TREX runs two route servers to facilitate the interconnection of members. The route servers accept all RIPE registered routes from all members that wish to peer with the route servers and announce those routes to all members that wish to receive them.
Both route servers are running BIRD right now. However, we have plans to change one of them to run some other software to protect the service from bugs occuring in either one of the chosen software routing daemons. Further details are as yet unavailable.
The AS number that the servers use is 197032 which is a 32-bit ASN. Members that wish to peer with it, but who cannot configure 32-bit ASNs in their routers should configure 23456 instead. All ASNs visible via the route-servers have been collected into the AS macro AS197032:AS-ALL. The addresses of the servers are 184.108.40.206, 220.127.116.11, 2001:7f8:1d:4::1 and 2001:7f8:1d:4::2.
The route servers require BGP TTL Security aka GTSM. This feature aims to prevent anyone outside the exchange point from disrupting BGP sessions over the exchange. What it means is that all BGP packets are sent with TTL 255, and BGP packets with TTL values less than 255 are filtered. This makes them impossible to fake more than 1 router hop away.
EBGP Multi-Hop 255 is almost, but not quite, the same as sending BGP TTL Secure packets: it works for IPv4, but for IPv6 it drops link local next-hops from the route advertisements, making the routes invalid.
Members who have transit-customer relationships with other members on the exchange should be careful about using the route servers in case they might inadvertently damage the functionality of said transit. The communities listed below can be used to limit route visibility in such cases.
BGP Communities Supported
|197032:0:ASN||not to ASN|
|197032:0:65534||not to anyone|
|197032:65534:ASN||yes to ASN|
0:1234 0:2345The Large Community equivalents are:
To change from opt-out style announcement of routes to opt-in style announcement, use the community 0:65534. Routes with that community will not be announced to any peer unless the community 65534:peer-as appears on the route. For example, to announce a route to only autonomous systems 29243 and 51164 use the following set of communities:
0:65534 65534:29243 65534:51164The Large Community equivalents are:
197032:0:65534 197032:65534:29243 197032:65534:51164
Only the Large Communities will work with 32bit autonomous system numbers.