HP MSR2000/3000/4000 Router Series Interface Command Reference

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# Set the number of interframe filling tags to 5 on interface E1 2/0.
<Sysname> system-view
[Sysname] controller e1 2/0
[Sysname-E1 2/0] itf number 5
loopback (CE1/PRI interface)
Use loopback to enable loopback and set the loopback mode.
Use undo loopback to restore the default.
Syntax
loopback { local | payload | remote }
undo loopback
Default
Loopback is disabled.
Views
CE1/PRI interface view
Predefined user roles
network-admin
Parameters
local: Sets the interface to operate in local loopback mode.
payload: Sets the interface to operate in external payload loopback mode.
remote: Sets the interface to operate in external loopback mode.
Usage guidelines
Loopback is mainly used to check the condition of interfaces or cables. Disable loopback in other cases.
You can bundle timeslots on the CE1/PRI interface to form a serial interface and encapsulate it with PPP.
After you enable loopback on this serial interface, it is normal that the state of the link layer protocol is
reported as down.
Examples
# Set interface E1 2/0 to operate in internal loopback mode.
<Sysname> system-view
[Sysname] controller e1 2/0
[Sysname-E1 2/0] loopback local
pri-set (CE1/PRI interface)
Use pri-set to bundle timeslots on the CE1/PRI interface into a PRI set.
Use undo pri-set to remove the bundle.
Syntax
pri-set [ timeslot-list list ]
undo pri-set