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BGP Communities

The 4 well known BGP communities:

Internet: advertise the prefix to all BGP neighbors.
No-Advertise: don’t advertise the prefix to any BGP neighbors.
No-Export: don’t advertise the prefix to any eBGP neighbors.
Local-AS: don’t advertise the prefix outside of the sub-AS (this one is used for BGP confederations).

Read more in the articles below: