Occasionally, peering requirements include a “Not to Exceed” traffic ratio which specifies that aggregate peering traffic ratios will not exceed a particular ratio. This ratio is quoted in the "Out:In" form, as in, "traffic ratios must not to exceed 2:1.”
The more interesting question is, "Are Peering Ratios a rational discriminator or is it just a rationale for saying 'No'?"
We did research with the peering coordinators and determined that there are a handful of arguments that are given for not peering with those that don't have a balanced ratio. These peering ratio arguments are refuted in "The Folly of Peering Ratios." In a nutshell, peering traffic ratios are a mechanism for ISPs to deny peering with others that do not look like them. Ultimately, ISPs with peering ratio requirements do so as a way to tease away potential customers out of the mix of potential peers.
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The 2014 Internet Peering Playbook is now available on the iPad at the Apple Store and for the Amazon Kindle. The Kindle, ePub and PDF form are also perpetually updated on the DrPeering DropBox share.
