A Cisco router actually does a loopback by default every 10 seconds on
Ethernet and Fast Ethernet interfaces. Cisco calls it a keepalive, but it's
the same as the old-fashioned loopback frame.
There's no command to start a loopback test, though. It's an interface
configuration command.
Priscilla
At 01:25 AM 3/19/01, zd z wrote:
>Is there any one knows how to do the
>loopback test on ethernet or fastethernet port ?
>
>
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