Research Article
Towards Internet QoS Provisioning Based on Generic Distributed QoS Adaptive Routing Engine
Table 1
A comparison between OQRA and PQRA.
| Point of view | OQRA | PQRA |
| Computation | Every time a request initiated. | Precomputes paths from a source to all destinations. |
| Scalability | Limited. | Large-scale networks. |
| Suitability | When requests arise infrequently. | When requests arise very frequent. |
| Pros | Optimal routing during congestion state. | (i) Saves time. (ii) Better scalability. (iii) Improved load balancing. |
| Cons | Puts excessive time on packet processing. | (i) Path oscillation. (ii) Nonoptimal routing during congestion. (iii) Resources consumption. (iv) Complexity. |
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