Reference Guide

Tunneling Commands
Tunnel interfaces create a logical tunnel for IPv4 or IPv6 traffic. You can configure DCSP, hop-limits and flow-labels. To enable
a tunnel interface, use the following commands.
Topics:
• ip unnumbered
• ipv6 unnumbered
• tunnel allow-remote
• tunnel destination
• tunnel dscp
• tunnel flow-label
• tunnel hop-limit
• tunnel mode
• tunnel source
ip unnumbered
Configure a tunnel interface to operate without a unique IPv4 address and specify the interface from which the tunnel borrows
its address.
Z9500
Syntax
ip unnumbered {interface-type slot/port}
To set the tunnel back to default logical address use the no ip unnumbered command. If the tunnel was
previously operational, the tunnel interface remains operationally down until you also configure the tunnel
IPv6 address.
Parameters
interface-type
slot/port
Enter the interface type, followed by a slot and port number.
Defaults None
Command Modes INTERFACE TUNNEL
Command
History
Version Description
9.5(0.1) Introduced on the Z9500.
9.4(0.1) Introduced on the S4810, S4820T, S6000 and Z9000.
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 the tunnel mode is IPv6IP (where an IP address over a tunnel interface is not supported).
To ping an IP-unnumbered tunnel, the logical address route information must be present at both the
source and destination ends of the tunnel.
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 status is not changed to operationally up until the logical IP address is identified from the
address family.
55
1362 Tunneling Commands