Chapter 10
| Interface Commands
Cable Diagnostics
– 387 –
Cable Diagnostics
test loop internal This command performs an internal loop back test on the specified port.
Syntax
test loop internal interface interface
interface
ethernet unit/port
unit - Unit identifier. (Range: 1)
port - Port number. (Range: 1-32/54)
Command Mode
Privileged Exec
Command Usage
◆ Loopback testing can only be performed on a port that is not linked up. The
internal loopback makes it possible to check that an interface is working
properly without having to make any network connections.
◆ When performing an internal loopback test, packets from the specified
interface are looped back into its internal PHY. Outgoing data is looped back to
the receiver without actually being transmitted.
Example
Console#test loop internal interface ethernet 1/1
Internal loopback test: succeeded
Console#
show loop internal This command shows the results of a loop back test.
Syntax
show loop internal interface [interface]
interface
ethernet unit/port
unit - Stack unit. (Range: 1)
port - Port number. (Range: 1-32/54)
Command Mode
Privileged Exec
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