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158 CHAPTER 7: POS INTERFACE CONFIGURATION COMMANDS
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■ 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.
Example # Enable internal loopback on interface POS 1/0.
<Sysname> system-view
[Sysname] interface pos 1/0
[Sysname-Pos1/0] loopback local
mtu
Syntax mtu size
undo mtu
View POS interface view
Parameter size: Size (in bytes) of the maximum transmission unit (MTU). MTU range and the
default value vary with device.
Description Use the
mtu command to set the MTU size of the POS interface.
Use the undo mtu command to restore the default.
The MTU setting of the POS interface can affect the assembly and fragmentation
of IP packets on it.
In QoS, the length of queues is limited. If MTU on the interface is too small, there
is likelihood for a large packet to be fragmented into so many fragments that the
queue cannot hold them and as such discard them. To avoid this situation, you can
extend the queue length by using the qos fifo queue-length command in
interface view. The default queuing mechanism on the interface is FIFO. For more
information on how to configure queuing, refer to “FIFO Queuing Configuration
Commands” on page 1809.
Related command: display interface pos.
Example # Set MTU of POS interface 0/0/0 to 1492.
<Sysname> system-view
[Sysname] interface pos 1/0
[Sysname-Pos1/0] mtu 1492
scramble
Syntax scramble
undo scramble