Peering point speed publicly available?

Fri Jul 2 00:14:10 UTC 2004

    > I have a question regarding information on my ISP's peering relationships.
    > Are the speeds of some or all peering relationships public knowledge, and if
    > so, where can I find this?  By speed, I mean bandwidth (DS3, OC3, 100Mbps,
    > 1Gbps, etc.).  I am trying to transfer large stuff from my AS, through my
    > ISP, through another ISP, to another AS, and I'm wondering how fast the
    > peering point is between the ISPs.

ISPs don't register it or publish it anywhere, generally, and if you ask
salescritters, they're likely to say "At the speed of LIGHT!!!" or some
such.  But the two methods people would generally use to determine this
externally would be first to do a bidirectional traceroute and look
closely at the in-addr DNS names associated with the router interfaces on
the IX or crossconnect, which, if you trust them, may give you some
indication of speed.  Next, if you have time, you could run pathchar
across the link.

                                -Bill