network
Click on the red underlined text to get to the source
...
This memo is aimed at network operators and service providers who
need to understand under what circumstances they should make use of
...
... an AS. It is expected that the reader is familiar with routing
protocols and will be someone who configures and operates Internet
networks. Unfortunately, there is a great deal of confusion in how
ASes should be used today; this memo attempts to clear up some of
...
... Internet (see [CIDR]), a block of class A, B, or C networks
may be referred to by merely a prefix and a mask, so long as such a
...
... may be referred to by merely a prefix and a mask, so long as such a
block of networks begins and ends on a power-of-two boundary. For
example, the networks:
...
... and in simple terms may be thought of as a group of one or more
networks. We use the term "network" to mean classful network, or "A,
...
... group of one or more
networks. We use the term "network" to mean classful network, or "A,
B, C network ...
... ASes to have a single coherent interior routing
plan and presents a consistent picture of what networks are
reachable through it.
...
... IP prefixes run by one
or more network operators which has a SINGLE and CLEARLY DEFINED
routing policy.
...
... AS is to be avoided, as is the worst-case scenario of
one AS per classful network (the IDEAL situation is to have one
prefix, containing many longer prefixes ...
... one AS with its own routing policy). It does not mean a network
multi-homed running an IGP for the purposes of resilience.
...
... service
providers.
This is ALMOST THE ONLY case where a network operator should
create its own AS number ...
... Routing policy decisions such as geography, AUP (Acceptable Use
Policy) compliance and network topology can influence decisions
of AS creation. However, all too often these are done without
...
... prefix into two ASes for policy reasons. Those making
external policy may request the network operators make such AS
changes, but the final decision is up to those network operators ...
... network operators make such AS
changes, but the final decision is up to those network operators
who manage the prefixes in question, as well as the ASes ...