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BGP COMMUNITIES

Internet, Optimized

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 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 Europe
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

2.1.5 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

OUR GARTNER RATING

Gartner Peer Insights Reviews
 
82%
As of 25 July, 2024

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