R0106-HP MSR Router Series Interface Command Reference(V7)

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loopback
Use loopback to enable a type of loopback on a CT3 interface.
Use undo loopback to restore the default.
Syntax
loopback { local | payload | remote }
undo loopback
Default
Loopback is disabled on CT3 interfaces.
Views
CT3 interface view
Predefined user roles
network-admin
Parameters
local: Enables internal loopback.
payload: Enables external payload loopback.
remote: Enables external loopback.
Usage guidelines
Loopback is intended for testing only. Disable the feature when the interface is operating correctly.
If a CT3 interface encapsulated with PPP is placed in a loopback, the state of the link layer protocol is
reported as down.
Examples
# Enable internal loopback on interface T3 2/4/0.
<Sysname> system-view
[Sysname] controller t3 2/4/0
[Sysname-T3 2/4/0] loopback local
mdl
Use mdl to configure MDL message detection and transmission on a CT3 interface.
Use undo mdl to restore the default.
Syntax
mdl { data { eic string | fic string | gen-no string | lic string | pfi string | port-no string | unit string } |
detect | generate { idle-signal | path | test-signal } }
undo mdl [ data [ eic | fic | gen-no | lic | pfi | port-no | unit ] | detect | generate [ idle-signal | path
| test-signal ] ]
Default
Periodic MDL detection is disabled. CT3 interfaces do not send MDL messages.