260CHAPTER 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-numberset loopback { local payload remote }

undo e1 line-numberset 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-numbershutdown

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.

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3Com MSR 30, MSR 50 manual E1 set loopback, E1 shutdown, Undo e1 line-numbershutdown