Calculating virtual circuit oversubscription
Virtual circuits are oversubscribed when the sum of the virtual circuitlogical definitions that partition a a physical network circuit and used to determine what traffic passes through it and how much bandwidths exceeds the bandwidth of the parent circuit. For example:
Circuit Bandwidth = 3Mbps
- Virtual Circuit Bandwidth A = 2Mbps
- Virtual Circuit Bandwidth B = 1Mbps
- Virtual Circuit Bandwidth C = 1Mbps
This means, the sum of the three virtual circuits is 4Mpbs, but the circuit bandwidth is only 3Mbps.
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VC A: automatic VC B: automatic VC C: automatic |
Each VC gets: desired bandwith / sum of VC bandwith * circuit bandwidth
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VC A: manual = 2 Mbps VC B: manual = 0.5 Mbps VC C: manual = 0.5 Mbps |
Each virtual circuit with manually set oversubscription bandwidth will get their guaranteed amount
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VC A: automatic VC B: automatic VC C: manual = 0.75 Mbps |
Each virtual circuit with manually set oversubscription bandwidth will get their guaranteed amount. Virtual circuits with automatic oversubscription calculations will share the remaining bandwidth as: virtual circuit's desired bandwidth / total remaining bandwidth * (circuit's bandwidth - sum of manually specified oversubscription bandwidths)
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