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difference between SAF service-family & address-family

NDP
Beginner
Beginner

 I cant seem to find a simple definition of the difference between SAF service-family & address-family.
Could someone please explain these two terms.

1 Reply 1

Giuseppe Larosa
Hall of Fame Master Hall of Fame Master
Hall of Fame Master

Hello @NDP ,

in multiprotocol BGP an address family specifies a type of NLRI

Example : Ipv4

A sub address family SAFI specifies some more specific attributes

Example:

IPv4 unicast

IPv4 multicast

IPv4 unicast and multicast

AN NLRI with AFI IPv4 subAFI unicast specifies a prefix for Unicast routing only.

An NLRI with AFI IPv4 subAFI multicast specifies a prefix for the only purpose of passing a multicast RPF check in inter AS multicast

An NLRI with AFI IPv4 subAFI unicast and multicast does both of the above

 

Other important examples are the various flavors of VPLS:

VPLS LDP based with MP BGP discovery uses an AFI and a specific sub AFI

VPLS BGP based with MP BGP discovery uses the same AFI but a different sub AFI .

to be noted the prefix lengths of these two are different 96 bits and 137 bits respectively

 

Hope to help

Giuseppe

 

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