Cisco Catalyst 3750-X Software Configuration Manual page 419

Chapter 13 Configuring Interface Characteristics
Table 13-5 System MTU Values (continued)
Configuration
Catalyst 3750-only stack
Catalyst 3750 switch
Catalyst 3560 switch
1. If you use the system mtu bytes command on a Catalyst 3750-X or 3750-E member in a mixed hardware stack, the setting takes effect on the Fast Ethernet
ports of Catalyst 3750 members.
2. The system routing MTU value is the applied value, not the configured value.
The upper limit of the system routing MTU value is based on the switch or switch stack configuration
and refers to either the currently applied system MTU or the system jumbo MTU value. For more
information about setting the MTU sizes, see the system mtu global configuration command in the
command reference for this release.
Beginning in privileged EXEC mode, follow these steps to change the MTUsize for switched and routed
packets:
Command
Step 1 configure terminal
Step 2 system mtu jumbo bytes
Step 3 system mtu routing bytes
Step 4
system mtu bytes
Step 5
end
Step 6
copy running-config startup-config
Step 7 reload
Step 8 show system mtu
OL-21521-01
system mtu command
Use the system mtu bytes
command.
The range is from 1500 to 1998
bytes.
system jumbo mtu command
Use the system mtu jumbo
bytes command.
The range is from 1500 to 9000
bytes.
Purpose
Enter global configuration mode.
(Optional) Change the MTU size for all Gigabit
Ethernet and 10-Gigabit Ethernet interfaces on the
switch or the switch stack. For information about the
range for bytes, see
(Optional) Change the system MTU for routed ports.
You can also set the maximum MTU to be advertised by
the routing protocols that support the configured MTU
size. The system routing MTU is the maximum MTU
for routed packets and is also the maximum MTU that
the switch advertises in routing updates for protocols
such as OSPF.
For information about the range for bytes, see
Table 13-5.
This command is not supported on switches
Note
running the LAN base feature set.
(Optional) In a mixed hardware stack, change the MTU
size for all Fast Ethernet interfaces on the Catalyst 3750
members.
The range is 1500 to 1998 bytes; the default is
1500 bytes.
This command does not apply to
Note
Catalyst 3560-X switches.
Return to privileged EXEC mode.
Save your entries in the configuration file.
Reload the operating system.
Verify your settings.
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
Configuring the System MTU
system routing mtu command
Use the system mtu routing
bytes command.
The range is from 1500 to the
system MTU value (in bytes).
Table 13-5.
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