Information Technology Reference
In-Depth Information
Table 10-5 outlines the problems that might cause this symptom and describes solutions to those
problems.
Table10-5
RSRB: Periodic Communication Failures
Possible Problem
Solution
Misconfigured T1
timers
If you are not using local acknowledgment, misconfigured T1
timers can cause periodic timeouts.
Use a network analyzer to see how long it takes for packets
to travel from one end of the network to the other. (Note:
Inserting a network analyzer to a T1 circuit will bring the
circuit down.)
1.
Use a
ping
test to the remote router, and note the round-trip
delay. Compare this value with the configured T1 timer
values on end systems.
2.
If the round-trip delay is close to or exceeds the T1 timer
value, acknowledgments are probably being delayed or
dropped by the WAN. For delays, increase the T1
configuration on end systems. For drops, check buffers and
interface queues.
3.
Enable local acknowledgment to see whether that solves the
problem.
4.
WAN link
problem
For information on troubleshooting serial line problems, refer to
Chapter 15. For information on troubleshooting different WAN
environments, refer to the appropriate chapter elsewhere in this
topic.
RSRB: NetBIOS Client Cannot Connect to Server
Symptom:
NetBIOS clients cannot connect to NetBIOS servers over a router configured as an RSRB.
