System information

Troubleshooting IBM 10-233
SDLC: Router Cannot Communicate with SDLC Device
Link-layer problem (router is
primary)
Step 1 Use the debug sdlc privileged exec command
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to see whether the
router is sending SNRMs.
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Caution: Because debugging output is assigned high priority in the
CPU process, it can render the system unusable. For this reason, use
debug commands only to troubleshoot specific problems or during
troubleshooting sessions with Cisco technical support staff. Moreover,
it is best to use debug commands during periods of lower network
traffic and fewer users. Debugging during these periods decreases the
likelihood that increased debug command processing overhead will
affect system use.
Step 2 If the router is not sending SNRMs, check the physical layer (see the
preceding problem in this table). If the router is sending SNRMs, the
device should send UAs
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in reply.
Step 3 If the device is not sending UAs, make sure the addresses of the router
and device are correct.
Step 4 If you are using a V.35 connection, make sure that the SCT/SCTE
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setting is correct on the interface. The router should use SCTE if the
router is DCE, and SCT if the router is DTE.
The SCT/SCTE setting might be changed with a jumper
or with the software configuration command dce-terminal-timing
enable, depending on the platform. Some platforms do not allow you to
change this setting.
Possible Problem Solution