Informational BGP communities

Route origin

The route server will mark all routes with certain BGP Communities to indicate their origin. You can use this information to determine where a certain route has been injected into the 1-IX EU switching platform. This gives you the option to filter routes learned from the route servers based on geographical location. 

Currently we mark the following information:

Switch: Indicates at which switch a route has been injected into the 1-IX EU platform. We tag the corresponding edge switch of the port.

• Example: sw02-eqx-waw

Metro: The metropolitan region corresponding to the switch.

• Example: Warsaw

Country: The country corresponding to the above ( UN M49 format).

• Example: Poland

Continent: The continent corresponding to the above ( UN M49 format).

• Example: Europe

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

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:                 
 

• Large Communities
  • 50263:1911:*
  • 50263:1912:*
  • 50263:1913:*
  • 50263:1914:*

where 50263 is the corresponding route server ASN at 1-IX EU IXP.

Overview

Please note: If the exact location of a customer cannot be determined from the 1-IX EU database, or in certain special cases, we mark these routes with 6510{1-4}:65535 and 50263:191{1-4}:65535, meaning "unknown".

Examples

Example 1

A route has the following BGP Communities attached to it:

• 50263:1914:150
• 50263:1913:804
• 50263:1912:101
• 50263:1911:21

From these BGP Communities you can deduce that this particular route has been injected in Europe (6695:1914:150), Ukraine (6695:1913:804) in metro region Kyiv (6695:1912:101) at sw02-nt-kv (6695:1911:21) at 1-IX EU (ASN 50263).

Example 2

A route has the following BGP Communities attached to it:

• 50263:1914:150
• 50263:1913:724
• 50263:1912:107
• 50263:1911:45

From these BGP Communities you can deduce that this particular route has been injected in Europe (50263:1914:150), Poland (50263:1913:724) in metro region Warsaw (50263:1912:107) at sw02-eqx-waw (50263:1911:45).

Filtering Example 1

If you would like to receive only Ukrainian routes and filter all the others, you can accept only 50263:1913:804 ,and reject others.

set policy-options community 1-IX-EU-import-Ukraine members large:50263:1913:804  
set policy-options policy-statement import-1-IX-EU term 1 from community 1-IX-EU-import-Ukraine  
set policy-options policy-statement import-1-IX-EU term 1 then accept  
set policy-options policy-statement import-1-IX-EU then reject  
show | compare  
[edit policy-options]  
+ policy-statement import-1-IX-EU {  
+    term 1 {  
+       from community 1-IX-EU-from-Ukraine;  
+       then accept;  
+    }  
+    then reject;  
+ }  
[edit policy-options]  
+ community 1-IX-EU-import-Ukraine members large:50263:1913:804  
 

Filtering Example 2

If you would like to receive all European routes and filter the United Kingdom and Slovakian , you can reject 50263:1913:826 and 50263:1913:703 and then accept only 50263:1914:150

set policy-options community 1-IX-EU-import-UK members large:50263:1913:826   
set policy-options community 1-IX-EU-import-Slovakia members large:50263:1913:703  
set policy-options community 1-IX-EU-import-Europe members large:50263:1914:150  
set policy-options policy-statement import-1-IX-EU term 1 from community 1-IX-EU-import-UK  
set policy-options policy-statement import-1-IX-EU term 1 from community 1-IX-EU-import-Slovakia  
set policy-options policy-statement import-1-IX-EU term 1 then reject  
set policy-options policy-statement import-1-IX-EU term 2 from community 1-IX-EU-import-Europe  
set policy-options policy-statement import-1-IX-EU term 2 then accept  
set policy-options policy-statement import-1-IX-EU then reject  
# show | compare  
[edit policy-options]  
+ policy-statement import-1-IX-EU {  
+    term 1 {  
+       from community [ 1-IX-EU-import-UK 1-IX-EU-import-Slovakia ];  
+       then reject;  
+    }  
+    term 2 {  
+       from community 1-IX-EU-import-Europe;  
+       then accept;  
+    }  
+    then reject;  
+ }  
[edit policy-options]  
+ community 1-IX-EU-import-Europe members large:50263:1914:150;  
+ community 1-IX-EU-import-Slovakia members large:50263:1913:703;  
+ community 1-IX-EU-import-UK members large:50263:1913:826;