Users Guide

Tunneling

Tunnel interfaces create a logical tunnel for IPv4 or IPv6 traffic. Tunneling supports RFC 2003, RFC 2473, and

4213.

DSCP, hop-limits, flow label values, open shortest path first (OSPF) v2, and OSPFv3 are supported. Internet

control message protocol (ICMP) error relay, PATH MTU transmission, and fragmented packets are not

supported.

Topics:

• Configuring a Tunnel

• Configuring Tunnel Keepalive Settings

• Configuring a Tunnel Interface

• Configuring Tunnel Allow-Remote Decapsulation

• Configuring the Tunnel Source Anylocal

Configuring a Tunnel

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 address must

be an IPv4 address.

• If the tunnel mode is IPv6, the tunnel source address and the tunnel destination address must be an IPv6

address.

• If the tunnel mode is IPv6 or IPIP, you can use either an IPv6 address or an IPv4 address for the logical

address 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 IPv4 traffic).

Dell(conf)#interface tunnel 1

Dell(conf-if-tu-1)#tunnel source 30.1.1.1

Dell(conf-if-tu-1)#tunnel destination 50.1.1.1

Dell(conf-if-tu-1)#tunnel mode ipip

Dell(conf-if-tu-1)#ip address 1.1.1.1/24

Dell(conf-if-tu-1)#ipv6 address 1::1/64

Dell(conf-if-tu-1)#no shutdown

Dell(conf-if-tu-1)#show config

interface Tunnel 1

ip address 1.1.1.1/24

ipv6 address 1::1/64

tunnel destination 50.1.1.1

tunnel source 30.1.1.1

tunnel mode ipip

no shutdown

Tunneling 997