DE-CIX operates so-called route server systems (s. RFC7947 for a detailed description) to facilitate the exchange of BGP announcements between peers at DE-CIX. Each peer needs only to set up a BGP connection to the route server in order to receive the BGP announcements of all other peers having a BGP connection with the route server.
DE-CIX operates two route servers at each of its Internet Exchanges that are redundant to each other.
Route servers keep the number of necessary BGP sessions low for DE-CIX customers because you need only one BGP session to each of the route servers to receive the prefixes of all other route server users.
You can use BGP communities to tell the DE-CIX route servers to whom to announce (or not announce) your prefixes.
Incoming, you can use filter lists on your routers to decide what to accept (or not accept) from the prefixes the route servers announce to you.
For newly connected networks, the route servers give a kickstart into peering as they receive all prefixes of all route server users without setting up individual BGP peering sessions; one session to each of the two route servers is enough.
Route Server Guides for the exchanges
At the links below, you can find the detailed route server guides for our locations:
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BGP Communities and additional information
On the DE-CIX website, you can also find more information about:
DE-CIX white papers
More information can also be found in the DE-CIX white papers, e.g. the Traffic routing basics white paper.