On 10/16/21 06:48, Masataka Ohta wrote:
Jay Hennigan wrote:
Access/retail ISPs should want to peer with CDNs as it greatly reduces their transport costs.
Not at all.
Access/retail ISPs have no problem by peering with neutral backbone providers.
Neutral backbone providers don't peer with access/retail ISPs. They sell transit to them.
CDN provided backbone only reduces costs of other backbone providers without reducing costs of access/retail ISPs.
Access/retail ISPs that peer with CDNs eliminate the cost of paying for transit for the content delivered by the CDN. That's what the initials CDN stand for. Access/retail ISPs that peer with CDNs don't reduce the costs of backbone providers, they reduce their profits. Those backbone providers no longer are charging to deliver the content provided by the CDNs. The retail/access ISPs are getting it direct at no charge from the CDN by peering. It also reduces the cost to the content provider as they no longer are paying a transit provider to deliver it. It also often increases the reliability of the Internet experience by creating a more direct path.
Worse, peering beyond neutral providers costs more for access/retail providers.
I think you are mistaken. Every gigabyte delivered by peering is a gigabyte that the access/retail ISP isn't paying a transit provider to deliver. -- Jay Hennigan - jay@west.net Network Engineering - CCIE #7880 503 897-8550 - WB6RDV