RD – Route Distinguisher
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RD – Route Distinguisher

A BGP speaker can only advertise one route per IP prefix and can therefore completely omit a route to a VPN if its addressing overlaps a different VPN, creating a one or the other scenario. The solution to this problem is to add an 8-byte RD (Route Distinguisher) to the IPv4 address, creating a unique 12byte VPN-IPv4 address.

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