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(1) (Internet EXchange Processor) See IXA.

(2) (Internet eXchange Point) A public junction point on the Internet that provides an on-ramp to the Internet as well as a location for carriers to exchange traffic. There are approximately 300 IXPs around the world, with more than 100 in the U.S.

An IXP is physically some combination of switches and routers. The organization connects to the IXP from a port on its router to a port on the IXP's switch. The attachment is at the data link level (layer 2) and is typically Ethernet, but can also be ATM.

Public Peering
At these exchange points, major carriers accept traffic from each other and agree to carry the other's packets to their downstream destination point without charge. Peering arrangements are made with bilateral and multilateral agreements between the carriers.

If a carrier with less traffic wants to exchange packets, or a smaller, regional ISP needs an on-ramp to the Internet, a transit agreement is struck, wherein the backbone carrier charges the smaller operator a fee for transmitting its packets.

Private Peering
Major carriers also have private peering agreements between each other in locations where two or more carriers have switching points in close proximity. In late 1995, UUNET, MCI and GTE were the first to begin private arrangements. Thus, the Internet backbones are managed by a combination of public peering at the IXPs, also called "network access points" (see NAP) and private peering at their own locations. See Tier 1 network.
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References in periodicals archive ?
It operates neutral Internet exchange points (IXPs) worldwide and works with trusted parties in local markets to deliver efficient, local interconnection.
A vast majority in the country might not be familiar with the Internet Exchange Point that's sole objective to exchange local internet traffic internally with-in the country between ISPs instead of international exchanges and networks.
After a review of the system, which uncovered a lack of support combined with a lack of automation tools and high levels of power consumption, the IXLeeds team decided to upgrade the Internet Exchange Point.
An internet Exchange Point relays local traffic between users, avoiding the need to go offshore for local contact.
The London Internet Exchange (LINX) is one of the global leaders of Internet Exchange Points. Company ethos and aspirations result in constant growth and improvement in LINX services.
KIXP, the largest internet exchange point in East Africa, enables Kenyan ISPs to exchange traffic within the country without having to use multiple international hops.
Summary: New Brocade MLXe Core Router helps leading Internet Exchange Point cope with close to a Terabit per second (Tbps) of Internet traffic, providing a seamless upgrade path to 100 Gigabit Ethernet (GbE) and future-proofing the network
The idea is to give service providers a more cost-effective way to monitor SLAs over the facilities of other carriers with which they connect at the exchange point. Previously, says CENX founder and President Nan Chen, Carrier Ethernet service providers who wanted that kind of visibility had to buy probes and deploy them at each network endpoint, or "run blind" without any monitoring.
UKE claims that TP refuses to exchange IP traffic at publicly available internet exchange points and forces other providers to interconnect at high prices at the private exchange point that is part of TP's network.
En route to the exchange point, the spaceship crashes, leaving Ramon and his compatriots at the mercy of the miners who populated the planet Axturias.
The London Interact Exchange (LINX), one of the world's largest exchange points, announced today that ISPs and NSPs can explore in advance the business advantages of peering through an Internet exchange point (IXP).