said by eeeaddict:I thought everyone at an exchange peered with each-other and if they REALLY wanted to they could do private peering more easily? I know when I try to hit my address when on a rogers line it's going to NYC THEN DC to before it comes back to torix which to me is beyond stupid
No not everyone peers with everyone. Peers have policies on who they peer with and who they don't. Typically for peering there is "open", "conditional" (sometimes referred to as "selective"), and "restrictive" policies.
Open means they will peer with pretty much anyone. Conditional means they are typically open to peering with most folks but with conditions attached. Restrictive means they will peer only with a select group of peers who meet fairly aggressive conditions.
Rogers AS812 in this example is "conditional" where you must have certain traffic levels and other criteria to peer with them.
An example is our peering policy located at »
netops.nexicom.net/peering - we are fairly open but with a few conditions.