IGP
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... term Autonomous System here stresses the fact that, even when
multiple IGPs and metrics are used, the administration of an AS
appears to other ASes ...
... routing terms, an AS will normally use one or more interior
gateway protocols (IGPs) when exchanging reachability information
within its own AS ...
... routing policy). It does not mean a network
multi-homed running an IGP for the purposes of resilience.
An AS ...
... IGP Issues ...
... router vendors require an identifier for
tagging their IGP processes. However, this tag does not need to be
globally unique. In practice this information is never seen by
...
... routing protocols. If already running an exterior routing
protocol, it is perfectly reasonable to use your AS number as an IGP
tag; if you do not, choosing from the private use range ...
... private use range is also
acceptable (see "Reserved AS Numbers"). Merely running an IGP is not
grounds for registration of an AS number ...
...
With the advent of BGP4 it becomes necessary to use an IGP that can
carry classless routes. Examples include OSPF [OSPF ...