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How Exinda Handles Oversubscription in a Virtual Circuit

Overview

This article will provide you with information on how to calculate virtual oversubscription.

 

 

Information

Virtual circuits are oversubscribed when the sum of the virtual circuit 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.

 

VC Configuration

Information

VC A: automatic

VC B: automatic

VC C: automatic

Each VC gets:

desired bandwidth / sum of VC bandwidth * circuit bandwidth

  • VC A = 2/4 * 3 = 1.5 Mbps
  • VC B = 1/4 * 3 = 0.75 Mbps
  • VC C = 1/4 * 3 = 0.75 Mbps

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

  • VC A = 2 Mbps
  • VC B = 0.5 Mbps
  • VC C = 0.5 Mbps

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)

  • VC C = 0.75 Mbps
  • VC A = 2/3 * (3 - 0.75) = 1.5 Mbps
  • VC C = 1/3 * (3 - 0.75) = 0.75 Mbps

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  1. Priyanka Bhotika

  2. Posted
  3. Updated

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