Show Mtu; Enabling Or Disabling The Path Mtu Discovery Protocol; Purpose; Commands - Enterasys Matrix DFE-Gold Series Configuration Manual

Enabling or Disabling the Path MTU Discovery Protocol

Enabling or Disabling the Path MTU Discovery Protocol

Purpose

To enable or disable the path MTU (Maximum Transmission Unit) discovery protocol on the
device. Because ports with transmission speeds higher than 100 Mbps are capable of transmitting
frames up to a maximum of 10,239 bytes, it is necessary to have the path MTU discovery protocol
enabled if jumbo frames are allowed in the network. If the system receives a frame larger than the
destination port supports, it will send an "ICMP destination unreachable" error message
indicating to the transmitting station that it must fragment the frame.

Commands

For information about...

show mtu

set mtu
clear mtu
show mtu
Use this command to display the status of the path MTU discovery protocol on the device.
Syntax
show mtu
Parameters
None.
Defaults
None.
Mode
Switch command, Read‐Only.
Example
This example shows how to display path MTU discovery status:
Matrix(rw)->show mtu
MTU discovery status: Enabled
2-90 Startup and General Configuration
Note: By default, path MTU discovery is enabled on the device and jumbo frame support is disabled
on all ports. When jumbo frame support is enabled with the set port jumbo command, as described
in "set port jumbo" on page 4-28, path MTU discovery should not be disabled.
show mtu
Refer to page...
2-90
2-91
2-91