Mtu - Allied Telesis IE340 Series Command Reference Manual

I C
NTERFACE OMMANDS

MTU

mtu
Overview Use this command to set the Maximum Transmission Unit (MTU) size for interfaces,
where MTU is the maximum packet size that interfaces can transmit. The MTU size
setting is applied to both IPv4 and IPv6 packet transmission.
Use the no variant of this command to remove a previously specified Maximum
Transmission Unit (MTU) size, and restore the default MTU size. For example, the
VLAN interface default is 1500 bytes.
mtu <68-1582>
Syntax
no mtu
Default The default MTU size, for example 1500 bytes for VLAN interfaces.
Mode Interface Configuration
Usage notes If a device receives an IPv4 packet for Layer 3 switching to another interface with
an MTU size smaller than the packet size, and if the packet has the 'don't
fragment' bit set, then the device will send an ICMP 'destination unreachable' (3)
packet type and a 'fragmentation needed and DF set' (4) code back to the source.
For IPv6 packets bigger than the MTU size of the transmitting interface, an ICMP
'packet too big' (ICMP type 2 code 0) message is sent to the source.
Note that
Examples To configure an MTU size of 1555 bytes on vlan2, use the commands:
awplus#
awplus(config)#
awplus(config-if)#
To restore the MTU size to the default MTU size of 1500 bytes on vlan2, use the
commands:
awplus#
awplus(config)#
awplus(config-if)#
Related show interface
commands
Command Version 5.4.7-1.1: Behavior change when MTU set to less than 1500 on FS980M and
changes GS980M.
Version 5.5.1-0.1: Layer 3 jumbo frames supported on SBx908 GEN2 and x950.
C613-50631-01 Rev A
Parameter Description
<68-1582>
The Maximum Transmission size in bytes.
show interface
configure terminal
interface vlan2
configure terminal
interface vlan2
Command Reference for IE340 Series
AlliedWare Plus™ Operating System - Version 5.5.3-0.x
output will only show MTU size for VLAN interfaces.
mtu 1555
no mtu
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