White Papers

Defaults 0 (Mapped original packet flow-label value to tunnel header flow-label value)
Command Modes INTERFACE TUNNEL (conf-if-tu)
Supported Modes Full–Switch
Command
History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.3(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
Usage
Information
This command is only valid for tunnel interfaces with an IPv6 outer header.
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)
Supported Modes Full–Switch
Command
History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.3(0.0) Introduced on the MXL 10/40GbE Switch IO Module.
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
Supported Modes Full–Switch
Command
History
Version Description
9.9(0.0) Introduced on the FN IOM.
1172 Tunneling