London Internet Exchange

London Internet Exchange
Name	London Internet Exchange
Abbreviation	LINX
Formation	1994
Type	Association
Purpose	Internet exchange point
Headquarters	London
Region served	United Kingdom, Europe
Membership	Internet service providers, content providers, carriers

London Internet Exchange The London Internet Exchange is one of the largest Internet exchange points in the world, serving as a neutral peering fabric connecting networks such as BT Group, Virgin Media, Google, Amazon (company), and Facebook-related infrastructure. It interconnects carriers, content delivery networks, cloud providers, and academic networks including JANET (UK), Akamai Technologies, and Cloudflare across multiple metropolitan sites. The exchange operates within the ecosystem of organizations like RIPE NCC, IETF, Internet Society, and interacts with regional exchanges such as DE-CIX, Amsterdam Internet Exchange, and IX.br.

Overview

The exchange provides public and private peering, route servers, and multicast services that facilitate traffic exchange among members like Microsoft, Netflix, AOL, and Sky UK. It supports Ethernet-based fabrics, allowing participants from operators including Telefónica, Vodafone, KPN, and Tata Communications to reduce transit costs and improve latency. The entity functions alongside major data centre operators such as Equinix, Digital Realty, Interxion, and Telehouse to deliver interconnection services across London metropolitan campuses.

History and Development

Founded in the mid-1990s amid rapid growth of providers including BT Group and Cable & Wireless, the exchange expanded through partnerships with organisations like RIPE NCC and initiatives influenced by standards from IETF working groups. Over time it adapted to traffic patterns driven by platforms such as YouTube, Facebook, and Netflix, and was shaped by industry events involving Amazon (company)'s cloud rollout and the rise of content delivery networks like Akamai Technologies. Strategic developments mirrored trends seen at peers including DE-CIX and AMS-IX and incorporated practices from the carrier-neutral data centre movement promoted by Equinix and Digital Realty.

Infrastructure and Locations

The fabric spans multiple data centres and carrier hotels, interconnecting sites such as Telehouse North, Telehouse East, Telehouse West, Equinix LD8, Interxion LON01, and facilities run by Digital Realty. Hardware deployments have used switches from vendors like Juniper Networks, Arista Networks, and Cisco Systems and optical links supplied by Corning Incorporated and Ciena Corporation. The exchange leverages metropolitan dark fibre rings, wavelength services from carriers including BT Group and Tata Communications, and point-to-point lambda circuits used by cloud providers such as Google and Microsoft.

Membership and Services

Membership includes ISPs, content providers, enterprise networks, and research networks from organisations such as Virgin Media, TalkTalk, Sky UK, BBC, Oxford University, and Imperial College London. Services comprise public peering, private VLANs, Virtual Private LAN Service (VPLS) equivalents, route servers, remote peering options, and traffic statistics utilized by members like Netflix and Cloudflare to optimise routing. Commercial arrangements are comparable to those at exchanges such as DE-CIX, AMS-IX, and LINX's peers in the USA like Equinix Ashburn participants.

Governance and Operations

The organisation is governed by a membership-elected board with operational practices influenced by stakeholders including ISPA UK and standards from IETF and RIPE NCC. Day-to-day operations are staffed by engineering teams coordinating with data centre operators like Telehouse and network vendors such as Arista Networks and Juniper Networks. Policies on peering, port allocation, and membership adhere to procedures common to exchanges linked to bodies like European Commission digital infrastructure initiatives and collaborations with academic consortia such as JANET (UK).

Traffic and Performance

Traffic volumes have fluctuated with the rise of streaming platforms like Netflix and video services such as YouTube, and by the adoption of cloud services from Amazon Web Services, Microsoft Azure, and Google Cloud Platform. Performance metrics emphasise low latency and high throughput for transit between networks including BT Group, Virgin Media, Telefónica, and continental peers served via links to exchanges like AMS-IX and DE-CIX. Monitoring and measurement tools used by the exchange and members include practices discussed in IETF documents and measurement projects supported by organisations like RIPE NCC.

Security and Resilience

Operational resilience is achieved through diverse metro connectivity via vendors like Ciena Corporation and Corning Incorporated, redundant routing, and coordination with incident response teams including CERT-UK and international counterparts such as US-CERT and CERT-EU. Mitigation practices for distributed denial-of-service events draw on experience from content networks like Cloudflare and Akamai Technologies and employ filtering, blackholing, and coordination with upstreams including Telefonica and Tata Communications. The exchange participates in industry forums including IETF and Internet Society to share best practices on routing security and resilience.

Category:Internet exchange points