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65.1 Overview
Use these commands to configure the Maximum Transmission Unit (MTU) on specific interfaces. This
specifies the maximum packet size in a single frame. Higher MTU is more efficient as more data can be
carried along a fixed size of protocol overheads in a frame. A higher MTU, however, also means each
packet occupies a slow link for a longer time, which causes delay to the next packets. Larger packets
are also more prone to errors.
A good packet size is the size just before the packet becomes fragmented. One way to find this value
for the MTU is to use ping with a specified packet size. Keep trying different packet size values until the
packet needs to be fragmented. You then add the number of bytes you need for the header to this
number.
65.2 MTU Commands
This table describes the commands.
Table 242 MTU Commands
COMMAND
interface port-channel <aid>
max-frame-size <frame-size>
no max-frame-size
exit
show interfaces config <aid> max-
frame-size
Chapter 65 MTU
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DESCRIPTION
Enters the sub-command mode for configuring
the specified ports.
aid: <msc|ge|pon>-<slot>-<port>
Configures the interface's maximum frame size
for IP packets.
: 64-9216 bytes (Default: 9216)
frame-size
Sets the interface's maximum frame size for IP
packets to the default value of 9216 bytes.
Leaves the interface configuration sub-
command mode.
Displays the specified port's maximum frame
size setting.
aid: <msc|ge|pon>-<slot>-<port>
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