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Title:

QoS

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QoS * RSVP (Resource ReSerVation Protocol ... – PowerPoint PPT presentation

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Transcript and Presenter's Notes

Title: QoS


1
???????? ????????????
  • QoS

2
???? ??????????
  • ????????????????? (elastic)
  • ??????? ???????? ??????? ????????? ??????
    ???????, ????, ???????, ??? ?????? ??? ?????
  • ?????? FTP, torrent, HTTP, email
  • ????????? ??????????
  • ?????? ?????? ????? ????????????? ? ??????????
    ????????
  • ????? ?????????????? ? ????????? ????????? /
    ????????? ??????? ??????? / ??????? ???????,
    ????????, ????? ???????? ????????????? ?????
    ???????
  • ?????????? ????????? ???????
  • ?? ????? ?????????????? ? ????????? ?????? ??????
    / ??????? ??????? / ??????? ???????
  • ?????? IP-?????????, ??????? ????????????????????
    ? ????, ?????????? ??? ?????????? ???-???? ?
    ???????? ???????

3
???????? ???????? ???????????? (QoS)
  • ???????? ?????? ?????????? ?? ???????? best
    effort - ????????? ???????? ???????? ?????????
    ????????????
  • IETF ???????? ??? ???????????, ????????????????
    ???????? ???????? ???????? ??????????
  • IntServ, RSVP
  • DiffServ
  • ?????? ??? ??????? ??????? ??? ??????????
    ????????????? ??????

4
???????? QoS
  • ?????????? ?????????? IP-????????? (1Mbps) ?
    uTorrent, ????????? ???????????? ????? 1.5 Mbps
  • ??????? ????? ????? ????????? ?????????????
    ????????? ?????-??????
  • ??? ??????? ???????????? VoIP ????????? ???
    uTorrent
  • ??????? 1 ????? ?????? ?????? ??????? ? ???????
    ????????????? ????????? ???????????? ??????
    ??????

5
???????? QoS
  • ???????????? VoIP-?????????? ????? ??????????
    ??????? ??? ???? ???? ?????
  • ??????? 2 ?????? ?? ?????? ??????? ???? ?????,
    ???????? ?????????? ??????????? ?????? ???????
    ???? ????????
  • ??????? ??????? ??? ??????? ???? ???????
    ??????????????? ?????????? ????? ??????
    ???????? ?????????????

6
???????? QoS
  • ??????? 3 ??????????? ???????? ??????? ???????,
    ????? ???????????? ?? ??????????? ?????????????
    ??????
  • ????? ???????????? ??????? ??????? ? ????????
    ?????????????? (Weighted fair queuing, WFQ)

7
???????? QoS
  • ???????? ? ?????? ???? ??????????? ?????? ??????
    ??? ??????? ???? ??????? ????? ?????????
    ?????????????
  • ??????? 4 ????? ????????? ???????? ???????
    ??????????? ???????? ?????????? ??????????? ????
    ? ??????? ??????????? ?????????? ??????????? /
    ?????????? / ??????? ???????, ???? - ????????

8
?????
???????? ????????????
  1. ?????????? ??????? ???????
  2. ???????? ???????
  3. ??????????? ????????????? ??????
  4. ???????? ??????????? ?????????? ??????????

9
??????? ???????? ???????? ? Internet
  • ???????????? 80? ?????? 90? ????? ???????? ??
    ?????????? ???????
  • ?? ?????? ????? ???? ??????????? ????????? QoS ?
    ????? ATM ? IntServ.???????????
  • ??????? ???????? ???????? ?????????? ?? ??????
    ???? ?? ???????
  • ??????????????? ??? ?????????????? ???? ?????????
    ?????????? ? ?????????? ????????? ???????
  • ? ????????? ???? ???????????? ?????????
    Differentiated services
  • DiffServ ???????? ?? ????????? ?? ?????????
    ???????, ? ?????????????? ??????? ???????

10
IntServ
  • ?????????? ??????? ?????? ????????? ???????
    ??????? ? ???????? ????????? ?????????????
    ???????
  • R-spec ?????????? ????? ???????????? 'best
    effort, ???????????? ? ?????????????? ?????????
    ??? ??????????????? ????????????
  • T-spec ?????????? ????????? ????????? ????????
    ????? ??? ??????? (???????? ?????? r ? ??????
    ??????? b).

11
Token bucket
12
???????? RSVP
  • RSVP ???????? ?????????????? ??????? ????????
    (Resource ReSerVation Protocol) ?????? ???
    ???????? R-spec ? T-spec ?? ???????
    ???????????????
  • ????-???????? ????? ????????? ?????? ???????? ??
    ???? ?????????, ????????????? ???????????? ??????
    ??????????? ? ????? ????????????
  • ?????????????? ????????????? ???, ?????
    ?????????? ?????? ?????? ???????????????
    ????????? ?????????? ???????????

