QoS for TelePresence/Packet Sequence Preservation?

Hello Experts,
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Not for CCIE exam... but a general query...
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Got following requirements from Cisco to implement TP QoS (PE node)... all seems fine.. but what's "Packet sequence preservation" (PSP)B with respect to QoS.. Could anyone please clarify? It's also mentioned under SLA attributes as per-flow packet seq preservation
http://211.79.59.247/Course/QoS20071122/slide/Day1-02-EndToEndQoSOverview.pdf
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CouldB anyone shed some light on this please... thanksB in advaceB
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Cheers,
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CCIE League
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The PE node provides key functionality for effective delivery of
TelePresence connections
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The features to be enabled include:t
treated appropriately across the network
B A class of service queue designed to ensure TelePresence traffic ist Quality of Service features includingtB B B Policed high priority queuet B B B Assured forwarding queuet B B B Packet sequence preservation <<<<<t B B B Marking for TelePresence bearer traffic must be CS4t B B B Marking for TelePresence signaling traffic must be CS3 or 5t B B B
B B B that is destined for a strict priority queue.Ingress and Egress policers must be enabled on the real time traffict
not exceed the contracted bandwidth at the egress PEB B B A policer must be added to ensure that the strict-priority traffic doest B B B
single aggregate backbone class.PE router must have capability to map several edge classes into at
interface to be no more than one-third of the link capacity.B B B Must limit the amount of strict priority queuing configured on a PE-CEtB B B
transparencyMust be able to demonstrate that the MPLS VPN service includes QoSt B B B
interface to be no more than one-third of the link capacity
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B Must limit the amount of strict priority queuing configured on a PE-CE

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Received on Tue Aug 25 2009 - 10:41:05 ART