Hello Vimal
Latency and bandwidth issues can be among the most difficult to troubleshoot. Some things that you can do to try to pinpoint this lantency include:
- Verify latency and the path that is being taken by packets experiencing the delay using tools such as traceroute
- Examine the interfaces of the network devices through which the particular latency has been identified using the
show interfacecommand. Look for queues being overflowed, errors, dropped frames or any other anomaly. - Examine the routers through which packets are being routed and verify that CPU usage is low and that QoS mechanisms are functioning correctly. Verify that no policing or shaping is causing latency.
- Use network monitoring tools to examine the flow of traffic through your network in order to identify potential bottlenecks.
This is just a start, but I hope it helps you on your way.
Laz