Cisco Systems 3750E Use the system mtu jumbo Use the system mtu routing, System mtu jumbo bytes

Chapter 11 Configuring Interface Characteristics

Configuring the System MTU

Table 11-5	System MTU Values
Configuration		System MTU	System Jumbo MTU	System Routing MTU
Catalyst 3750-E-		The system MTU value does not	Use the system mtu jumbo	Use the system mtu routing
only stack		take effect on a Catalyst 3750-E	bytes command.	bytes command.
		or 3560-E switch, but you can
Catalyst 3750-E			The range is from 1500 to 9198	The range is from 1500 to the
		enter the command on the
switch			bytes.	system jumbo MTU value (in
		switch. 1
				bytes).	2
Catalyst 3560-E
switch
Mixed hardware		Use the system mtu bytes	Use the system mtu jumbo	Use the system mtu routing
stack		command, which takes effect	bytes command.	bytes command.
		only on Catalyst 3750 members.1	The range is from 1500 to 9000	The range is from 1500 to the
		The range is from 1500 to 1998	bytes.	system MTU value (in bytes).2
		bytes.
Catalyst 3750-only		Use the system mtu bytes	Use the system mtu jumbo	Use the system mtu routing
stack		command.	bytes command.	bytes command.
Catalyst 3750		The range is from 1500 to 1998	The range is from 1500 to 9000	The range is from 1500 to the
switch		bytes.	bytes.	system MTU value (in bytes).
Catalyst 3560 switch

1.If you use the system mtu bytes command on a Catalyst 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 MTU size for switched and routed packets:

	Command		Purpose
Step 1	configure terminal		Enter global configuration mode.
Step 2	system mtu jumbo bytes		(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 Table 11-5.
Step 3	system mtu routing bytes		(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 11-5.
		Catalyst 3750-E and 3560-E Switch Software Configuration Guide
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