Same AS number from different location and Migration of IP addresses

Marshall Eubanks tme at
Sat May 24 08:15:01 CDT 2008

On May 23, 2008, at 8:15 PM, devang patel wrote:

> Hello,
> Is that okay to use Same AS number for the two different site on  
> different
> location?

To answer this specific question, Autonomous Systems should be  
topologically convex.
This means, at the Internet interdomain routing (BGP) level, that  
cannot leave an AS in one place to get to locations in the same AS in  
some other place.

So, to put two sites on one AS, there should be an internal connection  
between them, which can be done
through your internal network, by a direct connection, or by a tunnel.  
Traffic might come to
the AS at either site, and has to be routed internally to get to the  

See RFC 1930 and the material linked to in the other posts.


> as well as any good documentation or link or deployment scenario  
> where I can
> find the merging of two different AS into one AS?
> As well as what to do if I have an IP addresses as a service provider
> dependent block and want to migrate IP addressing to the IANA  
> assigned ip
> addresses?
> how can i achieve that?
> regards
> Devang Patel

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