HP MSR2000/3000/4000 Router Series Interface Command Reference

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Syntax
link-protocol { hdlc | ppp }
Default
PPP is used.
Views
POS interface view
Predefined user roles
network-admin
Parameters
hdlc: Specifies High-level Data Link Control (HDLC) as the link layer protocol of the interface.
ppp: Specifies the Point-to-Point protocol (PPP) as the link layer protocol of the interface.
Examples
# Specify HDLC as the link protocol of interface POS 5/1.
<Sysname> system-view
[Sysname] interface pos 5/1
[Sysname-Pos5/1] link-protocol hdlc
loopback
Use loopback to enable loopback for a POS interface.
Use undo loopback to disable loopback.
Syntax
loopback { local | remote }
undo loopback
Default
Loopback is disabled.
Views
POS interface view
Predefined user roles
network-admin
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.