Load balancing by MPLS in differentiated services networks
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1 Load baacg by MPLS dfferetated servces etworks Rkka Sustava Supervsor: Professor Jora Vrtao Istructors: Ph.D. Prkko Kuusea Ph.D. Sau Aato Networkg Laboratory Thess Sear o Networkg Techoogy 1
2 Cotets Backgroud Obectves Load baacg agorths Routg agorths to acheve dfferetated servces Resuts Cocuso Thess Sear o Networkg Techoogy 2
3 Backgroud 1/3 Curret IP routg s topoogy drve Routers ake forwardg decsos depedety Paths seected usg shortest path agorths Mut Protoco Labe Swtchg MPLS cobes datagra ad vrtua crcut approaches based o short abes that are used to ake forwardg decso Thess Sear o Networkg Techoogy 3
4 Backgroud 2/ Thess Sear o Networkg Techoogy 4
5 Backgroud 3/3 The ost sgfcat appcato s traffc egeerg Provde capabtes to spt traffc Load baacg ethods MPLS provdes toos for oad baacg Obectve to ze the axu k oad ze the ea deay Grauarty Thess Sear o Networkg Techoogy 5
6 Obectves of thess To study MPLS archtecture Techca aspect Traffc egeerg over MPLS To study oad baacg agorths Approxatos Grauarty To deveop fow aocato ethods that provde dfferetated servces Thess Sear o Networkg Techoogy 6
7 Load baacg agorths The obectve s to ze the ea deay Based o the deay of M/M/1-queue 3 dfferet ethods peeted ad copared Notato: Drected k wth badwdth b Traffc dead d where s gress ode ad egress ode R k =d f k s egress ode R k =-d f k s gress ode otherwse R k =0 x traffc of gress-egress par o k Thess Sear o Networkg Techoogy 7
8 Thess Sear o Networkg Techoogy 8 1. Mu-deay routg. to sub. 1 M. R Ax b x x b x C = < Λ =
9 Thess Sear o Networkg Techoogy 9 2. LP-NLP optzato 1 st phase -ax optzato: 2 d phase: Aocate traffc to the paths obtaed fro 1 st phase souto so that the ea deay s zed. 0. to sub. M. > = < + + Z R Ax b Z b x x ez
10 3. Heurstcs: Dvde traffc to streas accordg to the eve of grauarty. Route each strea to the etwork usg Dkstra s agorth ascedg order ters of traffc testy descedg order ters of traffc testy descedg order ters of the ea deay. Use the deay of M/M/1/queue as cost of each k Thess Sear o Networkg Techoogy 10
11 Routg agorths to acheve dfferetated servce The goa s to dfferetate the ea deay of dfferet casses god ad sver two approaches: Optzato that rees o routg oy Optzato that uses WFQ-weghts to acheve dfferece Weghted Far Queueg WFQ provdes desred porto of badwdth to each servce cass Approxatos Thess Sear o Networkg Techoogy 11
12 Thess Sear o Networkg Techoogy 12 The weghts optzato fucto. to sub. ] [ M. 1 R Ax b x x b x w D w E = < Λ =
13 2. Optzato so that the rato of ea deay s fxed to a paraeter q. M sub. to E [ D E E [ D [ D ] ] ] = q. 3. Heurstc approach: The cass that shoud acheve saer ea deay s routed frst usg the heurstc agorth descrbed above. Aocated traffc of frst cass s utped by a factor of 1+ ad secod cass s routed Thess Sear o Networkg Techoogy 13
14 Thess Sear o Networkg Techoogy 14 Optzato usg WFQ-weghts 1. The weghts cuded to the optzato fucto. 1 to sub. ] [ M. R Ax g b g x x b g x w D w E = = < Λ =
15 Ateratve ways to optze: Straghtforward optzato Two-eve procedure: traffc s frst aocated wthout WFQ-weghts ad the WFQ-weghts are defed usg optzato fucto above. Two-eve procedure so that paths are frst defed usg LP-foruato ad the the WFQ-paraeters are defed usg optzato fucto above. 2. The rato of the deays at each k s fxed to a paraeter q ad WFQ-weghts defed as fucto of q Thess Sear o Networkg Techoogy 15
16 Resuts 1/5 Test-etwork: 10 odes 52 ks 72 gress-egress pars 2 casses god ad sver Equa traffc atrces Thess Sear o Networkg Techoogy 16
17 Resuts 2/5 The ea deay as the fucto of grauarty The ea dea y Grauarty Thess Sear o Networkg Techoogy 17
18 Resuts 3/5 Theeadeay as thefucto of thepercetageof axuoad T he ea dea y Mu- deay LP-NLP Heurstcs Loadas %of axu Thess Sear o Networkg Techoogy 18
19 Resuts 4/ Theeadeayas thefuctoof theratoof eadeay The ea dea y Weghts Fxed Heurstcs Theratoofeadeay Thess Sear o Networkg Techoogy 19
20 Resuts 5/5 The ea deayas thefucto of therato of ea deay The ea dea y Theratoof eadeay Straghtforward Two-step verso1 Two-step verso2 Two-step teratve LP-NLP Fxeddeays vers. 1 Fxeddeays vers Thess Sear o Networkg Techoogy 20
21 Cocusos The use of oad baacg proves perforace sgfcaty LP-NLP agorth reduces the coputato te The weghts used optzato wth WFQweghts are saer tha optzato wthout WFQ-weghts Icrease ea deay s greater optzato wth WFQ-weghts The agorth that aocates frst traffc ad the deteres WFQ-weghts s cosest to opta Thess Sear o Networkg Techoogy 21
22 Further work More optzato varatos of Topoogy ad sze of etwork The uber of traffc casses Uequa traffc dead atrces betwee casses Modeg the actua badwdth provded by WFQ-schedug Thess Sear o Networkg Techoogy 22
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