Command Line Reference Guide

ip mtu
Set the IP MTU (frame size) of the packet the RPM transmits for the line card interface. If the packet must
be fragmented, the system sets the size of the fragmented packets to the size specified in this command.
Z9500
Syntax
ip mtu value
To return to the default IP MTU value, use the no ip mtu command.
Parameters
value Enter the maximum MTU size if the IP packet is fragmented.
The range is from 576 to 9234. The default is 1500 bytes.
Defaults 1500 bytes
Command
Modes
INTERFACE
Command
History
This guide is platform-specific. For command information about other platforms,
refer to the relevant Dell Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version Description
9.2(1.0) Introduced on the Z9500.
8.3.19.0 Introduced on the S4820T.
8.3.7.0 Introduced on the S4810.
8.1.1.0 Introduced on the E-Series ExaScale.
6.1.1.0 Introduced on the E-Series.
Usage
Information
When you enter the no mtu command, the system reduces the ip mtu value to
1536 bytes. To return the IP MTU value to the default, use the no ip mtu
command.
Compensate for Layer 2 header when configuring link MTU on an Ethernet
interface or the system may not fragment packets. If the packet includes a Layer 2
header, the difference between the link MTU and IP MTU (the ip mtu command)
must be enough bytes to include for the Layer 2 header.
Link MTU and IP MTU considerations for Port Channels and VLANs are as follows
Port Channels:
• All members must have the same link MTU value and the same IP MTU value.
• The Port Channel link MTU and IP MTU must be less than or equal to the link
MTU and IP MTU values configured on the channel members. For example, if
the members have a link MTU of 2100 and an IP MTU 2000, the Port Channel’s
MTU values cannot be higher than 2100 for link MTU or 2000 bytes for IP MTU.
824
IPv4 Routing