated) 0x03 CP-ORF 0x04 Extranet Source Extended Community 0x05 Extranet Separation Extended Community 0x06 OSPF Route Type 0x07 Additional PMSI Tunnel Attribute Flags 0x08 Context-Specific Label Space ID Extended Community 0x09-0x0a Unassigned 0x0b Color Extended Community 0x0c Encapsulation Extended Community 0x0d Default Gateway 0x0e Point-to-Point-to-Multipoint (PPMP) Label 0x0f BGP Group Policy Class Tag Extended Community 0x10 Site Identifier Extended Community 0x11-0x13 Unassigned 0x14 Consistent Hash Sort Order 0x15-0x16 Unassigned 0x17 Group Policy ID Extended Community 0x18-0x1a Unassigned 0x1b Local Color Mapping (LCM) 0x18-0xa9 Unassigned 0xaa LoadBalance 0xab-0xff Unassigned 0x00-0xbf First Come First Served 0xc0-0xff IETF Review This registry contains values of the second octet (the "Sub-Type" field) of an extended community when the value of the first octet (the "Type" field) is 0x43. 0x00 BGP Origin Validation State Extended Community 0x01 Cost Community 0x02 Route Target 0x03-0x14 Unassigned 0x15 RT-derived-EC 0x16-0xff Unassigned 0x00-0xbf First Come First Served 0xc0-0xff IETF Review This registry contains values of the second octet (the "Sub-Type" field) of an extended community when the value of the first octet (the "Type" field) is 0x80. 0x00 OSPF Route Type (deprecated) 0x01 OSPF Router ID (deprecated) 0x02-0x03 Unassigned 0x04 SecurityGroup 0x05 OSPF Domain Identifier (deprecated) 0x06 Flow spec traffic-rate-bytes 0x07 Flow spec traffic-action (Use of the "Value" field is defined in the "Traffic Action Fields" registry) 0x08 Flow spec rt-redirect AS-2octet format 0x09 Flow spec traffic-remarking 0x0a Layer2 Info Extended Community 0x0b E-Tree Info 0x0c Flow spec traffic-rate-packets 0x0d Flow Specification for SFC Classifiers 0x0e-0x83 Unassigned 0x84 Tag 0x85 Origin Sub-Cluster 0x86-0xff Unassigned 0x00-0xbf First Come First Served 0xc0-0xff IETF Review This registry contains values of the second octet (the "Sub-Type" field) of an extended community when the value of the first octet (the "Type" field) is 0x81. 0x00-0x07 Unassigned 0x08 Flow spec rt-redirect IPv4 format 0x09-0xff Unassigned 0x00-0xbf First Come First Served 0xc0-0xff IETF Review This registry contains values of the second octet (the "Sub-Type" field) of an extended community when the value of the first octet (the "Type" field) is 0x82. 0x00-0x03 Unassigned 0x04 SecurityGroupAS4 0x05-0x07 Unassigned 0x08 Flow spec rt-redirect AS-4octet format 0x09-0x83 Unassigned 0x84 Tag4 0x85 Origin Sub-Cluster4 0x86-0xff Unassigned IETF Review Bit 0 is the most significant, or leftmost bit of the six-byte field; bit 47 is the least significant, or rightmost bit. 47 Terminal Action 46 Sample 0-45 Unassigned First Come First Served This registry contains values of the two high-order octets of an IPv6-Address-Specific Extended Community. 0x0000-0x0001 Unassigned 0x0002 Route Target 0x0003 Route Origin 0x0004 OSPFv3 Route Attributes (deprecated) 0x0005 IPv6-Address-Specific IFIT Tail Community 0x0006 Extension of Link Bandwidth Extended Community 0x0007-0x000a Unassigned 0x000b VRF Route Import 0x000c Flow-spec Redirect to IPv6 0x000d Flow spec rt-redirect-ipv6 format 0x000e-0x000f Unassigned 0x0010 Cisco VPN-Distinguisher 0x0011 UUID-based Route Target 0x0012 Inter-Area P2MP Segmented Next-Hop 0x0013 Unassigned 0x0014 VRF-Recursive-Next-Hop-Extended-Community 0x0015 RT-derived-EC 0x0016-0x00ff Unassigned First Come First Served This registry contains values of the two high-order octets of an IPv6-Address-Specific Extended Community. 