The Constant Company, LLC

AS Number 20473

BGP communities are a method to group a set of prefixes and apply some attributes, such as local preference, or route filtering, to all the members of that group. This grouping is done through assigning a "community" value to an IP prefix.

For example, a network administrator can create a community with the value 65000:100 and assign it to all the prefixes that belong to a specific customer. The routers in the network can then be configured to give a higher local preference to all prefixes that have that community value, ensuring that traffic for that customer will always be preferred over other customers.

A common use of BGP communities is to control the distribution of routes between different ASNs. For example, a network operator may use communities to ensure that only certain prefixes are exported to specific customers or peers.

This page lists known meanings of BGP communities for AS20473

Quick Search:

Full Listing:

  Community Description
  20473:100 Prefix learned from Transit
  20473:200 Prefix learned from Public Peer
  20473:300 Prefix learned from Private Peer
  20473:400 Prefix originated by Customer
  20473:4000 Prefix originated by Customer
  20473:500 Prefix originated by 20473
  20473:nnn Prefix learned from AS$0
  20473:100:nnn Prefix learned from Transit AS$0
  20473:200:nnn Prefix learned from Public Peer AS$0
  20473:300:nnn Prefix learned from Private Peer AS$0
  20473:13 United States - Chicago, IL
  20473:14 United States - Atlanta, GA
  20473:15 United States - Dallas, TX
  20473:16 United States - Seattle, WA
  20473:17 United States - Los Angeles, CA
  20473:18 United States - San Jose, CA
  20473:19 Europe - London, GB
  20473:20 Europe - Amsterdam, NL
  20473:21 Europe - Paris, FR
  20473:22 Europe - Frankfurt, DE
  20473:23 Asia & Pacific - Tokyo, JP
  20473:24 Asia & Pacific - Sydney, AU
  20473:25 Asia & Pacific - Singapore, SG
  20473:26 Asia & Pacific - Korea, KR
  20473:27 Europe - Stockholm, SE
  20473:28 Americas - Mexico, MX
  20473:29 Europe - Warsaw, PL
  20473:30 Americas - Sao Paulo, BR
  20473:31 Europe - Madrid, ES
  20473:32 Asia & Pacific - Melbourne, AU
  20473:33 Americas - Toronto, CA
  20473:34 United States - Honolulu, HI
  20473:35 Asia & Pacific - Mumbai, IN
  20473:43 Asia & Pacific - Bangalore, IN
  20473:44 Asia & Pacific - New Delhi, IN.
  20473:6000:nnn Do not announce to AS$0
  20473:6001:nnn Prepend 1x to AS$0
  20473:6002:nnn Prepend 2x to AS$0
  20473:6003:nnn Prepend 3x to AS$0
  20473:6009:nnn Set metric to 0 for AS$0
  20473:6099:nnn Force announce to AS$0
  20473:6601 Do not announce to IXP peers
  20473:6602 Announce to IXP route servers only
  20473:6000 Do not announce to any peer
  20473:64609 Set Metric to 0 to all AS’s
  20473:6001 Prepend 1x to all AS’s
  20473:6002 Prepend 2x to all AS’s
  20473:6003 Prepend 3x to all AS’s
  20473:666 Export blackhole to all AS’s

Some of this data was sourced from the lg.ring.nlnog.net project

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