Juniper JUNOSE SOFTWARE 11.2.X - LINK LAYER CONFIGURATION GUIDE 7-7-2010 Configuration Manual page 397

loopback
mru
mtu
pos description
Copyright © 2010, Juniper Networks, Inc.
Use the no version to restore the default value, 300.
See load-interval.
Use to specify the type of loopback for a POS interface.
internal—Connects the local transmitted signal to the local received signal.
line—Connects the received network signal directly to the transmit network signal.
When configured in line loopback mode, the router never receives data from the
network.
Example
host1(config-if)#loopback line
Use the no version to clear the loopback.
See loopback.
Use to set the maximum allowable size of the MRU.
Specify a value in the range 1–9996 bytes.
Example
host1(config-if)#mru 1000
Use the no version to restore the default value, 4470.
See mru.
Use to set the maximum allowable size of the MTU.
Specify a value in the range 1–9996 bytes.
Example
host1(config-if)#mtu 1000
Use theno version to restore the default value, 4470.
See mtu.
Use to assign a text description or an alias to a POS HDLC interface.
You can use this command to help you identify the interface and keep track of interface
connections.
The description or alias can be a maximum of 80 characters.
Use "show interfaces pos" on page 367 to display the text description.
Example
Chapter 11: Configuring Packet over SONET
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