Topology & Extensions
The SIX topology is that of a Cisco Catalyst 6509 and Cisco Nexus 5020 which constitute the "core", along with a number of extension switches (extensions) connected to the core.
The core switches are managed by the SIX ops team while the extensions are managed by their respective operators, sometimes with assistance from the SIX ops team.
It is recommended that you connect directly to the core, if able. Instructions for doing so are here.
Extensions may charge participants to connect. Contact them for details.:
| Extension | Location | Uplink Speed | Switch Make/Model | Multicast Available | Contact |
| Cipherkey | Vancouver, Canada | 1 Gbps | Cisco 6500's | No | info _a_t_ cipherkey.net |
| ColoCenters | Westin Building 18th floor | 1 Gbps | Cisco 3524 | No | info _a_t_ colocenters.com |
| FiberCloud 18 | Westin Building 18th floor | 1 Gbps | Cisco 3560 | No | sales _a_t_ fibercloud.com |
| FiberCloud 19 | Westin Building 19th floor | 1 Gbps | Cisco 3524-XL | No | sales _a_t_ fibercloud.com |
| IX-NWWA | Tulalip, WA | 1 Gbps | Cisco 4912G | No | noc _a_t_ ix-nwwa.org |
| Layer42 | National MPLS backbone | 1 Gbps | Cisco 6500's | Yes | (408) 450-5740 |
| NSIX | Fisher Plaza | 1 Gbps | Cisco 4912G | Yes | mksmith _a_t_ adhost.com |
| Swift | Westin Building 20th floor | 3 Gbps | Cisco 3560 | No | henry _a_t_ swiftco.net |
| Switch & Data PAIX | Seattle | 10 Gbps | Force10 E1200 | No | (813) 207-7700 |