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Atlantech Online Knowledge Base

Atlantech Online BGP Community Definitions

Last Updated:11/10/2011


Filtering on /24 boundary is applied - we do not re-advertise any route more specific than a /24 to external peers.

Route Acceptance Policy
Routes will not be accepted if any other community than what is listed below is being seen from customer announcements.

Prefix Type Communities

  • 7784:1000 - Customer route
  • 7784:1100 - Private Peer route
  • 7784:1200 - NSP route
  • 7784:7784 - AOI Aggregate Netblocks

NSP Prefix Origin Communities
  • 7784:1230 - Level3
  • 7784:1250 - Global Crossing
  • 7784:1260 - Tiscali
  • 7784:1270 - Savvis
  • 7784:1280 - AboveNet
  • 7784:1290 - Hurricane Electric
  • 7784:1110 - Ashburn Private peers

Community Definition - Local Preference/No-Export
By default, peer routes are assigned a local preference of 80. Customer routes learned over NSP or private peering links will never be preferred over a direct customer connection without prior approval by Atlantech Online engineering staff. This includes more specifics of customer aggregate blocks.

Atlantech provides local-preference control for customer links (settable by customer).

  • 7784:90 Set local preference 90
  • 7784:120 Set local preference 120
  • 7784:0 Set do not export beyond AS7784

By default, customer routes are assigned a local preference of 100.

  • 7784:90 Set local preference 90
  • 7784:120 Set local preference 120
  • 7784:0 Set do not export beyond AS7784

Community Definitions:

  • NSP Peer Prepend
  • NSP Peer Local Preference
  • NSP Peer No Export

Atlantech provides community values accepted by Atlantech Online to affect traffic flows off-net.

These communities are provided as-is and no guarantee is made as to their effectiveness. The routing policies of peers can and do change periodically. Atlantech Online will make a best effort to ensure that the "influence peer" community policies below work to the best of our knowledge.

Atlantech NSP Peer List:

  • Tiscali AS3257
  • Level(3) AS3356
  • Global Crossing AS3549
  • Savvis AS3561
  • AboveNet AS6461
  • Hurricane Electric AS6939

Atlantech NSP Peer List:
10:12000 Set localpref to 'peer level' on all Atlantech Tier 1 Peers
7784:1200[1-3] Prepend AS7784 1-3 times to all NSP peers
7784:12000 Do not announce to any NSP peers
666:12000 Do not announce past any NSP peers
7784:1230[1-3] Prepend AS7784 1-3 times to Level3
7784:12309 Announce only to Level3
7784:12300 Do not announce to Level3
70:3356 Set localpref to 70 in Level3
80:3356 Set localpref to 80 in Level3
90:3356 Set localpref to 90 in Level3
666:3356 Do not announce past Level3 (no-export)
7784:1250[1-3] Prepend AS7784 1-3 times to Global Crossing
7784:12509 Announce only to Global Crossing
7784:12500 Do not announce to Global Crossing
100:3549 Set localpref to 100 in Global Crossing
200:3549 Set localpref to 200 in Global Crossing
275:3549 Set localpref to 275 in Global Crossing
300:3549 Set localpref to 300 in Global Crossing
350:3549 Set localpref to 350 in Global Crossing
666:3549 Do not announce past GBLX (no-export)
7784:1260[1-3] Prepend AS7784 1-3 times to Tiscali
7784:12609 Announce only to Tiscali
7784:12600 Do not announce to Tiscali
60:3257 Set localpref to 60 in Tiscali
70:3257 Set localpref to 70 in Tiscali
80:3257 Set localpref to 80 in Tiscali
666:3257 Do not announce past Tiscali (no-export)
7784:1270[1-3] Prepend AS7784 1-3 times to Savvis
7784:12709 Announce only to Savvis
7784:12700 Do not announce to Savvis
70:3561 Set localpref to 70 in Savvis
80:3561 Set localpref to 80 in Savvis
90:3561 Set localpref to 90 in Savvis
96:3561 Set localpref to 96 in Savvis
7784:1280[1-3] Prepend AS7784 1-3 times to AboveNet
7784:12809 Announce only to AboveNet
7784:12800 Do not announce to AboveNet
60:6461 Set localpref to 60 in AboveNet
70:6461 Set localpref to 70 in AboveNet
80:6461 Set localpref to 80 in AboveNet
90:6461 Set localpref to 90 in AboveNet
180:6461 Set localpref to 180 in AboveNet
220:6461 Set localpref to 220 in AboveNet
666:6461 Do not announce past AboveNet (no-export)
7784:1290[1-3] Prepend AS7784 1-3 times to Hurricane Electric
7784:12909 Announce only to Hurricane Electric
7784:12900 Do not announce to Hurricane Electric
7784:1110[1-3] Prepend AS7784 1-3 times to Ashburn Private Peers
7784:11109 Announce only to Ashburn Private Peers
7784:11100 Do not announce to Ashburn Private Peers
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