Comet Labs IPTEL-S Manual de usuario descargar pdf (Pagina 47)

QoS Protocols

8/31/2005 Copyright - Ahlgren 2005 47

AhlTek

 RSVP – Resource Reservation Protocol

 Request priority service from each router on the path

 Tries to emulate a traditional ‘circuit’

 Provides high level service and feed back to the QoS application

 ‘Circuit’ is built and torn down for each connection

 DiffServ – Differentiated Services

 Two service level or traffic classes per hop

 Expedited Forwarding – highest quality but drop excess traffic

 Assured Forwarding - excess traffic is delayed

 Marks traffic at ingress and un-marks at egress points

 Use values in the DS byte (TOS)

 Effective method for aggregating CBR streams into fixed pipes

 MPLS – Multi-protocol Label Switching

 Similar to DiffServ, prepares/reserves the network for QoS

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Comet Labs IPTEL-S Manual de usuario Pagina 47