HP 7000 dl Router manual Config-atm 1.1#mtu

SROS Command Line Interface Reference GuideATM Sub-Interface Config Command Set

mtu <size>

Use the mtu command to configure the maximum transmit unit (MTU) size for the active interface. Use the no form of this command to return to the default value.

Syntax Description

<size>	Configures the window size for transmitted packets. The valid ranges for the
	various interfaces are listed below:
	Ethernet (eth 0/1)	64 to 1500
	virtual Frame Relay sub-interfaces (fr 1.16)	64 to 1520
	virtual PPP interfaces (ppp 1)	64 to 1500
	loopback interfaces	64 to 1500

Default Values

<size>	The default values for the various interfaces are listed below:
	Ethernet (eth 0/1)	1500
	virtual Frame Relay sub-interfaces (fr 1.16)	1500
	virtual PPP interfaces (ppp 1)	1500
	loopback interfaces	1500

Command Modes

(config-interface)#	Interface Configuration Mode required (applies only to IP interfaces)
	Valid interfaces include: ATM sub-interface, Ethernet, virtual Frame Relay
	sub-interfaces, virtual PPP interfaces, and loopback interfaces.

Functional Notes

OSPF will not become adjacent on links where the MTU sizes do not match. If router A and router B are exchanging hello packets but their MTU sizes do not match, they will never reach adjacency. This is by design and required by the RFC.

Usage Examples

The following example specifies an MTU of 1200 on the ATM sub-interface 1.1:

(config)#interface atm 1.1

(config-atm 1.1)#mtu 1200

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