Service Manual

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-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.
Verison Description
9.8(0.0) Introduced on the S3048-ON and S4048-ON.
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, 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 configure the IP MTU value that is used when the IP packet is
fragmented. Instead of having to configure the IP MTU value, this value is
automatically computed by the software when you configure an interface. As a
result, the ip mtu command is not available for configuration. However, you can
continue to specify the link MTU value by using the mtu command.
Compensate for Layer 2 header when configuring link MTU on an Ethernet
interface or Dell Networking OS 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.
VLANs:
• All members of a VLAN must have same IP MTU value.
IPv4 Routing
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