To set up peers in BGP, one of the two will use the IP address from the
other AS becaue the link must be on the same subnet, and that subnet's IP
address block must belong to one of the two. That's probably what you saw
when you did the traceroute. You should see a different IP address block if
you traceroute "thru" the peering session.
HTH,
Rog
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Dan West
> Sent: Wednesday, June 14, 2000 8:07 AM
> To: [EMAIL PROTECTED]
> Subject: BGP question
>
>
> My former employer (an ISP) had BGP peering with our
> upstream provider(Telco). As I understand it so far,
> BGP4 is used to advertise routes between autonomous
> systems. One day I ran a web-based traceroute to my
> old haunt and it showed them having the same
> autonomous system number as our bandwidth provider.
> Were we unnecessarily using BGP? I don't understand
> why our telco and we (the ISP) had the same AS number.
>
>
> Am I misunderstanding the purpose of the AS number in
> BGP?
>
> Many thanks.
>
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