Command Line Reference Guide

Usage
Information
A value of 0 copies the inner packet hop limit (ipv6) or time-to-live (ipv4) in the
encapsulated packet to the tunnel header hop limit (ipv6) or time-to-live (ipv4)
value.
ip unnumbered
Configure a tunnel interface to operate without a unique explicit IPv4 address and select the interface
from which the tunnel will borrow its address.
Syntax ip unnumbered {interface-type interface-number}
Use the no ip unnumbered command to set the tunnel back to default logical
address. If the tunnel was previously operational, this will make the tunnel interface
operationally down, unless the tunnel also has an IPv6 address configured..
Parameters
interface-type
interface-
number
Enter the interface type, followed by a slot number.
Defaults None
Command
Modes
INTERFACE TUNNEL
Command
History
Version 9.4(0.0) Introduced on the MXL.
Usage
Information
The ip unnumbered command will fail in two condition:
• If the logical ip address is configured.
• If the tunnel mode is ipv6ip (where ip address over tunnel interface is not
possible).
To ping the unnumbered tunnels the logical address route information should be
present in both the ends.
NOTE: The ip unnumbered command can specify an interface name that does not yet exist, or does
not yet have a configured IPv6 address. The tunnel interface is not changed to the operationally up
state until logically ip address is identified from the one of the address family.
1302
Tunneling