BGP AFI/SAFI

BGP Finite-State Machine Operation

http://www.informit.com/library/content.aspx?b=CCIE_Practical_Studies_II&seqNum=79

BGP AFI/SAFI

Address Family Identifiers (AFI)

http://www.iana.org/assignments/address-family-numbers/address-family-numbers.xhtml

Subsequent Address Family Identifier (SAFI)

http://www.iana.org/assignments/safi-namespace 

http://routing-bits.com/2009/11/26/output-101-bgp-afisafi/ 

http://www.cisco.com/en/US/docs/ios/12_0s/feature/guide/sbgprmib.html