I think that's where BGP fits in.

IGRP, RIP, EIGRP, OSPF and IS-IS are all Interior Gateway
Protocols(IGPs), and BGP is a Exterior Gateway Protocol(EGPs)
So in BGP Autonomous Numbers are actually used.

for example;  router bgp 3 <--- 3 means autonomous number

one cent after reading Halabi's book, 



On 7 Nov 2000 11:47:41 -0500, [EMAIL PROTECTED] ("Shaw,
Winston Mr.") wrote:

>The concept of an Autonomous System is carried in the AREA(S) used by OSPF.
>There are  4 things which enable OSPF routers to become adjacent in the same
>area.
>
>Area Identification
>Authentication
>Hello and Dead Intervals
>Stub Area Flag
>
>However, the AS may consist of several areas arranged in a hierachy with
>Area 0 at the top. 
>
>The AS can  seen as a group of one or more areas under the same
>administration.
>
>The router process-id only identifies a particular separate algorithm of
>OSPF. There can be more than one OSPF process running on the same routers in
>the same area.
>
>Hope it helps.
>Winston.
>
>> -----Original Message-----
>> From:        Jeff McCoy [SMTP:[EMAIL PROTECTED]]
>> Sent:        Tuesday, November 07, 2000 3:26 PM
>> To:  [EMAIL PROTECTED]
>> Subject:     ospf process id / AS??
>> 
>> If the process id is defined as 200 in the command:
>> 
>> router ospf 200
>> 
>> and this is not the AS, then where is the AS defined?
>> 
>> -jm
>> 
>> 
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