1 / 7

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

duc
Download Presentation

RSVP

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related