Filename: communities.txt Revision: f9e1ab44604e7897bee664e386b302b81254a91f Timestamp:: Mon Nov 29 14:17:51 2021 +0100 Url: http://www.as3257.net/communities.txt 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 behaviour 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 3257:4000 tags a GTT customer route. 3257:5000 tags a GTT originated route. 2.1.1.1 Accounting 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 3257:4400-4499 tags EU exchange points 3257:4500-4599 tags US exchange points 2.1.3 Geographical 3257:50001 route originated in Europe 3257:50002 route originated in the US and Canada 3257:50003 route originated in Asia 3257:50004 route originated in South America 3257:50005 route originated in Africa 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 3257:50140 route originated in South America 3257:50150 route originated in Africa 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 3257:51109 route originated in BAL 3257:51110 route originated in TPA 3257:51111 route originated in PIT 3257:51112 route originated in BUF 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 3257:51208 route originated in SFO 3257:51209 route originated in SND 3257:51210 route originated in REN 3257:51211 route originated in HON 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 3257:51307 route originated in AUS 3257:51308 route originated in MCL 3257:51309 route originated in DET 3257:51310 route originated in KAN 3257:51311 route originated in CMH 3257:51312 route originated in BTR 3257:51400 route originated in CA (Canada) 3257:51401 route originated in TOR 3257:51402 route originated in MTL 3257:51403 route originated in VAN 3257:51404 route originated in HAL 3257:51405 route originated in MCT 3257:51406 route originated in CGY 3257:52700 route originated in ZA (South Africa) 3257:52701 route originated in JHB 3257:53000 route originated in GR 3257:53001 route originated in ATH 3257:53100 route originated in NL 3257:53101 route originated in AMS 3257:53102 route originated in HIL 3257:53103 route originated in RTD 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 3257:53521 route originated in LUX 3257:53530 route originated in IE 3257:53531 route originated in DUB 3257:53580 route originated in FI 3257:53581 route originated in HEL 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 3257:53912 route originated in VCE 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 3257:54103 route originated in GVA 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 3257:54502 route originated in GLS 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 3257:54906 route originated in NUE 3257:55000 route originated in HU 3257:55001 route originated in BUD 3257:56500 route originated in SG 3257:56501 route originated in SIN 3257:56600 route originated in JP 3257:56601 route originated in TYO 3257:56602 route originated in OSK 3257:56700 route originated in AU (Australia) 3257:56701 route originated in SYD 3257:56702 route originated in MEL 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 3257:59002 route originated in ANK 3257:59003 route originated in GEB 3257:59730 route originated in AE (United Arab Emirates) 3257:59731 route originated in DDX 3257:59740 route originated in QA (Qatar) 3257:59741 route originated in DOH 3257:59750 route originated in BR (Brasil) 3257:59751 route originated in SAO 3257:59760 route originated in MX (Mexico) 3257:59761 route originated in MEX 3257:59770 route originated in RU (Russia) 3257:59771 route originated in MSC 3257:50999 multi-national prefix (not applicable, legacy) 2.1.4 Private Interconnect 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. 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 bgp-filters@gtt.net 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, RFC3765 and RFC8326. 65535:0 GRACEFUL_SHUTDOWN (RFC8326) 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 3257:2490 do not announce in Europe (only applies to EU regional peers). 3257:2590 do not announce in Asia (only applies to Asia regional peers). 3257:2690 do not announce in Africa (only applies to Africa regional peers). 3257:2890 do not announce in the South America (only applies to South America 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 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). 3257:2691 prepend 1x in Africa (only applies to Asia regional peers). 3257:2692 prepend 1x in Africa (only applies to Asia regional peers). 3257:2693 prepend 1x in Africa (only applies to Asia regional peers). 3257:2891 prepend 1x in the South America (only applies to US regional peers). 3257:2892 prepend 2x in the South America (only applies to US regional peers). 3257:2893 prepend 3x in the South America (only applies to US 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 65535:0 give routes localpref of zero (RFC 8326) 3257:1980 give routes localpref below normal customer route. 3257:1970 give routes localpref below normal peer route. 3.2.2.1 Local Preference inside l3vpns 3257:2170 give routes 170 localpref 3257:2150 give routes 150 localpref 3257:2130 give routes 130 localpref 3257:2110 give routes 110 localpref 3257:2090 give routes 90 localpref 3257:2070 give routes 70 localpref 3257:2050 give routes 50 localpref 3257:2030 give routes 30 localpref 3.2.3 De-Tour 3257:1000 de-tour packets off the direct path 3257:1001 route only visible inside as3257 3.3 Blackholing Please check with our team at bgp-filters@gtt.net first, if this is enabled for your session. 3257:2666 blackhole (discard) traffic APPENDIX A.1 Ascending List of 3257:XXXX communities 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) 3257:10000-10999 receiving router loopback ip address pool 2 3257:20000-29999 Private Interconnect egress filtering (engineering internal use only) 3257:30000-39999 Private Interconnect ingress tagging 3257:50000-59999 Geographic origin tagging