White Papers

Traffic routing basics (BGP focus)

Traffic routing basics (BGP focus)

Traffic routing basics (BGP focus)

Download our white paper to learn more about inbound and outbound routing, how a router decides which path is best, localpref, MED and AS-PATH rules, and best practices.

Here is a preview:

Basic information:

  • You define where packets leave your network
  • The other party defines which route is used to route the packets back to you
  • In most cases, the Internet is not routed symmetrically

Routing outbound

Routing packets from your network to the other network are defined by you.

  • Your router sends outgoing packets on the basis of its routing table
  • The routing table is built up based on learned (=incoming) prefixes from neighbors
  • Prefixes are typically learned from:
  1. Transit sessions
  2. Peering sessions (IXP or PNI)
  3. Customer sessions
  • If you have more than one router, your routers synchronize their learnings via IBGP

First, you have to learn a route from outside; then you can use it to send packets there.

  • In an advanced network, your router sees the prefixes from the target network on different paths
  • As there is more than one way of learning prefixes, you have to define where the outbound packet should be sent

Fill in the form to download the white paper!

    Just let us know if you would like to schedule a meeting or if we should call you back.

    I can unsubscribe at any time in the future by clicking on the unsubscribe link in every email or by sending an email to newsletter@de-cix.in.

    By downloading DE-CIX’s white papers I agree that DE-CIX collects the above data within the scope of its e-mail service and stores it in a personalized user profile for the purpose of automated marketing activities and analyses. I can withdraw my consent for future profiling activities at any time via email to datenschutz@de-cix.in. More information can be found in our privacy policy.

    This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.