1. Introduction
This document describes the BGP communities which are used by GTT (AS3257).
These communities can be used for their pure informational value and/or to modify the behavior of the routing service provided by AS3257.
2. Egress Communities
These are communities which are relayed from AS3257 to their peers.
2.1 Origin Communities
2.1.1 General
| Value | Description |
| 3257:4000 | tags a GTT customer route. |
| 3257:5000 | tags a GTT originated route. |
2.1.1.1 Accounting
| Value | Description |
| 3257:6001 | temporary dbb class 1 (allocation policy to be defined) |
| 3257:6002 | temporary dbb class 2 (allocation policy to be defined) |
| 3257:6003 | temporary dbb class 3 (allocation policy to be defined) |
| 3257:6004 | temporary dbb class 4 (allocation policy to be defined) |
| 3257:6005 | temporary dbb class 5 (allocation policy to be defined) |
2.1.2 Exchanges
| Value | Description |
| 3257:4400-4499 | tags EU exchange points (details upon request). |
| 3257:4500-4599 | tags US exchange points (details upon request). |
2.1.3 Geographical
| Value | Description |
| 3257:50001 | route originated in Europe |
| 3257:50002 | route originated in the US and Canada |
| 3257:50003 | route originated in Asia |
| 3257:50100 | Regions by route miles |
| 3257:50110 | route originated in central Europe |
| 3257:50111 | route originated in outer Europe |
| 3257:50120 | route originated in US east coast |
| 3257:50121 | route originated in US west coast |
| 3257:50122 | route originated in US Canada outer regions |
| 3257:50130 | route originated in Asia |
| 3257:51100 | route originated in the US east coast |
| 3257:51101 | route originated in NYC |
| 3257:51102 | route originated in WAS |
| 3257:51103 | route originated in MIA |
| 3257:51104 | route originated in ATL |
| 3257:51105 | route originated in BOS |
| 3257:51106 | route originated in PHI |
| 3257:51107 | route originated in CHA |
| 3257:51108 | route originated in ORL |
| 3257:51200 | route originated in the US west coast |
| 3257:51201 | route originated in SJC |
| 3257:51202 | route originated in LAX |
| 3257:51203 | route originated in PAO |
| 3257:51204 | route originated in SEA |
| 3257:51205 | route originated in PHX |
| 3257:51206 | route originated in LAS |
| 3257:51207 | route originated in SLC |
| 3257:51300 | route originated in the US central |
| 3257:51301 | route originated in CHI |
| 3257:51302 | route originated in DAL |
| 3257:51303 | route originated in DEN |
| 3257:51304 | route originated in STL |
| 3257:51305 | route originated in MIN |
| 3257:51306 | route originated in IAH |
| 3257:51400 | route originated in Canada |
| 3257:51401 | route originated in TOR |
| 3257:51402 | route originated in MTL |
| 3257:51403 | route originated in VAN |
| 3257:53000 | route originated in GR |
| 3257:53001 | route originated in ATH |
| 3257:53100 | route originated in NL |
| 3257:53101 | route originated in AMS |
| 3257:53200 | route originated in BE |
| 3257:53201 | route originated in BRU |
| 3257:53202 | route originated in ANR |
| 3257:53300 | route originated in FR |
| 3257:53301 | route originated in PAR |
| 3257:53302 | route originated in MRS |
| 3257:53400 | route originated in ES |
| 3257:53401 | route originated in MAD |
| 3257:53402 | route originated in BCN |
| 3257:53520 | route originated in LU |
| 3257:53530 | route originated in IE |
| 3257:53531 | route originated in DUB |
| 3257:53590 | route originated in BG |
| 3257:53591 | route originated in SOF |
| 3257:53700 | route originated in LT |
| 3257:53701 | route originated in VIL |
| 3257:53900 | route originated in IT |
| 3257:53901 | route originated in TRN |
| 3257:53902 | route originated in MIL |
| 3257:53903 | route originated in BLQ |
| 3257:53904 | route originated in ROM |
| 3257:53905 | route originated in CAG |
| 3257:53906 | route originated in PSR |
| 3257:53907 | route originated in FLR |
| 3257:53908 | route originated in GOA |
| 3257:53909 | route originated in NAP |
| 3257:53910 | route originated in PMO |
| 3257:53911 | route originated in QPA |
| 3257:54000 | route originated in RO |
| 3257:54001 | route originated in BUC |
| 3257:54100 | route originated in CH |
| 3257:54101 | route originated in ZUR |
| 3257:54102 | route originated in BSL |
| 3257:54200 | route originated in CZ |
| 3257:54201 | route originated in PRG |
| 3257:54210 | route originated in SK |
| 3257:54211 | route originated in BTS |
| 3257:54300 | route originated in AT |
| 3257:54301 | route originated in VIE |
| 3257:54400 | route originated in UK |
| 3257:54401 | route originated in LON |
| 3257:54402 | route originated in MAN |
| 3257:54500 | route originated in DK |
| 3257:54501 | route originated in CPH |
| 3257:54600 | route originated in SE |
| 3257:54601 | route originated in STK |
| 3257:54700 | route originated in NO |
| 3257:54701 | route originated in OSL |
| 3257:54800 | route originated in PL |
| 3257:54801 | route originated in WAW |
| 3257:54900 | route originated in DE |
| 3257:54901 | route originated in FRA |
| 3257:54902 | route originated in DUS |
| 3257:54903 | route originated in HAM |
| 3257:54904 | route originated in MUC |
| 3257:54905 | route originated in BER |
| 3257:56500 | route originated in SG |
| 3257:56501 | route originated in SIN |
| 3257:56600 | route originated in JP |
| 3257:56601 | route originated in TYO |
| 3257:58520 | route originated in HK (Hong Kong) |
| 3257:58521 | route originated in HKG |
| 3257:59000 | route originated in TR |
| 3257:59001 | route originated in IST |
| 3257:50999 | multi-national prefix (not applicable, legacy) |
2.1.4 Private Interconnect
| Value | Description |
| 3257:30000-39999 | Auto-incremental number of private interconnects |
2.1.5 Loopbacks
Last digits of the loopback IP address from the router receiving the prefix.
