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Thread Index [isp-bgp] Re: Multiple Peerings on the same link
On Wed, 8 Sep 2004, Tulip Rasputin wrote:
> Any reason why somebody would want to have multiple BGP peerings/sessions
> with the *same* router over the same link? I can understand, if its multiple
> links (load balancing and redundancy), but why over the same link?
Yeah, that's a common enough setup. I often see physical interconnects
between ISPs which have three logical links on them (VLANs or PVCs), one
on which ISP A sells transit to ISP B, one on which ISP B sells transit to
ISP A, and one on which they peer with each other. Common in places where
there's a local IX but really expensive external transit, since it lets
each ISP use the other's upstream as a backup.
-Bill
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