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• Duplicate Address Detection (DAD) is not currently supported with IPv6 tunnels. Make sure tunnel
endpoints do not have duplicate IP addresses.
• Neighbor Discovery (ND) is not supported with IPv6 tunnels.
• If a tunnel source port is a multi-homed IPv4 source, the tunnel will use the first IPv4 address only.
For proper tunnel operation, use the ip address option.
Configuring a manual IPv6 tunnel
You can use a manually configured tunnel to connect two isolated IPv6 domains. You should deploy
this point-to-point tunneling mechanism if you need a permanent and stable connection.
To configure a manual IPv6 tunnel, enter commands such as the following on a Layer 3 Switch running
both IPv4 and IPv6 protocol stacks on each end of the tunnel.
device(config)#interface tunnel 1
device(config-tnif-1)#tunnel source ethernet 1/3/1
device(config-tnif-1)#tunnel destination 10.162.100.1
device(config-tnif-1)#tunnel mode ipv6ip
device(config-tnif-1)#ipv6 enable
This example creates tunnel interface 1 and assigns a link local IPv6 address with an automatically
computed EUI-64 interface ID to it. The IPv4 address assigned to Ethernet interface 1/3/1 is used as the
tunnel source, while the IPv4 address 10.168.100.1 is configured as the tunnel destination. The tunnel
mode is specified as a manual IPv6 tunnel. Finally, the tunnel is enabled. Note that instead of entering
ipv6 enable , you could specify an IPv6 address, for example, ipv6 address 2001:DB8:384d:34::/64
eui-64 , which would also enable the tunnel.
Syntax: [no] interfacetunnel number
For the number parameter, specify a value between 1-8.
Syntax: [no] tunnelsource ipv4-address | ethernet port | loopback number | ve number
The tunnel source can be an IP address or an interface.
For ipv4-address , use 8-bit values in dotted decimal notation.
The ethernet | loopback | ve parameter specifies an interface as the tunnel source. If you specify an
Ethernet interface, also specify the port number associated with the interface. If you specify a loopback,
VE, or interface, also specify the loopback, VE, or number, respectively.
Syntax: [no] tunneldestination ipv4-address
Specify the ipv4-address parameter using 8-bit values in dotted decimal notation.
Syntax: [no] tunnelmode ipv6ip
ipv6ip indicates that this is an IPv6 manual tunnel.
Syntax: ipv6 enable
The ipv6 enable command enables the tunnel. Alternatively, you could specify an IPv6 address, which
would also enable the tunnel.
Syntax: ipv6 address ipv6-prefix / prefix-length [ eui-64 ]
The ipv6 address command enables the tunnel. Alternatively, you could enter ipv6 enable , which
would also enable the tunnel.
Specify the ipv6-prefix parameter in hexadecimal format using 16-bit values between colons as
documented in RFC 2373.
Specify the prefix-length parameter as a decimal value. A slash mark (/) must follow the ipv6-prefix
parameter and precede the prefix-length parameter. The eui-64 keyword configures the global address
Configuring a manual IPv6 tunnel
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