QUASIMODO: quality of service-aware multicasting over DiffServ and overlay networks

Efficient delivery of real-time multicast traffic imposes on the underlying network infrastructure the burden of supporting quality of service. This can be quite a complex issue in a differentiated services IP network, especially if multicast users are allowed to join and leave the multicast tree dy...

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Bibliographic Details
Published in:IEEE network 2003-01, Vol.17 (1), p.38-45
Main Authors: Bianchi, G., Blefari-Melazzi, N., Bonafede, G., Tintinelli, E.
Format: Article
Language:English
Subjects:
Availability
Diffserv networks
Dynamics
IP (Internet Protocol)
IP networks
Links
Multicast
Multicast protocols
Multicasting
Network operating systems
Networks
Quality of service
Real time
Routing protocols
Telecommunication traffic
Testing
Traffic control
Unicast
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Summary:Efficient delivery of real-time multicast traffic imposes on the underlying network infrastructure the burden of supporting quality of service. This can be quite a complex issue in a differentiated services IP network, especially if multicast users are allowed to join and leave the multicast tree dynamically. In fact, since DiffServ lacks explicit reservation states, a replicating node cannot test whether a corresponding reservation exists on an output link, and upon a dynamic join of a QoS multicast user, the DiffServ network lacks control functions to verify whether resources are available along the new path. We present a solution to support dynamic multicast with QoS over a DiffServ network. Our solution combines two ideas. First, resource availability along a new QoS path is verified via a probe-based approach. Second, QoS is maintained by marking replicated packets with a special DSCP (differentiated service code point) value before forwarding them on the QoS path.
ISSN:0890-8044
1558-156X
DOI:10.1109/MNET.2003.1174176