ipv6 unnumbered
Configure a tunnel interface to operate without a unique IPv6 address and select the interface from
which the tunnel borrows its address.
Syntax ipv6 unnumbered {interface-type interface-number}
To set the tunnel back to default logical address use the no ipv6 unnumbered
command. If the tunnel was previously operational, the tunnel interface is
operationally down unless you also configure the tunnel IPv4 address.
Parameters interface-type
interface-
number
Enter the interface type, followed by the type, slot and port
information.
interface-type
interface-
number
(OPTIONAL) Instead of entering the keyword interface
followed by the interface type, slot and port information, as
above, you can enter the interface type, followed by just a
slot number.
Defaults None.
Command
Modes
INTERFACE TUNNEL
Command
History Version Description
9.7(0.0) Introduced on the S6000-ON.
9.3(0.1) Introduced on the S6000 and Z9000.
9.4(0.0) Introduced on the S4810, S4820T, S6000 and Z9000.
Usage
Information The ip unnumbered command fails in two conditions:
• If the logical ip address is configured.
• If Tunnel mode is ipv6ip (where ip address over tunnel interface is not possible).
To ping the unnumbered tunnels, the logical address route information must be
present at both the ends.
NOTE: The ipv6 unnumbered command can specify an interface name that
does not exist or does not have a configured IPv6 address. The tunnel
interface is not changed to operationally up until the logical ip address is
identified from one of the address family.
Usage
Information The ipv6 unnumbered command will fail if the tunnel interface already has an
explicit IPv6 address assigned. Likewise the ipv6 address command will fail if ipv6
unnumbered is already configured. While unlikely, an interface can be configured
to be ipv6 unnumbered for IPv6 while also having an explicit IPv4 address.
Tunneling 1593