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Chapter 3 Troubleshooting
3-12
Cisco 1700 Router Hardware Installation Guide
78-5405-03
ISDN S/T
or
ISDN U
Card cannot
make a
connection to the
remote router.
Use show isdn status
command to check the
following:
• Does the current ISDN
switch type match actual
switch type being used?
•Use the isdn switch-type command to
configure correct switch type.
• Is Layer 1 status
deactivated?
•Use the show controller bri0 command
to check for the messages CO
RUNNING LOOPBACK TESTS or CO
TESTING. If you receive these
messages, contact the service provider.
• If Layer 1 status is active,
does Layer 3 status say “2
Active Layer 3 calls”?
• Router might have called itself. Check
destination phone number configured
with the dialer map command or the
dialer string command.
• If Layer 1 status is active,
does Layer 3 status say
“No Active Layer 3
call(s)”?
• Check destination phone number and
make sure it matches the remote router
phone number. Check route to the
destination and make sure it matches
the remote router network address.
• If Layer 1 status is active,
does Layer 3 status say “1
Active Layer 3 call”?
• Check router protocol configurations.
Table 3-4 Troubleshooting ISDN (Continued)
WAN Interface
Card Symptom(s) Check the Following Possible Causes