Service Manual
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, Dell
Networking OS sets the size of the fragmented packets to the size specied in this command.
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 (Gigabit Ethernet and 10-Gigabit Ethernet interfaces)
Command History
This guide is platform-specic. For command information about other platforms, see the relevant Dell Networking
OS Command Line Reference Guide.
Verison Description
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
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.
6.1.1.0 Introduced on the E-Series.
Usage Information When you enter the no mtu command, Dell Networking OS reduces the ip mtu value to 1536 bytes. To return the
IP MTU value to the default, use the no ip mtu command.
Starting with Dell Networking OS Release 9.2(0.2), the ip mtu command is not supported to congure the IP
MTU value that is used when the IP packet is fragmented. Instead of having to congure the IP MTU value, this
value is automatically computed by the software when you congure an interface. As a result, the ip mtu command
is not available for conguration. However, you can continue to specify the link MTU value by using the mtu
command.
Compensate for Layer 2 header when conguring link MTU on an Ethernet interface or Dell Networking OS may
not fragment packets. If the packet includes a Layer 2 header, the dierence 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.
794 IPv4 Routing