| Value | Description |
| 3257:8000-8999 | loopback IP address |
2.2 Traffic Engineering Communities
3. Ingress Communities
Communities which are relayed from the peers to AS3257. Prior to activation of community announcement, it is needed to send an email to [email protected] describing the specific bgp session(s) and intended communities to ensure proper activation on the GTT equipment.
3.1 Restricted Route Propagation
3.1.1 Well-known Communities
AS3257 supports the use of well-known communities as defined in IETF RFC1997 and RFC3765.
| Value | Description |
| 65535:65281 | NO_EXPORT (RFC1997) |
| 65535:65282 | NO_ADVERTISE (RFC1997) |
| 65535:65283 | NO_EXPORT_SUBCONFED (RFC1997) |
| 65535:65284 | NOPEER (RFC3765) |
3.1.2 Do Not Announce
| Value | Description |
| 3257:2590 | do not announce in Asia (only applies to Asia regional peers). |
| 3257:2990 | do not announce in the US (only applies to US regional peers). |
| 3257:2998 | do not announce to any peer (legacy) |
| 65000:XXXX | do not announce to ASXXXX |
| 65010:XXXX | do not announce except to ASXXXX |
| 65535:65284 | do not announce to any peer |
3.2 Attribute Change
3.2.1 Prepends
| Value | Description |
| 3257:2291 | prepend 1x to any peering partner |
| 3257:2292 | prepend 2x to any peering partner |
| 3257:2293 | prepend 3x to any peering partner |
| 3257:2491 | prepend 1x in Europe (only applies to EU regional peers). |
| 3257:2492 | prepend 2x in Europe (only applies to EU regional peers). |
| 3257:2493 | prepend 3x in Europe (only applies to EU regional peers). |
| 3257:2591 | prepend 1x in Asia (only applies to Asia regional peers). |
| 3257:2592 | prepend 2x in Asia (only applies to Asia regional peers). |
| 3257:2593 | prepend 3x in Asia (only applies to Asia regional peers). |
| 3257:2991 | prepend 1x in the US (only applies to US regional peers). |
| 3257:2992 | prepend 2x in the US (only applies to US regional peers). |
| 3257:2993 | prepend 3x in the US (only applies to US regional peers). |
| 65001:XXXX | prepend 1x to ASXXXX |
| 65002:XXXX | prepend 2x to ASXXXX |
| 65003:XXXX | prepend 3x to ASXXXX |
3.2.2 Local Preference
| Value | Description |
| 3257:1980 | give routes localpref below normal customer route. |
| 3257:1970 | give routes localpref below normal peer route. |
3.3 Blackholing
Please check with our team at [email protected] first, if this is enabled for your session.
| Value | Description |
| 3257:2666 | blackhole (discard) traffic |
APPENDIX
3A.1 Ascending List of 3257:XXXX communities
| Value | Description |
| 3257:2000-2999 | Customer Control |
| 3257:4000-5000 | Route purpose |
| 3257:6000-6999 | Accounting (engineering internal use only) |
| 3257:7000-7999 | restricted route distribution (engineering internal use only) |
| 3257:8000-8999 | receiving router loopback IP address |
| 3257:9000-9999 | restricted route distribution (engineering internal use only) |
| 3257:10000-19999 | Private Interconnect egress filtering (engineering internal use only) |
| 3257:30000-39999 | Private Interconnect ingress tagging |
| 3257:50000-59999 | Geographic origin tagging |
