@Baptiste ,
here cisco documentation about RPKI
cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/217020-bgp-rpki-with-xr7-cisco8000-whitepaper.html
The router establishes a TCP session with a validator (IP: X.X.X.X, port 3323) in order to download the ROA cache to the router’s memory.
Best regards
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