![]() IP datagram packets are encapsulated and decapsulated with a GRE header and an outer IP header as the IP Datagram packets enter or exit the GRE tunnel. A "tunnel interface" can be created by using normal interface configuration commands. GRE (Generic Routing Encapsulation) also supports encapsulating IPv4 broadcast and multicast traffic.Ĭisco GRE tunnelling technology uses a logical interface called as "tunnel interface". ![]() GRE (Generic Routing Encapsulation) allows Routing of IP packets between private IPv4 networks which are separated over public IPv4 internet. Generic routing encapsulation (GRE) was initially developed by Cisco, but later become industry standard ( RFC 1701, RFC 2784, RFC 2890). Generic routing encapsulation (GRE) is an IP encapsulation protocol which is used to transport IP packets over a network. ![]()
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