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Default-free zone
In the context of Internet routing, the default-free zone (DFZ) refers to the collection of all Internet autonomous systems (AS) that do not require a default route to route a packet to any destination. Conceptually, DFZ routers have a "complete" BGP table, sometimes referred to as the Internet routing table, global routing table or global BGP table, but, realistically, the widespread use of route filtering and the rapid rate of change in Internet routing ensure that no router anywhere has an absolutely complete view of all routes, and any such routing table would, in any case, look different from the perspective of different routers, even if a stable view could be achieved.
== Highly Connected Autonomous Systems and Routers ==
The Weekly Routing Reports〔(【引用サイトリンク】 title=BGP Routing Table Analysis )〕 used by the ISP community come from the Asia-Pacific Network Information Centre (APNIC) router in Tokyo, which is a well-connected router that has as good a view of the Internet as any other single router. For serious routing research, however, routing information will be captured at multiple well-connected sites, including high-traffic ISPs (see the "skitter core") below.
As of May 12, 2014, there were 494,105 routes seen by the APNIC router. These came from 46,795 autonomous systems, of which only 172 were transit-only and 35787 were stub/origin-only. 6087 autonomous systems provided some level of transit.〔(【引用サイトリンク】 title=Routing Table Report 04:00 +10GMT Mon 12 May, 2014 )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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