`tunnel path-mtu-discovery`

Enables Path MTU Discovery (PMTUD).

Syntax

tunnel path-mtu-discovery

{ age-timer { time | infinite } | disable }

no tunnel path-mtu-discovery

{ age-timer { time | infinite } | disable }

Command Default

PMTUD is enabled by default.

Parameters

age-timer: Configures the time after which the path MTU resets to its original value.
time: Sets the time after which the path MTU resets to its original value. Valid values are 10 to 30 minutes. The default value is 10 minutes.
infinite: Sets the aging time as infinite, that is, disables aging for PMTUD.
disable: Disables PMTUD.

Modes

Tunnel interface configuration mode

Usage Guidelines

ICX 7150 and ICX 8100 devices do not support tunnels.

The no form of the command disables PMTUD and resets the aging to the default value of 10 minutes.

Examples

The following example changes the reset time (default age timer) to a value of 25.

device# configure terminal 
device(config)# tunnel interface 1
device(config-tnif-1)# tunnel path-mtu-discovery age-timer 25

The following example re-enables PMTUD after it has been disabled.

device# configure terminal 
device(config)# tunnel interface 1
device(config-tnif-1)# tunnel path-mtu-discovery disable

tunnel path-mtu-discovery