Administrator Guide

tunnel hop-limit
Configure the method to set the IPv4 time-to-live or the IPv6 hop limit value in the outer tunnel header.
Syntax
tunnel hop-limit value
To restore the default tunnel hop-limit, use the no tunnel hop-limit command.
Parameters
value Enter the hop limit (ipv6) or time-to-live (ipv4) value to include in the tunnel
header. The range is from 0 to 255. The default is 64.
Defaults 64 (Time-to-live for IPv4 outer tunnel header or hop limit for IPv6 outer tunnel header)
Command Modes INTERFACE TUNNEL (conf-if-tu)
Command
History
Version Description
9.7(0.0) Introduced on the S6000-ON.
9.3(0.0) Introduced on the S6000, S4810, S4820T, Z9000.
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.
tunnel destination
Set a destination endpoint for the tunnel.
Syntax
tunnel destination {ip-address | ipv6–address}
To delete a tunnel destination address, use the no tunnel destination {ip-address | ipv6–
address} command.
Parameters
ip-address Enter the destination IPv4 address for the tunnel.
ipv6–address Enter the destination IPv6 address for the tunnel.
Defaults none
Command Modes INTERFACE TUNNEL (conf-if-tu)
Command
History
Version Description
9.7(0.0) Introduced on the S6000-ON.
9.3(0.0) Introduced on the S4810, S4820T, S6000 and Z9000.
Usage
Information
The tunnel interface is inoperable without a valid tunnel destination address for the configured Tunnel
mode.
To establish a logical tunnel to the particular destination address, use the destination address of the
outer tunnel header. If you configure a tunnel interface or source address, the tunnel destination must be
compatible.
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}
1262 Tunneling