Explains GRE-in-UDP concepts, describing protocol functionality, encapsulation techniques, deployment scenarios, and operational benefits for flexible tunneling solutions.
A GRE-in-UDP protocol is a network protocol that
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encapsulates Generic Routing Encapsulation (GRE) tunnels within a User Datagram Protocol (UDP) packet to facilitate load balancing and improve performance over networks, and
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enables a router to encapsulate GRE packets—including source and destination port information—within a UDP header, send the UDP packet through the tunnel, and allow the destination device to de-encapsulate the UDP packet.
Cisco Catalyst SD-WAN supports generic routing encapsulation (GRE) with UDP for IPv4 and IPv6 traffic.