Efficient Networks
®
Router family
Command Line Interface Guide
Chapter 5: Ethernet Interface Commands
Efficient Networks
®
Page 5-37
eth mtu
Sets the maximum transfer unit for the Ethernet interface. The default is 1500 bytes.
You can set the MTU size to less than 1500 bytes, but you cannot set the MTU to
greater than 1500 bytes, even if you specify a larger value on an eth mtu command.
(RFC 1042 recommends 1500 bytes as the maximum MTU for an Ethernet network.)
To see the current MTU size for an interface that has IP enabled, use the
ipifs
command.
Mgmt Class
Network (R/W)
Input Format
eth mtu <size> [<interface>]
Parameters
Response
Command prompt.
eth restart
Stops and restarts a logical Ethernet interface. To read about logical Ethernet
interfaces, see “
IP Subnets” on page 6-1
of the Technical Reference Guide.
Certain configuration changes for a logical Ethernet interface become effective only
after the logical interface is restarted or the router is rebooted. Remember to save the
changes before the restart or reboot.
NOTE:
Use restart instead of reboot whenever possible. A restart does not affect other
interfaces, allowing their traffic to continue. For example, using restart, you can add
an IP route without killing voice traffic.
To restart an remote interface, use
remote restart
.
<size>
Maximum number of bytes that can be transferred as a unit.
<interface>
a,b
a
Integer, 0, 1 or it may be omitted if the router has only 1 Ethernet interface.
b
To specify a logical interface other than logical interface 0, specify both the port number and
the logical interface number (<port #>:<logical #>, for example, 0:1).
Ethernet interface.
