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Autonomous system(AS) = Administrative Area?

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Sep 9th, 2006
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"IGRP uses an autonomous system (AS) number as part of the configuration" Is AS number in IGRP has the same meaning as IANA assigned AS? Or it is just an administrative Area like area in OSPF? Are they (OSPF area and IGRP AS) for the same purpose?

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globalnettech Sun, 09/10/2006 - 12:05
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Hello,


the AS numbers you refer to assigned by IANA are used for BGP routing. Basically, IANA has two ranges of AS numbers: the first are called public AS numbers, which may be used on the internet and range from 1 to 64511. The second range, from 64512 to 65535, are known as private numbers, and can only be used internally within an organization.

The private range can be compared with the

AS or process numbers used by IGRP and OSPF. IGRP and OSPF use these numbers to enable routers to identify themselves to other routers in the same administrative area. Routing information used in OSPF, IGRP, and BGP private range ASs is not routed over the Internet, only that from public BGP ASs...

Does that answer your question ?


Regards,


GNT

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