tailieunhanh - A new method to implement AFij at core routers in diffserv networks

The most complicated part in DiffServ implementation belongs to AF BHP. Indeed, the complication of AF comes not only from its architecture, but also from its goals. This paper will propose a method to implement AFij of AF BHP at core routers in DiffServ networks. Using this method, we can make AF subclasses (AFij ) easily. Moreover, the performance of the system will be better since the mechanism has congestion control ability and fair sharing between subclasses in an AF class. | ’ Tap ch´ Tin hoc v` Diˆu khiˆ n hoc, , (2007), 71—79 ı e e . . a ` . A NEW METHOD TO IMPLEMENT AFij AT CORE ROUTERS IN DIFFSERV NETWORKS LE HUU LAP1 , VU NHU LAN 2 , NGUYEN HONG SON3 1 Vice Director of PTIT, Hanoi, Vietnam 2 Institute 3 Faculty of Information Technology Hanoi, Vietnam of Information Technology II PTIT Ho Chi Minh city branch, Vietnam Abstract. Nowadays, the DiffServ architecture is considered the most prevalent solution of QoS provision in IP networks. What is the best way to implement this architecture is still a question without answer. The most complicated part in DiffServ implementation belongs to AF BHP . Indeed, the complication of AF comes not only from its architecture, but also from its goals. This paper will propose a method to implement AFij of AF BHP at core routers in DiffServ networks. Using this method, we can make AF subclasses (AFij ) easily. Moreover, the performance of the system will be better since the mechanism has congestion control ability and fair sharing between subclasses in an AF class. ´ ´ ´ ’ ’ ’ a o a T´m t˘t. Hiˆn nay, kiˆn tr´c dich vu kh´c biˆt xem nhu. mˆt giai ph´p dam bao chˆ t o a e e u . a e . . . . . . ’ a o a o a ` e ´ ´ e ´ ´ e ’ ’ o a u e dich vu trˆn mang Internet. C´ch thi tˆt nhˆ t kiˆn tr´c kiˆ u n`y c`n l` mˆt vˆ n dˆ dˆ ngo. e a . . . . . ´ ` ` n ph´.c tap nhˆ t trong viˆc thi dich vu kh´c biˆt thuˆc vˆ AF BHP . T´ ph´.c tap ınh u . a e a e o e Th`nh phˆ a a u . . . . . . . ´ e ´ ´ o ’ ’ a a ` e a cua AF khˆng chı l` vˆ n dˆ kiˆn tr´ c m` c`n l` muc tiˆu cua n´. B`i b´o dˆ xuˆ t mˆt ph´p o u a o a . e ’ o a a ` e a . ’ . ´ ’ ’ ’ . dˆ thi AFij cua AF BHP o. trong l˜i bˆ dinh tuyˆn trong mang dich vu kh´c biˆt. Su. dung e e a e o o . . . . . . ’ ˜ a a a o o a e e e ph´p n`y, ta c´ thˆ chia l´.p AF th`nh c´c l´.p con AFij mˆt c´ch dˆ d`ng. Tuy nhiˆn, hiˆu a a o e o . . ’ ´ ` ´ ´ ´ ` ’ e o ’ a ’ o n˘ng cua hˆ thˆng s˜ tˆt khi co. chˆ c´