BGP Address Family
Introduction
There is a number of BGP address-families. Each one is identified by the Address-Family Identifier (AFI). Within each AFI there is a Subsequent Address Family Identifier.
AFI
- Common AFI
- From RFC2858 definition "This field carries the identity of the Network Layer protocol associated with the Network Address that follows. "
Value | Description | Notes |
---|---|---|
1 | IPv4 | |
2 | IPv6 | |
16388 | BGP-LS | BGP Link State use for traffic engineering |
SAFI
- Common SAFI:
- From RFC2858 definition "This field provides additional information about the type of the Network Layer Reachability Information carried in the attribute."
Value | Description | Notes |
---|---|---|
1 | Network Layer Reachability Information used for unicast forwarding | |
2 | Network Layer Reachability Information used for multicast forwarding | |
4 | Network Layer Reachability Information with Labels, using BGP to distribute labels (BGP-LU) | |
65 | VPLS | |
70 | BGP EVPN | |
71 | BGP LS | |
128 | MPLS-labeled VPN address | |
132 | Route Target Constraint |
Examples
- 1/128 is VPNv4 Unicast MPLS
- 2/1 is IPv6 unicast
- ** 16388/71** is BGP Link State
- 1/4 is BGP Label Unicast (BGP-LU)