260 CHAPTER 16: FUNDAMENTAL CE3 INTERFACE CONFIGURATION COMMANDS
<Sysname> system-view
[Sysname] controller e3 2/0
[Sysname-E3 2/0] e1 1 set frame-format crc4
e1 set loopback
Syntax e1 line-number set loopback { local | payload | remote }
undo e1 line-number set loopback
View CE3 interface view
Parameter line-number: E1 line number in the range 1 to 16.
local: Sets the E1 line in internal loopback mode.
payload: Sets the E1 line in payload loopback mode.
remote: Sets the E1 line in external loopback mode.
Description Use the
e1 set loopback command to set an E1 line in a loopback mode on the
E3 interface.
Use the
undo e1 set loopback command to restore the default.
By default, loopback is disabled on E1 lines.
If an E1 line encapsulated with PPP is in loopback mode, it is normal that the state
of the link layer protocol is reported down.
Example # Set the first E1 line on interface E3 2/0 in internal loopback mode.
<Sysname> system-view
[Sysname] controller e3 2/0
[Sysname-E3 2/0] e1 1 set loopback local
e1 shutdown
Syntax e1 line-number shutdown
undo e1 line-number shutdown
View CE3 interface view
Parameter line-number: E1 line number in the range 1 to 16.
Description Use the
e1 shutdown command to shut down an E1 line on the CE3 interface.
Use the
undo e1 shutdown command to restore the default.