13
Differentiated Services (DiffServ)
  • ?????????? ??? ??????????? ????????? ???????????
    IntServ ? RSVP
  • ???????????????? ? ??????? ????? ??????????
    ??????? ?????????? ????????? ?????
    ?????????????? ?? ???????????
  • ?????????????? ????? ??????? ????????????
    Intserv ???????????? ???? 3 ?????? ????????
    ????????? ????????????? ????
  • ??????? ??????? ?????????????? ???????? ??????
    ??????????? ? ????????????? ????????? ????
    ??????? ??? ???????????? ?????? ?????? ?????
    ????? ??????? ????????? ?? ??????????????
    ??????????

14
Differentiated Services (DiffServ)
  • ???? ????? ???????? ?????????? ?????????????
    ????????? ? ??????? ? ?????? ????????? ????????
    ????????????
  • DiffServ ???????? ?? ????????? ?????????????
    ??????? ? ?????????? ?? ????????? ?????
    ???????????? ???????
  • ? ??????? ?? RSVP, ? ?????? DiffServ ???????????
    ? ?????????? ?? ???????????? ??????????? ?
    ??????????? ? ???????? ????????????

15
??????????? DiffServ
  • ?????????? ?? ?????? ??????? (Service Level
    Agreement, SLA) ????????????? ??????? ???????
    ?????????????? ???????? ??????? ???????? ?
    ???????? ??? ?????? (?????? ???????????????
    ??????????)
  • ??????????? ?????????????? ????????? ??????????
    ???????
  • ?????????? ?????????????? ???????????? ?????? ?
    ???????????? ? ???????????? ?? ????????? (???????
    ????????? ????????? Per-Hop Behavior, PHB)

16
?????????? ???????
  • DSCP DiffServ Code Point
  • ?????? ??????????? ? IP-????????? ? ???? Type of
    Service ? IPv4
  • 6 ???, 2 ???????????????. ????? 16 ???????

17
?????????? ???????
18
?????????
Best-Effort
Diffserv
Intserv
  • ?????????????? ???????? ??????? ???????
  • ???????? ??? ??????? ???????
  • ????? ???? ?????
  • ??? ???????? ???????
  • ??? ????????

???????????
  • ???????? ???????
  • ???????? ??? ??????? ??????

???????????
  • ???????? ?? ???? ????? ? ???????
  • ???????? ? ??????
  • ???????? ?? ???? ????? ? ???????
  • ????????? ??? ??????? ????? ?? ???????????
  • ????????? ?????????? ???????

?????????
  • ??? ????????

????????- ????????
  • ??????? ????????????????(???? ???????? ?????? ?
    ?????????? ???????????)
  • ?? ???????????? (?????? ????????????? ??????
    ?????????? ? ?????? ??????)
  • ???????????? (????????? ???? ?????? ?????????? ?
    ??????????, ?????????? ? ??????????? ???????)

19
???????? ???????
  • ??????? ? ????????? ????? ?????? ??????
    ????????????? ????????? ????? ???????
  • ??????? ???????????? ????? ?????????????????
    ???????? CS Cisco ? AF (DSCP)
  • ???????? ??? ?????????? ??????? ?????? ? Linux
    https//habrahabr.ru/post/133076/

20
???? ???????? ????????
  • Content Delivery Networks

21
????????????? CDN
  • ?? ??????? ?????????
  • ???? ?????? ??????????
  • ?????????? ????
  • ?? ???? ???????????? ??????????
  • ??????????? ?????, ??????????? ? ??????
  • ??????????? ????? ? ????? ??????
  • ??????????? ???????????? HTML

22
??????
  • ?????????????? ???????? ?????? (?????? ??
    ????????)
  • ????????????? ? ?????????? ???????
  • ???????? ??????
  • ??????? ?????????? (??? ??????????? ?????)

23
?????????????? ???????? ??????
  • ??????????? ???????????, ??????,
    javascript-??????????
  • ??????? ? ????????? ??????? ? ????????????
  • ??? ????????? ????????????? ?? ???? ???????? ????
  • ??????????? ???????????? ?? ???????? ???????
  • ??????????? ???????????? ???????? ????????? ?
    ??????????????? ?????????

24
????????????? ? ????????
  • IP-anycast, IP-multicast
  • DNS-selection
  • Map-based
  • Racing-based
  • HTTP redirection
  • Transparent interception (Cisco)
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