Informational BGP Communities: Origin tagging

Route origin tagging

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 region (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

Edge Switch

Switch Code

Switch BGP Com

Metro

Metro Code

Metro BGP Com

Country

M49 Region Code (Country)

Country BGP Com

Continent

M49 Region Code (Continent)

Continent BGP Com

edge01.dtm1

23115

65101:23115

DTM

23000

65102:23000

Germany

276

65103:276

Europe

150

65104:150

edge01.dus1

9065

65101:9065

DUS

9000

65102:9000

Germany

276

65103:276

Europe

150

65104:150

Unknown

65535

65101:65535

ALL

65535

65102:65535

ALL

65535

65104:65535

ALL

65535

65104:65535

Examples

Example 1

A prefix has the following BGP Communities attached to it: 

  • 65101:5079
  • 65102:5000
  • 65103:784
  • 65104:142
     

From these BGP Communities you can deduce that this particular prefix has been injected at edge01.dxb1 (65101:5079) in metro region Dubai (65102:5000) which is in the UAE (65103:784), Asia (65104:142).

Example 2

A prefix has the following BGP Communities attached to it:

  • 65101:6054 
  • 65102:6000 
  • 65103:250 
  • 65104:150

From these BGP Communities you can deduce that this particular prefix has been injected at edge01.mrs1 (65101:6054) in metro region Marseille (65102:6000) which is in France (65103:250), Europe (65104:150).

Examples

Example 1

A prefix has the following BGP Communities attached to it:

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

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

Example 2

A prefix has the following BGP Communities attached to it:

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

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

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