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

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loopback (CT1 interface)
Use loopback to enable local, remote, or external payload loopback on the CT1 interface.
Use undo loopback to restore the default.
Syntax
loopback { local | payload | remote }
undo loopback
Default
Loopback is disabled.
Views
CT1 interface view
Default command level
2: System level
Parameters
local: Enables the CT1 interface to perform local loopback.
payload: Enables the interface to perform external payload loopback.
remote: Enables the interface to perform remote loopback.
Usage guidelines
Loopback is mainly used to check the condition of interfaces or cables. Disable loopback in other cases.
You can bundle timeslots on a CT1 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 down.
Examples
# Enabled remote loopback on interface T1 2/0/0.
<Sysname> system-view
[Sysname] controller t1 2/0/0
[Sysname-T1 2/0/0] loopback remote
reset counters controller t1
Use reset counters controller t1 to clear the controller counter for a CT1 interface.
Syntax
reset counters controller t1 interface-number
Views
User view
Default command level
2: System level
Parameters
interface-number: Interface number.