howto/Bird-communities.md
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@@ -29,6 +29,10 @@ bw = min(up,down) for asymmetric connections
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(64511, 32) :: encrypted with unsafe vpn solution
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(64511, 33) :: encrypted with safe vpn solution (but no PFS - the usual OpenVPN p2p configuration falls in this category)
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(64511, 34) :: encrypted with safe vpn solution with PFS
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+
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+Propagation:
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+- - for latency pick max(received_route.latency, link_latency)
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+- - for encryption and bandwidth pick min between received BGP community and peer link
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```
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For example, if your peer is 12ms away and your link speed is 250Mbit/s and you are peering using OpenVPN P2P, then the community string would be (3, 24, 33).
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