NOTICE: Citizendium is still being set up on its newer server, treat as a beta for now; please see here for more.
Citizendium - a community developing a quality comprehensive compendium of knowledge, online and free. Click here to join and contribute—free
CZ thanks our previous donors. Donate here. Treasurer's Financial Report -- Thanks to our content contributors. --

Internet exchange point

From Citizendium, the Citizens' Compendium
Revision as of 09:52, 17 August 2008 by Howard C. Berkowitz (Talk | contribs) (More on transit)

Jump to: navigation, search
This article is developing and not approved.
Main Article
Related Articles  [?]
Bibliography  [?]
External Links  [?]
Citable Version  [?]
This editable Main Article is under development and not meant to be cited; by editing it you can help to improve it towards a future approved, citable version. These unapproved articles are subject to a disclaimer.

An Internet Exchange Point is a point at which Internet Service Providers, and sometimes end user organizations, can exchange traffic for one anothers' customers. In this context, autonomous systems that exchange reachability information for their own customers are called peers, not to be confused with the use of the word peer to describe a generic BGP session. The most common model of peering at an IXP is multilateral, with all willing AS exchanging customer routes and not charging one another for the service, since it is of mutual benefit.

The exchange is most commonly done through a set of high-speed data link layer switches, with the minimum connection speed being 100 Mbps, 1 Gbps common, and faster links in use. Some IXPs have several sites, and interconnect their switches with links of at least 10 Gbps.

While it is technically possible to use an IXP connection for access to an Internet transit provide, this is generally not allowed. The fundamental purpose of an IXP is revenue-neutral exchange, by providers considering one another as equals, of access to their customers. A customer-provider relationship goes against the economic model of exchange points.

It may be possible, at a given IXP, to run a physical link from the customer AS to the transit provider AS; the IXP may charge a one-time fee or a continuing fee for this sort of "private peering".