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BGP Communities

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