Como suele ocurrir, la gente de cisco nos brinda uno de esos documentos en los que solo el títulos no tiene desperdició: “Using BGP Community Values to Control Routing Policy in Upstream Provider Network”

http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00801475b2.shtml

http://www.cisco.com/application/pdf/paws/28784/bgp-community.pdf

 En ocasiones resulta complicado localizar las políticas de community de la gente que nos rodea ya que algunos operadores de tránsitos la consideran información interna que puede cambiar y no quieren tener que programar cualquier cambio en dicha información, pero mas o menos se encuentra.

• Telia Sonera (AS 1299) Nuestros amigos de Telia lo publican en RIPE: http://www.db.ripe.net/whois?form_type=simple&full_query_string=&searchtext=as1299&submit.x=0&submit.y=0&submit=Search
• Coogent (AS 174) Los de coogent idem de lo mismo: http://www.db.ripe.net/whois?form_type=simple&full_query_string=&searchtext=as174&do_search=Search
  Ademas de ofrecernoslo en su guia de usuario: http://www.onesc.net/communities/as174/User_Guide_V5.pdf
• Interoute (AS8928) – https://hub.interoute.com/communities.aspx
• T-systems DTAG – Tsystems (AS 3320 ) Lo recogen en un bonito documento para sus clientes de transito: http://www.onesc.net/communities/as3320/AS3320_BGP_Communities_v1.1.pdf
• TATA – Teleglobe (AS 6453) – Estos directamente pasan de todo aunque los podemos clasificar como Tier-1

Adicionalmente destacar una razonable recopilación de documentación de diferentes AS recopilado en una unica pagina: http://www.onesc.net/communities/

TELIA Sonera

remarks: ———————————————————————————————————–
remarks: This Autonomous System is present at LINX, TIX, MIX, VIX, DE-CIX, PARIX and AMS-IX.
remarks: Peering Requests: peering-request@telia.net
remarks: Existing peerings: peering@telia.net
remarks: ———————————————————————————————————–
remarks: BGP COMMUNITY SUPPORT FOR AS1299 TRANSIT CUSTOMERS:
remarks:
remarks: Community Action
remarks: ——— ——
remarks: 1299:50 Set local pref 50 within AS1299 (lowest possible)
remarks: 1299:150 Set local pref 150 within AS1299 (equal to peer, backup)
remarks:
remarks: European peers/ix-points US peers/ix-points Asia peers/ix-points
remarks: Community Action Community Action Community Action
remarks: ——— ———————— ——— ———————— ——— ———————-
remarks: 1299:200x All peers Europe incl: 1299:500x All peers US incl: 1299:700x All peers Asia incl:
remarks:
remarks: 1299:201x Peers at TIX – -
remarks: 1299:202x Peers at MIX – -
remarks: 1299:205x Peers at PARIX – -
remarks: 1299:206x Peers at DE-CIX – -
remarks: 1299:207x Peers at AMS-IX – -
remarks: 1299:208x Peers at LINX – -
remarks: 1299:210x Peers at VIX – -
remarks:
remarks: 1299:250x Sprint/1239 1299:550x Sprint/1239 -
remarks: 1299:251x Savvis/3561 1299:551x Savvis/3561 -
remarks: 1299:252x Verio/2914 1299:552x Verio/2914 -
remarks: 1299:253x Abovenet/6461 1299:553x Abovenet/6461 -
remarks: 1299:254x FT/5511 1299:554x FT/5511 -
remarks: 1299:255x GBLX/3549 1299:555x GBLX/3549 -
remarks: 1299:256x Level3/3356 1299:556x Level3/3356 -
remarks: 1299:257x UUnet/702 1299:557x UUnet/701 -
remarks: – 1299:558x AT&T/7018 -
remarks: 1299:259x Telefonica/12956 1299:559x Telefonica/12956 -
remarks: 1299:260x BT/Concert/5400 – -
remarks: – 1299:561x Qwest/209 -
remarks: 1299:263x Teleglobe/6453 1299:563x Teleglobe/6453 -
remarks: 1299:264x DTAG/3320 1299:564x DTAG/3320 -
remarks: 1299:265x Swisscom/3303 – -
remarks: 1299:268x AOL/1668 1299:568x AOL/1668 -
remarks: 1299:269x Tiscali/3257 1299:569x Tiscali/3257 -
remarks: 1299:270x UPC/6830 – -
remarks: – 1299:572x AT&T/7132 -
remarks: 1299:273x Cogent/174 1299:573x Cogent/174 -
remarks: 1299:274x Telecom Italia/6762 1299:574x Telecom Italia/6762 -
remarks: 1299:275x Tele2/1257 – -
remarks: – 1299:576x Bell/577 -
remarks: – 1299:577x Telus/852 -
remarks: – 1299:578x XO Comm/2828 -
remarks: – 1299:579x Time Warner/4323 -
remarks: – 1299:580x Cablevision/6128 -
remarks: – - -
remarks: 1299:283x Tele Denmark/3292 – -
remarks: 1299:284x Cable & Wireless DE/1273 1299:584x Cable & Wireless DE/1273 -
remarks: 1299:285x Colt/8220 – -
remarks: 1299:286x KPN/286 – -
remarks: 1299:287x China Netcom/4837 1299:587x China Netcom/4837 1299:787x China Netcom/4837
remarks: 1299:288x China Telecom/4134 – 1299:788x China Telecom/4134
remarks:
remarks: Where x is number of prepends (x=0,1,2,3) or do NOT announce (x=9)
remarks: ———————————————————————————————————–
remarks: Route Flap Damping Policy according to RIPE recommendation ftp://ftp.ripe.net/ripe/docs/ripe-229.txt
remarks: ———————————————————————————————————–
mnt-by: TELIANET-RR
source: RIPE # Filtered

COOGENT:

remarks: For peering inquiries send email to
.
+
Community Support Definitions for Customers
+
1. Communities controlling Cogent’s internal use of
customer routes by means of local preference:
+
All customer routes announced to Cogent will
receive a default local preference of 130.
+
Community Effect
174:10 set local pref to 10 – least prefered
174:70 set local pref to 70 – below peers
174:120 set local pref to 120 – below customer default
174:125 set local pref to 125 – below customer default
174:130 set local pref to 130 – customer default
174:135 set local pref to 135 – above customer default
174:140 set local pref to 140 – above customer default
+
2. Communities controlling Cogent’s further distribution
and announcement of customer routes:
+
Community Effect
174:990 do not send route to BGP customers or peers
174:991 do not send route to peers
+
3. Communities controlling Cogent’s AS path prepending
for customer routes on egress:
+
Community Effect
174:3000 do not announce
174:3001 prepend 174 1 time
174:3002 prepend 174 2 times
174:3003 prepend 174 3 times
+
4. Communities tagging the source of routes
+
Community Description
174:21000 peer route learned in NA
174:21001 internal or customer route learned in NA
174:21100 peer route learned in EU
174:21101 internal or customer route learned in EU
+

En los ultimos años se a extendido al practica del uso de community como medio de propagar por todo Internet nuestra política de peering mas allá de nuestra frontera, es un método un tanto manual, pero al menos es algo que no requiere coordinación por parte de los administradores de los diferentes AS, cada uno publica su política y el resto la usa como mas le convenga.