DELL 9.8(0.0) User Manual

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.

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

Enter the interface type, followed by the type, slot and port 
information.

Defaults

None.

Command 
Modes

INTERFACE TUNNEL

Command 
History

Version

Description

9.7(0.0)

Introduced on the S6000-ON.

9.5(0.1)

Introduced on the Z9500.

9.4(0.0)

Introduced on the S4810, S4820T.

9.3(0.1)

Introduced on the 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.

Tunneling 

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