
Subsequent Address Family Identifiers (SAFI) - per [RFC4760]

(last updated 2008-02-05)

As specified in this document, the MPL_REACH_NLRI and MP_UNREACH_NLRI
attributes contain the Subsequent Address Family Identifier (SAFI)
field. The IANA will maintain and register values for the SAFI namespace 
as follows.  

Registration Procedures: 
4 - 63:    Standards Action or Early Allocation policy
64 - 127:  First Come First Served
128 - 240: Some recognized assignments below, others Reserved
241 - 254: Private Use (not to be assigned)

Value    Description                                     Reference
-----    -----------                                     ---------
0        Reserved                                        [RFC4760]

1        Network Layer Reachability Information used     [RFC4760]
         for unicast forwarding	

2        Network Layer Reachability Information used     [RFC4760] 
         for multicast forwarding
	
3        Reserved                                        [RFC4760]

4        Network Layer Reachability Information (NLRI)   [RFC3107]
         with MPLS Labels

5        MCAST-VPN                                       [draft-ietf-l3vpn-2547bis-mcast-bgp]
         (TEMPORARY - Expires 2008-06-19)

6        Network Layer Reachability Information used     [draft-ietf-pwe3-dynamic-ms-pw]
         for Dynamic Placement of Multi-Segment
         Pseudowires
         (TEMPORARY - Expires 2008-08-23)

7-63     Unassigned (Standards Action or Early Allocation)

64       Tunnel SAFI                                     [Nalawade]

65       Virtual Private LAN Service (VPLS)              [draft-ietf-l2vpn-vpls-bgp]

66       BGP MDT SAFI                                    [Nalawade]

67       BGP 4over6 SAFI                                 [Cui]

68       BGP 6over4 SAFI                                 [Cui]

69       Layer-1 VPN auto-discovery information          [draft-ietf-l1vpn-bgp-auto-discovery]

70-127   Unassigned (FCFS)

128      MPLS-labeled VPN address                        [RFC4364]

129      Multicast for BGP/MPLS IP Virtual Private       [RFC2547]
         Networks (VPNs)

130-131  Reserved                                        [RFC4760]

132      Route Target constrains                         [RFC4684]

133      Dissemination of flow specification rules       [draft-marques-idr-flow-spec]

134      Dissemination of flow specification rules       [draft-marques-idr-flow-spec]

135-139  Reserved                                        [RFC4760]

140      VPN auto-discovery                              [draft-ietf-l3vpn-bgpvpn-auto]

141-240  Reserved                                        [RFC4760]

241-254  Private Use                                     [RFC4760]

255      Reserved                                        [RFC4760]


References
----------
[RFC2547]  E. Rosen and Y. Rekhter, "BGP/MPLS VPNs", RFC 2547, March 1999.

[RFC3107]  Y. Rekhter and E. Rosen, "Carrying Label Information in 
           BGP-4", RFC 3107, May 2001.

[RFC4364]  E. Rosen and Y. Rekhter, "BGP/MPLS IP VPNs", RFC 4364, February 2006.

[RFC4684]  P. Marques, R. Bonica, L. Fang, L. Martini, R. Raszuk, K. Patel
           and J. Guichard, "Constrained VPN Route Distribution", RFC 4684,
           November 2006.

[RFC4760]  T. Bates, R. Chandra, D. Katz and Y. Rekhter, "Multiprotocol 
           Extensions for BGP-4", RFC 4760, January 2007.

[RFC-ietf-l2vpn-vpls-bgp-08.txt] 
           K. Kompella and Y. Rekhter, "Virtual Private LAN Service 
           (VPLS) Using BGP for Auto-discovery and Signaling", RFC XXXX,
           Month Year.

[draft-ietf-l3vpn-bgpvpn-auto]  Work-in-Progress

[draft-ietf-pwe3-dynamic-ms-pw] Work-in-Progress

[draft-marques-idr-flow-spec]   Work-in-Progress

[draft-ietf-l3vpn-2547bis-mcast-bgp] Work-in-Progress

[draft-ietf-l1vpn-bgp-auto-discovery] Work-in-Progress

People
------
[Bates] Tony Bates, <tbates&cisco.com>, July 2000. 

[Cui]  Yong Cui, <cuiyong&tsinghua.edu.cn>, 15 August 2006, 20 September 2006.

[Nalawade]  Gargi Nalawade, <gargi&cisco.com>, January 2004. 
           (draft-nalawade-kapoor-tunnel-safi-01.txt)  
           (draft-nalawade-idr-mdt-safi-00.txt), February 2004.

(created July 2000)

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