50TunnelingTunnel interfaces create a logical tunnel for IPv4 or IPv6 traffic. Tunneling supports RFC 2003, RFC 2473,and 4213.DSCP, hop-limits, flow label values, OSPFv2, and OSPFv3 are also supported. ICMP error relay, PATH MTUtransmission, and fragmented packets are not supported.Configuring a TunnelYou can configure a tunnel in IPv6 mode, IPv6IP mode, and IPIP mode.You can configure a tunnel in IPv6 mode, IPv6IP mode, and IPIP mode.• If the tunnel mode is IPIP or IPv6IP, the tunnel source address and the tunnel destination addressmust be an IPv4 address.• If the tunnel mode is IPv6, the tunnel source address and the tunnel destination address must be anIPv6 address.• If the tunnel mode is IPv6 or IPIP, you can use either an IPv6 address or an IPv4 address for the logicaladdress of the tunnel, but in IPv6IP mode, the logical address must be an IPv6 address.The following sample configuration shows a tunnel configured in IPv6 mode (carries IPv6 and IPv4traffic).Dell(conf)#interface tunnel 1Dell(conf-if-tu-1)#tunnel source 30.1.1.1Dell(conf-if-tu-1)#tunnel destination 50.1.1.1Dell(conf-if-tu-1)#tunnel mode ipipDell(conf-if-tu-1)#ip address 1.1.1.1/24Dell(conf-if-tu-1)#ipv6 address 1::1/64Dell(conf-if-tu-1)#no shutdownDell(conf-if-tu-1)#show config!interface Tunnel 1ip address 1.1.1.1/24ipv6 address 1::1/64tunnel destination 50.1.1.1tunnel source 30.1.1.1tunnel mode ipipno shutdownThe following sample configuration shows a tunnel configured in IPV6IP mode (IPv4 tunnel carries IPv6traffic only):Dell(conf)#interface tunnel 2Dell(conf-if-tu-2)#tunnel source 60.1.1.1Dell(conf-if-tu-2)#tunnel destination 90.1.1.1Dell(conf-if-tu-2)#tunnel mode ipv6ipDell(conf-if-tu-2)#ipv6 address 2::1/64Dell(conf-if-tu-2)#no shutdownDell(conf-if-tu-2)#show config!834 Tunneling
