A Policy Based QoS Management System for the IntServ/DiffServ Based Internet
نویسندگان
چکیده
Policy based management is being adopted widely for different domains like QoS, security and VPNs in order to allow new services and facilitate network management. Also, the interface to the network device and the information models required for specifying policies are either standardized or being standardized in IETF and DMTF. This paper reports the design, implementation, and performance evaluation of a policy based QoS management system for the IntServ/DiffServ based internet which is based on COPS for interfacing with the network device and on LDAP directory for storing policies. The design is based on distributed components and CORBA is used as a middleware for component interaction. The Diffserv policies are installed based on role combination assigned to the network device interfaces and policy caching is used to improve the performance. The feasibility and performance of managing and deploying IntServ and Diffserv policies for QoS management is demonstrated using Linux-based routers. The preliminary performance measurements show that the policy server response time is around 90ms for 25 COPS-RSVP requests per second. COPS-PR processing takes more time compared to COPS-RSVP requests. It is found that the directory access could become a bottleneck in scaling the performance of the policy server and it can be improved substantially by employing appropriate policy caching mechanisms.
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