0x4000-0x40ff Unassigned Standards Action 0-46 Unassigned 47 DCB RFC Required P Advertising PE is the primary PE. B Advertising PE is the backup PE. C Control word MUST be present. M Signaling mode of operation (bits 10-11) V VLAN-ID normalization (bits 8-9) RFC Required 0-6 Unassigned 7 Leaf-Indication IETF Review T Request to send a flow label R Ability to receive a flow label C Presence of a Control Word S Sequenced delivery of frames RFC Required 0 Default DF Election 1 HRW Algorithm 2 Highest-Preference Algorithm 3 Lowest-Preference Algorithm 4-30 Unassigned 31 Reserved for Experimental Use RFC Required 0 D (Don't Preempt) Capability 1 AC-DF Capability 2 Unassigned 3 Time Synchronization 4 BW (Bandwidth Weighted DF Election) 5 Port Mode Designated Forwarder Election 6-15 Unassigned First Come First Served This registry contains values of the second octet (the "Sub-Type" field) of an extended community when the value of the first octet (the "Type" field) is set to 0x0b. 0 Reserved 1 SFIR Pool Identifier 2 MPLS Label Stack Mixed Swapping/Stacking Labels 3-255 Unassigned Standards Action 0-3 Unassigned 4 Immutable ARP/ND Binding Flag (I) 5 Unassigned 6 Override Flag (O) 7 Router Flag (R) First Come First Served 0-2 Unassigned 3 EVPN to EVPN Gateway (EEG) IETF 4 Single Flow Group IETF 5 SEMG (Seamless Interop EVPN Multicast Gateway) IETF 6 EVPN/MVPN Seamless Interop Supported IETF 7 OISM SBD IETF 8 Segmentation Support IETF 9 IPMG IETF 10 MEG IETF 11 PEG IETF 12 OISM-supported IETF 13 Extended-MH-AR IETF 14 MLD Proxy Support IETF 15 IGMP Proxy Support IETF First Come First Served 0 MPLS Label IETF 1-254 Unassigned 255 Reserved IETF Review 0-1 Multihoming Redundancy Mode 2-4 Unassigned 5 ESI-DCB 6-7 Split-Horizon Type IETF Review 00 All-Active 01 Single-Active 10 Unassigned 11 Unassigned IETF Review 00 Default SHT 01 Local Bias 10 ESI Label-based filtering 11 Unassigned 0x00-0xbf First Come First Served 0xc0-0xff IETF Review This registry contains values of the second octet (the "Sub-Type" field) of an extended community when the value of the first octet (the "Type" field) is 0x0a. 0x00-0x01 Unassigned 0x02 Route Target 0x03-0xff Unassigned 0x00-0xbf First Come First Served 0xc0-0xff IETF Review This registry contains values of the second octet (the "Sub-Type" field) of an extended community when the value of the first octet (the "Type" field) is 0x4a. 0x00-0x01 Unassigned 0x02 Route Target 0x03-0xff Unassigned RFC Required 0 Weight in units of Mbps 1 Generalized Weight 2-255 Unassigned Anantharamu Suryanarayana mailto:anantharamu&gmail.com 2018-10-01 Dhananjaya Rao mailto:dhrao&cisco.com 2022-10-26 Enke Chen mailto:enchen&paloaltonetworks.com 2023-07-31 Eric Rosen mailto:erosen&cisco.com 2012-04-10 Nischal Sheth mailto:nischal.sheth&gmail.com 2019-05-17 Manju Ramesh mailto:manjrame&cisco.com 2019-06-19 Renato Fischer mailto:reramalh&cisco.com 2024-08-30 Richard Roberts mailto:rroberts&juniper.net 2019-09-03 Rishabh Parekh mailto:rishabhp&gmail.com 2016-01-19 Thomas Martin Knoll mailto:thomas.m.knoll&gmail.com 2015-01-25 Yakov Rekhter mailto:yakov&juniper.net 2012-07-10