> More importantly it's probably to 2 redundant routers on SIX side also so that both can handle HW failure.
Strictly speaking, IXPs do not work at OSI Layer 3, but usually at Layer 2.
All the Layer 3 routing logic happens in the routers of the members/customers of the IXP. The IXP is just there to provide a neutral interconnect to everyone without any filtering or policy.
The IXP runs router reflectors where people can choose to advertise themselves, and then other folks see who is in the neighbourhood and make their own routing policy choices.
The folks at Network Startup Resource Center (NSRC) have a series of videos on "IXP Design and Implementation":
Strictly speaking, IXPs do not work at OSI Layer 3, but usually at Layer 2.
All the Layer 3 routing logic happens in the routers of the members/customers of the IXP. The IXP is just there to provide a neutral interconnect to everyone without any filtering or policy.
The IXP runs router reflectors where people can choose to advertise themselves, and then other folks see who is in the neighbourhood and make their own routing policy choices.
The folks at Network Startup Resource Center (NSRC) have a series of videos on "IXP Design and Implementation":
* https://learn.nsrc.org/bgp
They're by Philip Smith, who helped set up LINX (London, UK) in the early days:
* https://nsrc.org/bios/PhilipSmith.html