R3102-R3103-HP 6600/HSR6600 Routers Interface Command Reference

200
Default command level
2: System level
Parameters
local: Enables internal loopback.
remote: Enables external loopback.
Usage guidelines
Loopback is intended for test use. Disable it otherwise.
If you enable loopback on a POS interface encapsulated with PPP, it is normal that the state of the link
layer protocol is reported up.
Loopback and clock slave cannot be set at the same time; otherwise, POS interfaces cannot be
connected successfully.
Examples
# Enable internal loopback on interface POS 2/1/0.
<Sysname> system-view
[Sysname] interface pos 2/1/0
[Sysname-Pos2/1/0] loopback local
mtu
Use mtu to set the MTU size of the POS interface.
Use undo mtu to restore the default.
Syntax
mtu size
undo mtu
Default
The MTU size of the POS interface is 1500 bytes.
Views
POS interface view
Default command level
2: System level
Parameters
size: Sets the size (in bytes) of the maximum transmission unit (MTU) in the range of 128 to 2000. When
a HIM module is installed to the HSR6602 or 6604/6608/6616 with MCP, the value range of the MTU
size can be the following:
HIM module model MTU value ran
g
e
HIM-MSP2P 128 to 9600
HIM-MSP4P 128 to 9600
HIM-PS1P 128 to 9600