Information Technology Reference
In-Depth Information
Table10-8
SDLC: Router Cannot Communicate with SDLC Device (continued)
Possible Problem
Solution
Link-layer
problem (router is
primary)
(continued)
6.
Try reducing the line speed to 9600 bps using the
clock rate
interface configuration command. Use the
clock rate
interface configuration command to configure the clock rate
for the hardware connections on serial interfaces such as
NIMs
10
and interface processors to an acceptable bit rate.
Syntax:
The following is the syntax of the
clock rate
command:
clock rate
bps
Syntax description:
•
bps
—Desired clock rate in bits per second: 1200, 2400,
4800, 9600, 19200, 38400, 56000, 64000, 72000, 125000,
148000, 250000, 500000, 800000, 1000000, 1300000,
2000000, 4000000, or 8000000
Example:
The following example sets the clock rate on the first serial
interface to 64,000 bits per second:
interface serial 0
clock rate 64000
Make sure that cabling is correct, securely attached, and
undamaged.
7.
Link-layer
problem (router is
secondary)
1.
Use the
debug sdlc
privileged exec command to see whether
the router is receiving SNRMs.
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.
2.
If the router is not receiving SNRMs, check the primary
device. Make sure that the physical layer is operational (see
the problem “Physical layer problem,” earlier in this table).
If the router is receiving SNRMs, it should send UAs in
reply.
3.
If the router is not sending UAs, make sure that the addresses
of the router and device are correct.
4.
If you are using a V.35 connection, make sure that the
SCT/SCTE setting is correct on the interface. The router
should use SCTE if the router is DCE, and should use SCT
if the router is DTE.
