| Author: | Fugui Wang |
| Advisor: | Prasant Mohapatra |
| Email: | wangfugu@cse.msu.edu; http://www.cps.msu.edu/~peggas79 |
The differentiated services (DiffServ) model, proposed to convert the current best-effort Internet to a quality-of-service-aware Internet, provides packet level service differentiation on a per hop basis. The end-to-end service differentiation may be provided by extending the per hop behavior over multiple network domains through service level agreements between domains. The edge routers of each of the domains monitor the aggregate flow of the incoming packets and demote packets when the aggregate incoming traffic exceeds the negotiated interdomain service agreement. A demoted packet may encounter other edge routers on its path that have sufficient resources to route the packet with its original marking. We have proposed a Random Early Demotion and Promotion (REDP) Marker that works at the aggregate traffic level and allows (1) fair demotion of packets belonging to different flows, and (2) easy and fair detection and promotion of the demoted packets. Using early and random decisions on packets REDP ensures fairness in promotion and demotion. It uses a three color marking mechanism, reserving one color for differentiating between a demoted packet and a packet with the original out-of-profile marking. Using the REDP marker, assured service flows achieve better assurance of bandwidth.
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