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BAR Two Stage Service Reservation

BAR Two Stage Service Reservation. SR Stage SA Stage Linking a SA to a SR Issues. BAR SR Stage. SR Request Flow. HLM asks BAR for a SR BAR asks NSAP if a SR is possible NSAP answers yes or no. If NSAP says yes BAR asks the local and remote L-NSAP to create SR.

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BAR Two Stage Service Reservation

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  1. BAR Two Stage Service Reservation • SR Stage • SA Stage • Linking a SA to a SR • Issues

  2. BAR SR Stage

  3. SR Request Flow • HLM asks BAR for a SR • BAR asks NSAP if a SR is possible • NSAP answers yes or no. • If NSAP says yes BAR asks the local and remote L-NSAP to create SR. • If both L-NSAP say yes then the reservation is successful. • If any L-NSAP says no then cancel NSAP SR and cancel any L-NSAP SR.

  4. BAR SA Stage

  5. SA Request Flow • HLM asks BAR for SA. • BAR asks local and remote L-NSAP if SA is possible • If both local and remote L-NSAP say “yes” then the SA is successful. • If one L-NSAP says “no” then cancel other L-NSAP SA.

  6. Linking a SA to a SR • Using a SR-ID (Explicit linking of a SA to a SR) • Provides a usability issue for clients of BAR (HLM) since “actor” for a SR is likely to be different from “actor” for SA. • Using addresses of source/destination IP subnets (Implicit linking of a SA to a SR) • No usability issue for client of BAR.

  7. Issues • It is possible last mile to be over booked. What stage should we do summing of aggregation – SR or SA ? • E.g. if SR/SA to be done between Sites. A<->B and A<->C, then a common last mile is used between SR/SA. • In SR interface, • Should we distinguish between service types? • If we do not distinguish between the service types then what values do we use for metrics like, packet loss? (for future) • If we do distinguish between service types then what do we specify in SR for GDFT. In this case SR and SA have to be the same type • What is the proper general solution?

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