Command Reference Guide

SROS Command Line Interface Reference Guide ATM Sub-Interface Config Command Set
5991-2114 © Copyright 2005 Hewlett-Packard Development Company, L.P. 690
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.
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
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