GOSIP Version 2 NSAP structure <----IDP---> +-----+-----+----------------------------------------+ | AFI | IDI |<----------------------DSP------------->| +-----+-----+----------------------------------------+ | 47 | 0005| DFI | AA | Rsvd | RD | Area | ID | SEL | +-----+-----+----------------------------------------+ octets | 1 | 2 | 1 | 3 | 2 | 2 | 2 | 6 | 1 | +-----+-----+----------------------------------------+ IDP Initial Domain Part AFI Authority and Format Identifier IDI Initial Domain Identifier DSP Domain Specific Part DFI DSP Format Identifier AA Administrative Authority Rsvd Reserved RD Routing Domain Identifier Area Area Identifier ID System Identifier SEL NSAP Selector from:RFC1629 .