Hi John,

The tx-ring-limit command sets the size of the hardware transmit queue of the interface which is always a FIFO queue.

The hold-queue command sets the size of the software queue (number of packets).

Based on your description of the problem I have a supposition that your serial interface is continuously overloaded with traffic during the workday.

If this is the situation, playing with the queue size will not bring a fundamental solution.

The reason is that the bandwidth of the interface is probably not enough to handle the traffic that is sent from one router to the other through the frame-relay cloud.

Probably you would need to investigate the possibility of increasing the bandwidth of the frame-relay pvc you are using.

QoS tools are effective only when there are bursts and troughs in the traffic.

Then QoS can buffer certain packets for later service and forward those packets that have higher priority.

In your case the higher buffer space will be filled in very shortly and the packet drops will continue.

Cheers:

Istvan