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 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

2.1.5 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