Why don't ISPs peer with everyone?
Justin M. Streiner
streiner at cluebyfour.org
Mon Jun 6 14:53:54 CDT 2011
On Mon, 6 Jun 2011, rucasbrown at hushmail.com wrote:
> All the whole "don't peer with this guy" only makes your customers
> have worse latencies and paths to other people, making the Internet
> less healthy.
Not necessarily. Peering with an ISP who wants to take the traffic
between your network and theirs through a saturated pipe, an overloaded
router, or across an MPLS pipe with 13 underlying hops (each of which
could be a choke point themselves) will not make your end-to-end latencies
As others have mentioned, some ISPs do have friendly peering policies.
This is particularly true for ISPs that are co-located at the same IXP,
because much of the opex is already baked into the ISP's relationship with
The reason most of the larger ISPs, particularly those who live in the
DFZ, have peering policies (especially for settlement-free peering) that
could be construed as less friendly to smaller networks is because those
guys want to sell you transit, rather than let you peer for free, or for
less than a the full transit rate. It doesn't make financial sense for
them to exchange bits with you for free, when they can make money off of
those same bits if you buy transit instead.
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