Administrator Guide

Layer 2 Switching Commands 429
Command Modes
Privileged Exec
User Guidelines
This command has no usage guidelines.
Example
a11-39#show system mtu
System Jumbo MTU size is 9216 bytes
system jumbo mtu
Use the system jumbo mtu command to globally configure the link
Maximum Transmission Unit (MTU) on all interfaces, IP/IPv6 interfaces,
VLAN interfaces, and port channel interfaces for forwarded and system-
generated frames. The link MTU is the size of the largest Ethernet frame that
can be transmitted on an interface without fragmentation. Frames received
on an interface are dropped if they exceed the link MTU. Frames larger than
this size generated by the system are fragmented before transmission.
This command deprecates the mtu, ip mtu, and ipv6 mtu commands.
Use the no form of the command to reset the MTU to the default.
Syntax
system jumbo mtu frame size
no system jumbo mtu
• frame size —The maximum frame size, in bytes, received by the system
which is not forwarded.
Default Configuration
The default MTU size is 1518 bytes (1522 bytes for VLAN tagged frames).
Command Modes
Global Configuration mode
2CSNXXX_SWUM204.book Page 429 Monday, January 25, 2016 1:25 PM