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RSVP

RSVP. Basic features: Simplex reservation: one way reservation Receiver oriented: receivers decide what resources to reserved and initiates the reservation Routing independent Policy independent: e.g independent of admission control Soft state: dealing with the changing of group members

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RSVP

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  1. RSVP • Basic features: • Simplex reservation: one way reservation • Receiver oriented: receivers decide what resources to reserved and initiates the reservation • Routing independent • Policy independent: e.g independent of admission control • Soft state: dealing with the changing of group members • Various reservation styles

  2. Operation overview • PATH messages and RESV messages (Figure 2.6) • PATH messages (downstream) • Distribute traffic source information • Collect path information • Install necessary state • RESV messages (upstream) • Follow the reserved path of PATH messages • Specify the resource requirements • Setup state in the path

  3. RSVP messages • Sent between hops as raw IP datagrams (prototype Id 46) • Can be encapsulated in UDP packets (used in end systems) • These packets need special treatment: Use Router Alert • Refresh periodically • PATH message: • Previous Hop • Sender Template • TSpec • Adspec (optional, OPWA) collect path information.

  4. RSVP messages • RESV messages • Reservation style • Flow spec and filter Spec (Flow descriptor) • Flow spec: Desired QoS and parameters for packet scheduling depending on the service requested • Service Class • RSpec • TSpec • Filter Spec (sender template) + session specification defines the flow

  5. RSVP messages • Message format: common header (Figure 2.7) + RSVP objects (Figure 2.8) • Reservation Styles: • Wild-card-filter (WF) style: WF(*, {Q}) • Fixed-filter (FF) style: FF(S1(Q1), S2(Q2), …, Sn(Qn)) • Shared explicit (SE) style: SE((s1, s2, …, sn){Qn}) • Example: Figure 2.10-2.12

  6. Adspec • Pass the path information for the destination • Three components: a default general parameters fragment, a guaranteed service fragment, and a controlled load service freament • Default general parameters: • Minimum latency • Path bandwidth • IntServ hop count • Global break bit • Path MTU

  7. Adspec • Guaranteed service fragment • Ctot, Dtot, Csum, Dsum • Controlled load service fragment: • Controlled load service break bit and options • How to compute RSpec for guaranteed service? • Required bandwidth • Slack Term • RFC 2205, 2208, 2209, 2210

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