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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:

2020 in review

2020: Year in Review

As 2021 approaches, we thought it's a good time to look back at all the important milestones we've achieved in 2020. Moreover, we wanted...

BGP community attributes

The dark side of BGP community attributes

A while ago, RIPE Labs published the two-part article BGP Communities - A Weapon for the Internet. That may have been a bit of...

filter bgp announcements

Using communities to filter BGP announcements

When first starting out with BGP, the typical way to advertise a network's prefixes is using the network statement with a prefix filter and...

BGP Communities

Understanding BGP Communities

After reading the title of this article you may be thinking of small neighborhoods in the world's most-connected cities where BGP-minded people live together,...