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Cs 552 Computer Networks Quality Of Service
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| bet | 6/12 | | Sana | 26.12.2023 | | Hajmi | 492 Kb. | | #128375 |
Bog'liq qos-f05 - From receiver to sender(s) to reserve resources
- Sent hop-by-hop using PHOP information
- Reservation style and flow description
- Reservation style (FF,SE, WF)
- Fixed-filter, Shared-explicit, wildcard-filter
- Senders to which the reservation applies
- Rspec, QoS specific requirements
- RSpec is highly specific to the service required, and may include information like bandwidth allocation, maximum delay, or packet loss probabilities etc.
- RESV messages processing at each hop
Route Pinning - Problem: asymmetric routes
- You may reserve resources on RS3S5S4S1S, but data travels on SS1S2S3R !
- Solution: use PATH to remember direct path from S to R, i.e., perform route pinning
How Is the Token Bucket Used? - Can be enforced by
- End-hosts (e.g., cable modems)
- Routers (e.g., ingress routers in a Diffserv domain)
- Can be used to characterize the traffic sent by an end-host
Source Traffic Characterization - Arrival curve – maximum amount of bits transmitted during an interval of time Δt
- Use token bucket to bound the arrival curve
- End-host: specify
- the arrival rate characterized by token-bucket with parameters (b,r,R)
- the maximum maximum admissible delay D
- Router: allocate bandwidth ra and buffer space Ba such that
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