BGP Communities

Colt implements community marking on it's network to control the announcement of routes and hence flow of traffic into and out of the network. Customers can set some of these communities on prefixes announced to Colt.

Manipulation Communities

The following communities can be used by customers to alter their route advertisements within the Colt network and to Colt peers.

Local Preference

The following communities allow a customer to set a local preference on a prefix advertised to Colt. The default local preference set on all received customer routes is 111.

Set local preference to 120 8220:63700
Set local preference to 40 8220:63900

Advertisements to Colt Peers

Using the following format 8220:63aee a customer can control how their routes are advertised to peers.

Possible values for a:

Do not advertise 0
Prepend x1 1
Prepend x2 2
Prepend x3 3

Possible values for ee:

City Region Code
London Europe 01
Frankfurt Europe 02
Paris Europe 03
Berlin Europe 04
Milan Europe 05
Madrid Europe 06
Barcelona Europe 07
Amsterdam Europe 08
Brussels Europe 09
Zurich Europe 10
Geneva Europe 11
Vienna Europe 12
Stockholm Europe 14
Copenhagen Europe 17
Lisbon Europe 21
Rome Europe 23
Turin Europe 24
Tokyo Asia Pacific 25
Osaka Asia Pacific 26
Hong Kong Asia Pacific 27
Singapore Asia Pacific 28
Ashburn (Washington) North America 39
San Jose North America 40
Bucharest Europe 42
Warsaw Europe 43
Sydney Oceania 44
All Upstreams Global 92
All Peers (Not Upstreams) Global 99

For example setting 8220:63008 on an advertised route will not announce that route to all peers in Amsterdam and setting 8220:63210 will prepend 8220 8220 on the route to all peers in Zurich.

Special Communities

The following communities allow a customer to blackhole or not advertise a prefix.

Type Description Community
No advertise Peers Do not advertise the prefix to any peer 8220:63099
Blackhole Blackhole all traffic. Can be exact customer prefix as documented in an IRR or a /32 host route. This may blackhole on our interconnect partners networks in addition to the Colt network. 8220:63999
No Export Do not advertise this prefix over any eBGP peering session 8220:63800

Informational Communities

Colt routes/prefixes are tagged with a country and region of origin.

Region of Origin Communities

Europe 8220:65000
North America 8220:65001
Asia Pacific 8220:65002
Africa 8220:65003
South America 8220:65004
Oceania 8220:65005

City of Origin Communities

City Country Community
London United Kingdom 8220:65010
Birmingham United Kingdom 8220:65011
Paris France 8220:65020
Lyon France 8220:65022
Toulouse France 8220:65023
Marseille France 8220:65024
Bordeaux France 8220:65025
Frankfurt Germany 8220:65030
Cologne Germany 8220:65031
Duesseldorf Germany 8220:65032
Hamburg Germany 8220:65033
Hannover Germany 8220:65034
Berlin Germany 8220:65035
Stuttgart Germany 8220:65036
Munich Germany 8220:65037
Amsterdam Netherlands 8220:65040
Madrid Spain 8220:65050
Barcelona Spain 8220:65070
Valencia Spain 8220:65051
Milan Italy 8220:65060
Turin Italy 8220:65061
Rome Italy 8220:65062
Brussels Belgium 8220:65080
Vienna Austria 8220:65090
Warsaw Poland 8220:65100
Prague Czech Republic 8220:65101
Bratislava Solvakia 8220:65102
Budapest Hungary 8220:65103
Bucharest Romania 8220:65104
Sofia Bulgaria 8220:65105
Zurich Switzerland 8220:65110
Basel Switzerland 8220:65111
Geneva Switzerland 8220:65120
Stockholm Sweeden 8220:65130
Helsinki Finland 8220:65131
Dublin Ireland 8220:65140
Rouen France 8220:65151
Nantes France 8220:65152
Copenhagen Denmark 8220:65160
Lisbon Portugal 8220:65180
New York United States 8220:65201
Newark United States 8220:65201
Chicago United States 8220:65250
Seattle United States 8220:65251
San Jose United States 8220:65252
Los Angeles United States 8220:65253
Phoenix United States 8220:65254
Dallas United States 8220:65255
Atlanta United States 8220:65256
Washington United States 8220:65257
Hong Kong Hong Kong 8220:65300
Osaka Japan 8220:65301
Tokyo Japan 8220:65303
Singapore Singapore 8220:65302
Sydney Australia 8220:65304