RSVP

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