Reference Guide

Interfaces | 433
mtu
s z
Set the maximum Link MTU (frame size) for an Ethernet interface.
Syntax
mtu value
To return to the default MTU value, enter no mtu.
Parameters
Defaults
1554
Command Modes
INTERFACE
Command History
Usage Information
If the packet includes a Layer 2 header, the difference between the link MTU and IP MTU (ip mtu
command) must be enough bytes to include the Layer 2 header
Example
The VLAN contains tagged members with Link MTU of 1522 and IP MTU of 1500 and untagged
members with Link MTU of 1518 and IP MTU of 1500. The VLAN’s Link MTU cannot be higher
than 1518 bytes and its IP MTU cannot be higher than 1500 bytes.
T Increase the screen refresh rate.
t Decrease the screen refresh rate.
q Return to the CLI prompt.
Table 20-2. monitor Command Menu Options
Key Description
S6000
value
Enter a maximum frame size in bytes.
Z-Series Range: 594-12000
Default: 1554
Version 9.0.2.0 Introduced on then S6000.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.2.1.0 Introduced on the S4810
Table 20-3. Difference between Link MTU and IP MTU
Layer 2 Overhead Link MTU and IP MTU Delta
Ethernet (untagged) 18 bytes
VLAN Tag 22 bytes
Untagged Packet with VLAN-Stack Header 22 bytes
Tagged Packet with VLAN-Stack Header 26 bytes