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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