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Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-08
Chapter 12 Configuring Interface Characteristics
Configuring the System MTU
Beginning in privileged EXEC mode, follow these steps to exclude a port from SVI state-change
calculations:
This example shows how to configure an access or trunk port in an SVI to be excluded from the line-state
st
atus calculation:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface gigabitethernet1/0/2
Switch(config-if)# switchport autostate exclude
Switch(config-if)# exit
Configuring the System MTU
The default maximum transmission unit (MTU) size for frames received and sent on all interfaces on the
switch or switch stack is 1500 bytes. You can change the MTU size to support switched jumbo frames
on all Gigabit Ethernet and 10-Gigabit Ethernet interfaces and to support routed frames on all routed
ports.
• The system jumbo MTU value applies to switched packets on the Gigabit Ethernet and 10-Gigabit
Ethernet ports of the switch or switch stack. Use the system mtu jumbo bytes global configuration
command to specify the system jumbo MTU value.
• The system routing MTU value applies only to routed packets on all routed ports of the switch or
switch stack. Use the system mtu routing bytes global configuration command to specify the
system routing MTU value.
When configuring the system MTU values, follow these guidelines:
• The switch does not support the MTU on a per-interface basis.
• You can enter the system mtu bytes global configuration command on a Catalyst 3750-E switch, but
the command does not take effect on the switch. This command only affects the system MTU size
on Fast Ethernet ports on Catalyst 3750 members in a mixed hardware switch stack. In this stack,
you can use the system mtu bytes global configuration command on a Catalyst 3750-E member to
co
nfigure the system MTU size on a Catalyst 3750 member.
• The system mtu, system mtu jumbo, and system mtu routing global configuration commands do
not take effect in these cases:
–
When you enter the system mtu command on a Catalyst 3750-E or 3560-E switch
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
interface interface-id Specify a Layer 2 interface (physical port or port
channel), and enter interface configuration mode.
Step 3
switchport autostate exclude Exclude the access or trunk port when defining the
status of an SVI line state (up or down)
Step 4
end Return to privileged EXEC mode.
Step 5
show running config interface interface-id
show interface in
terface-id switchport
(Optional) Show the running configuration.
Verify the configuration.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.
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