Informational BGP Communities

Route origin

The route server will tag all prefixes with certain BGP Communities to indicate their origin. You can use this information to determine where a certain prefix has been injected into the Ruhr-CIX/DE-CIX switching platform. This gives you the possibility to filter routes learned from the route servers based on geographical location. 

Currently we tag the following information:

  • Switch: Indicates at which switch a prefix has been injected into the Ruhr-CIX/DE-CIX platform. We tag the corresponding edge switch of the port.
    • Example: edge01.dtm1
  • Metro: The metropolitan region corresponding to the switch
    • Example: Ruhr area (Dortmund)
  • Country: The country corresponding to the above (in M.49 format)
    • Example: Germany
  • Continent: The continent corresponding to the above (in M.49 format)
    • Example: Europe

This means that every prefix you will learn from the route servers will have four (additional) BGP Communities attached which will indicate location information.

BGP Community Graph

To avoid ambiguity about the semantics of a certain BGP Community, especially when being present multiple times, we strip all BGP Communities from the range that we use for route origin tagging on import. This is:

  • 65101:*
  • 65102:*
  • 65103:*
  • 65104:*

Overview

ContinentM.49 Region Code (Continent)Continent BGP ComCountryM.49 Region Code (Country)Country BGP ComMetroMetro CodeMetro BGP Com

Edge Switch

Switch Code

Switch BGP Com

Europe EU

150

65104:150Germany DE

276

65103:276DTEM (Ruhr-CIX)2300065102:23000

edge01.dtm1

23115

65101:23115
DUS (DE-CIX)900065102:9000

edge01.dus1

9093

65101:9093

Unknown Continent

65535

65104:65535Unknown Country

65535

65104:65535Unknown Metro6553565102:65535

Unknown Switch

65535

65101:65535

Examples

Example 1

A prefix has the following BGP Communities attached to it:

  • 65104:150
  • 65103:276
  • 65102:23000
  • 65101:23115

From these BGP Communities you can deduce that this particular prefix has been injected in Europe (65104:150), Germany (65103:276) in metro region Ruhr area (65102:23000) at edge01.dtm1 (65101:23115).

Example 2

A prefix has the following BGP Communities attached to it:

  • 65104:150
  • 65103:276
  • 65102:9000
  • 65101:9065

From these BGP Communities you can deduce that this particular prefix has been injected in Europe (65104:150), Germany (65103:276) in metro region Dusseldorf (65102:9000) at edge01.dus1 (65101:9065).

Origin communities table from DE-CIX Academy: continent, country, and metro area (without origin edge device)