Layer 3 Routing Commands 1791Tunnel Interface CommandsDell EMC Networking N3000/N3100/N4000 Series SwitchesDell EMC Networking provides for the creation, deletion, and managementof tunnel interfaces. They are dynamic interfaces that are created and deletedby user configuration.Tunnel interfaces are used for the following purposes.• IPv4 tunnels• IPv6 tunnelsEach router interface (port or VLAN interface) may have associated tunnelinterfaces. Each interface can have multiple tunnel interfaces. There is no setlimit to the number of tunnel interfaces associated with a router interface.There is a compile platform limitation to the number of tunnel interfacesavailable to the entire system.To support IPv4 to IPv6 transition, Dell EMC Networking supportsconfigured tunnels (RFC 4213) and automatic 6to4 tunnels (RFC 3056).6to4 tunnels are automatically formed for IPv4 tunnels carrying IPv6 traffic.The automatic tunnels IPv4 destination address is derived from the 6to4 IPv6address of the tunnel’s next hop. Dell EMC Networking can act as a 6to4border router that connects a 6to4 site to a 6to4 domain. The border routersends and receives tunneled traffic from routers in the 6to4 domain thatinclude other 6to4 border routers and 6to4 relay routers.Commands in this SectionThis section explains the following commands:interface tunnelUse the interface tunnel command in Global Configuration mode to enterthe interface configuration mode for a tunnel.interface tunnel tunnel mode ipv6ipshow interfaces tunnel tunnel sourcetunnel destination –
