Seattle Internet Exchange

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Seattle Internet Exchange
Full nameSeattle Internet Exchange
Founded1997, June
LocationSeattle, Washington, US
Peak1103 Gbit/s[2]
Daily (avg.)705 Gbit/s[2]
Westin Building, the primary home of the Seattle Internet Exchange

The Seattle Internet Exchange (SIX) is an Internet exchange point in Seattle, USA. It has two locations in the city: the Westin Building and KOMO Plaza (formerly Fisher Plaza). The SIX is a fast-growing,[citation needed] neutral and independent peering point which was created as a free exchange point sponsored only by donations. It continues to run without any recurring charges to the participants and current major funding comes from one-time 10 and 100 Gbit/s port fees. The SIX is a 501(c)(6) tax-exempt non-profit corporation.

As of December 19, 2018 there are 329 routers at the Seattle Internet Exchange (SIX) advertising at least 92,000 unique Border Gateway Protocol (BGP) routes. There are two route servers running Bird Internet routing daemon (BIRD).


The core of the Seattle Internet Exchange (SIX) is an Arista Networks 7508E and a 7512R at the Westin Building, an Extreme Networks X670 at KOMO Plaza (formerly Fisher Plaza), and a Cisco Nexus 3524P at Sabey IGX.[3] Participants may connect to the SIX core using a 1 Gbit/s, 10 Gbit/s or 100 Gbit/s Ethernet connection (fiber) or to one of several extensions. Many of the extensions are sponsored by the colocation facilities in the building, and many of these extensions support 100BASE-TX or greater connections.

Both IPv4 and IPv6 peering is available and encouraged at the SIX, with availability dependent on the peer. Jumbo frame peering at 9000-byte maximum transmission unit (MTU) is available.


The following is a list of the extensions connected to the SIX:[3]

See also[edit]


  1. ^
  2. ^ a b
  3. ^ a b "SIX Topology & Extensions". Seattle Internet Exchange. Retrieved 2017-07-10.

External links[edit]