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I have bit of ambiguity running in my mind. The command srr-queue bandwidth share 1 30 35 5 will inform the particular interface to transmit data in the ratio specified. Correct, although enabling PQ takes the 1st value out of the computation. How is these ratios determined. Is there any formula? Do you mean how your 3750 uses the values or what they ought to be? The former is they are ratios, the latter depends on what you're trying to accomplish. You might set the ratios so certain queues are guaranteed a minimum amount of bandwidth that the traffic in that queue requires. For example, if you had a HD video stream that required 10 Mbps, on a 100 Mbps interface, you would insure its ratio provices it at least 10% of the bandwidth. Of if you had only defualt and scavenger traffic, you migth set the ratio 255:1. Effectively default would almost obtain PQ treatment vs. scavenger, but unlike PQ, scavenger couldn't be totally starved.
And wat does the order of weights/ratios signify. The settings for each of your four egress queues, starting with Q1. And if there are multiple queue with one of the queue as high priority traffic how will they get transmitted according to the ratio. Q1 is ignored for bandwidth proportions of the remaining queues. Their ratios will apply to bandwidth not used by Q1.
Eg. High Priority will follow 1. then next high priority 30 and so on?
and how is dis queue formed? How do we implement this priority level
I'm not sure what you're asking. If PQ is enabled, Q1 packets, if any queued, are trasmitted until Q1 is empty. PQ can use all 100% of bandwidth and starve other queues from obtaining any bandwidth. For any bandwidth not being used by PQ, your 3 remaining queue would share bandwidth 30:35:5 (or 6:7:1 or 42.9% [6/14] to 50% to 7.1%). If any queue or queues don't use all their bandwidth, what's not used is available to the other queues in their ratios. For example, if Q2 had no traffic, then Q3 and Q4 share 35:5 (or 7:1 or 87.5% [7/8] to 12.5%).
