routing information
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... routing decisions are made in
the Internet today. It is the exchange of routing information
between ASes that is subject ...
... whether NET1 belongs to ASX or to some other AS which exchanges
routing information with ASX, either directly or indirectly; we just
assume that ASX knows how to direct packets towards NET1. Likewise
ASY knows how to reach NET2.
...
... For traffic to flow, ASY has to accept this routing information and
use it. It is ASY's privilege to either use or disregard the
...
... or Autonomous System Number) associated with it; this number is used
in both the exchange of exterior routing information (between
neighboring ASes), and as an identifier ...
... routing processes. This tag
does not need to be unique unless routing information is indeed
exchanged with other ASes. See "IGP ...
...
* Exchange of external routing information
An AS ...
...
An AS must be used for exchanging external routing information
with other ASes through an exterior routing protocol ...
... routing protocol is BGP, the Border
Gateway Protocol. However, the exchange of external routing
information alone does not constitute the need for an AS. See
"Sample Cases" below.
...