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1 QoS Intserv diffserv Internet Week 98 Internet Week Kenjiro Cho, Japan Network Information Center

2

3 1 3 QoS Intserv RSVP QoS Diff-serv 2 QoS ISP 3

4 2.1 FAX LAN WAN LAN WAN Heavy Tail WWW Heavy Tail 2.2 ARPANET N = T N : T:

5 6 7 WWW

6 2.3 Long Term Day Session ( ) Round Trip Time Packet Time 2.4 QoS Best Effort Best Effort Best Effort QoSQuarity of ServicesQoS ISP

7 QoS IETF Int-serv QoSQuarity of Service Mbps ms QoS Class of ServiceCoS Diff-serv QoS QoS CPU 2.5 QoS QoS LAN WAN QoS Over-provisioning QoS QoS Over-provisioning QoS Over-provisioning

8 2.6 QoS QoS admintion contorol RSVP signaling classifier IP TOSType of Service (packet scheduler) (shaper)

9 Priority Queueing priority Weighted Fair QueueingWFQ WFQ WFQ Parekh WFQ

10 Parekh WFQ QoS Class-Based QueueingCBQ estimator

11 CBQ

12 2.8 Drop-Tail Drop-Head Drop-Random Random Early DetectionRED RED TCP RED 50 Min Threshold 5Max Threshold 15mark probablility 10%

13 3 Intserv RSVP QoS IETF 3 Int-serv QoS RSVP Integrated Services over Specific Link LayersISSLL 3.1 Int-serv Int-serv Guaranted Service Controlled Load Services 2 Best Effort Controlled Load Services

14 Token Backet TSpec 3.2 RSVP RSVP IPv4 IPv6 Fixed Filter Shared-ExplicitWildcard-Filter3 RSVP

15 RSVP A/B/B C/D/D RSVP Path Resv Path Path QoS PathTearResvTear PathErrResvErr Confirm DiagReq DiagRep

16 Path Resv S2 Path Path State R1 Resv Resv State

17 R2 Resv Resv State Resv State RSVP 2 RSVP

18 ISI RSVPD RSVP rsvpd rsvpd svpeep rsvptrace 3.3 Integrrated Services over Specific LinkISSLL Int-serv IS802 Ethernet ISATM Int-serv ATM ISSLOW T1

19 3.4 RSVP RSVP State 2 RSVP over MPLS RSVP over diff-serv RSVP 4 Diff-serv Diff-serv 2 Int-serv/RSVP ISP Diff-serv State TOS Classifier ISP Diff-serv 97 8 IETF Int-serv Diff-serv BOF Premium Service ModelV. Jacobson@LBLDrop preference Model D. Clark@MITCisco s CoSF. Baker@Cisco IETF Diff-serv ISP

20 4.1 TOS IP Type of servicetos 8 6 Diffeerentiated services codepoint 2 ECN TOS Diff-serv QoS IPv6 Traffic Class IPv4 v6 Diffserv 4.2 Diff-serv Diff-serv ISP Service Level Agreement TOS

21 classifier meter profile 4.3 Forwarding Behavior Forwarding Behavior ISP ISP Forwarding Behavoir Per Hop BehaviorPHB Diff-serv PHB PHB

22 6 xxxxx0standard PHBs PHB xxx000class Selector PHBs 7 IP Precedence Assured Forwarding PHBs 12 4 Class Selector Expedited Forwarding PHB xxxx11experimental/local Use xxxx01: Experimental/Local Use PHB 3 Default PHB 0 Best Effort Class Selecor PHBw Cisco IP precedence Assured Forwarding PHBs Clark Drop Preference QoS PHB Best Effort 4 3 IETF RFC

23 Expandited Forwarding PHBs Jacobson Premium Priority Queue ATM CBR IETF RFC 4.4 Diff-serv PHB ISP Diff-serv RSVP over Diff-serv Diff-serv RSVP Diff-serv over MPLS Diff-serv ATM 2 ISP

24 5 QoS Int-serv/RSVP QoS Diff-serv QoS 6 IETF IETF Diff-serv IETF Int-Serv IETF ISSLL IETF RSVP RSVP Diff-serv at MIT CBQ ALTQ Quality of Service P. Ferguson and G. Huston. Wiley. ISBN An Engineering Approach to COmputer Networking S. Keshav. Addison-Wesley. ISBN

25 High-speed Networks: TCP/IP and ATM Design Principles William Stallings. Prentice Hall. ISBN Gigabit Networking Craig Partridge. Addison-Wesley. ISBN Queueing Systems vol. 1 and vol. 2 LeonardKleinrock. Wiley-Interscience. ISBN X

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