Supported by the GlobalNOC at Indiana University

BGP Community Controls for I2PX / AS11164

BGP Community Controls for I2PX Participants:
(reviewed by NTAC Peering and Routing WG, June 15th, 2010)
During the April 20th NTAC Peering and Routing WG call, an inquiry was made regarding support within the consolidated I2PX network for BGP communities to allow traffic control by participants. The legacy Internet2 I2PX network (AS11537) supports a set of BGP communities which allow connectors to control their traffic to/from I2PX peer networks; the legacy TransitRail network (AS11164) supports a similar set of BGP communities to provide the same functionality. To ease the transition of connections to the consolidated I2PX network the communities of both the legacy TransitRail and I2PX networks are supported on links to AS11164 as described below.

The group of communities for selective prepending and no-export are:

  • 65000:<ASN> Do not advertise at all to the peer ASN
  • 65001:<ASN> Prepend once toward peer ASN
  • 65002:<ASN> Prepend twice toward peer ASN
  • 65003:<ASN> Prepend thrice toward peer ASN
  • 65009:<ASN> Allow advertisement toward peer ASN if otherwise excluded by more general community control such as 11164:52000

The following communities can be used to blackhole traffic to more specific netblocks (up to /32):

  • 65535:666 Rewrite next hop to discard traffic (RFC7999)
  • 11164:53666 Rewrite next hop to discard traffic

The following communities can be used to alter relative preference within the consolidated I2PX network (AS11164):

  • 11164:51240 Set preference of learned route Above standard local preference value for Participant.
  • 11164:51200 Set preference of learned route Below standard local preference value for Participant.

These additional communities are available to alter relative preference. Though available, these communities are rarely used and can take substantial care to appreciate the outcome from using them:

  • 11164:51080 Set preference of learned route Below standard local preference value for Settlement Free Peers.
  • 11164:51050 Set preference of learned route Below standard local preference value for any Transit Providers (no Transit Providers exist to-date).

Additionally, these communities can be used to alter the announcement profile of your routes:

  • 11164:52000 Do not export to peers
  • 11164:52001 Prepend once to peers
  • 11164:52002 Prepend twice to peers
  • 11164:52003 Prepend thrice to peers
  • 11164:52400 Do not export to North American peers (all I2PX peers to-date)
  • 11164:52401 Prepend once to North American peers
  • 11164:52402 Prepend twice to North American peers
  • 11164:52403 Prepend thrice to North American peers
  • 11164:52300 Do not export to Extended Peers

Related communities for future use, but which are in-active in the network, at present:

  • 11164:52200 Do not export to transit
  • 11164:52201 Prepend once to transit
  • 11164:52202 Prepend twice to transit
  • 11164:52203 Prepend thrice to transit
  • 11164:52500 Do not export via peer-links in Asia-Pac
  • 11164:52501 Prepend once via peer-links in Asia-Pac
  • 11164:52502 Prepend twice via peer-links in Asia-Pac
  • 11164:52503 Prepend thrice via peer-links in Asia-Pac
  • 11164:52600 Do not export via peer-links in Europe
  • 11164:52601 Prepend once via peer-links in Europe
  • 11164:52602 Prepend twice via peer-links in Europe
  • 11164:52603 Prepend thrice via peer-links in Europe


Please let us know if you have questions, <mailto:noc@net.internet2.edu>


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