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Chapter 6. Quality of Service in IPv6 > Mapping IP QoS to Underlying Transmissi...

6.4. Mapping IP QoS to Underlying Transmission Networks

IP is traditionally able to run over almost any network transmission layer. While this approach has a clear advantage in terms of connectivity and interoperability on the network layer, it also means that only common-denominator functionality is required from the transmission layer. Even if the underlying transmission protocols offer advanced services, such as fragmenting or reassembly of packets and QoS-handling capabilities, IP standardization has a tendency to be self-sustained and either ignores these capabilities or redesigns them within the network or transport layer.

Along these lines, IP QoS elements have been designed as standalone mechanisms. Any mapping onto lower-layer QoS elements, such as ATM traffic classes or Multi-Protocol Label Switching (MPLS) traffic engineering attributes, are either not foreseen or are in the early stages of design and implementation (often driven by interested vendors).


  

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