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This indicates that the physical connectivity to this port is
working, and all the expected EIA signals are present. The port is,
however, showing that the line protocol is down. This is due to
either clocking problems or mismatched encapsulation. To resolve
this, we issue the show
controllers
serial
0 command on both router 2 and 3, and
check that the router configuring its Serial 0 port as a DCE has the
clockrate
64000 entry in its
configuration. By changing the polarity of the DTE/DCE cable, we
match the DCE port with the "clockrate 64000"-configured serial port and resolve the problem
caused by change 2. |
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