Performance of Hierarchical Aggregation in Differentiated Services Networks
We address the use of hierarchical aggregation in DiffServ networks. We propose two analytical models to study the tradeoffs between signaling load and resource utilization. In the case of the signaling load, we introduce a novel performance metric that captures, simultaneously, the state information stored and the rate of signaling messages processed at routers. In the first analytical model, based on multidimensional birth–death processes, the offered load is detailed at the flow level, which allows accurate assessment of the signaling load. The second analytical model accommodates time-varying offered loads, which allows studying the tradeoffs between the time-scale of the aggregate demand and the time-scale of signaling. Our results, which also include analysis using measured traces, show that hierarchical aggregation can introduce very high signaling gains with a small penalty in terms of resource utilization, allowing significant savings in terms of network cost.
KeywordsResource Utilization Accurate Assessment Service Network Signaling Gain Aggregate Demand
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- D. Awduche et al., RSVP-TE: extensions to RSVP for LSP tunnels, IETF RFC 3209 (December 2001).Google Scholar
- F. Baker el al., Aggregation of RSVP for IPv4 and IPv6 reservations, IETF RFC 3175 (September 2001).Google Scholar
- R. Braden et al., Integrated services in the Internet architecture: An overview, IETF RFC 1633 (June 1994).Google Scholar
- H. Fu and E. Knightly, Aggregation and scalable QoS: A performance study, in: Proc. of IWQoS' 01, June 2001.Google Scholar
- Internet Page of NLANR, http://moat.nlanr.net/Traces/Kiwitraces/auck2.html.Google Scholar
- Internet Page of Qbone, http://tombstone.oar.net/sitemap.html.Google Scholar
- P. Pan et al., BGRP: A tree-based aggregation protocol for inter-domain reservations, Journal of Communications and Networks 2(2) (2000) 157–167.Google Scholar
- K. Ross, Multiservice Loss Models for Broadband Telecommunication Networks (Springer, 1995).Google Scholar
- S. Sargento and R. Valadas, Aggregation performance in hierarchical domains, University of Aveiro Technical Report (May 2002).Google Scholar
- S. Sargento et al., IP-based access networks for broadband multimedia services, IEEE Communications Magazine 41, Special Issue on Broadband Access (February 2003) 109–119.Google Scholar
- O. Schelén and S. Pink, Aggregation resource reservations over multiple routing domains, in: Proceedings of IWQoS' 98, Napa, CA, May 1998.Google Scholar