Administrator Guide

ip unnumbered
Configure a tunnel interface to operate without a unique IPv4 address and select the interface from
which the tunnel borrows its address.
Syntax ip unnumbered {interface-type interface-number}
To set the tunnel back to default logical address use the no ip unnumbered
command. If the tunnel was previously operational, the tunnel interface is
operationally down unless you also configure the tunnel IPv6 address.
Parameters
interface-type
interface-
number
Enter the interface type, followed by a slot number.
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(0.1) 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 ip 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.
1656
Tunneling