This implementation way is not old to showing a net to transform, and support all enter receiving means, alleviated of BRAS receive pressure, but gather together accordingly switching equipment and DSLAM/ between 2 switching equipment, original be based on BRAS group to sow duplicate bandwidth pressure to do not have improvement, and consider to control user group to sow the issue that receives even, the transition that suits IPTV business to begin level.
Be based on 2 switching equipment group sow duplicate mode
Machine of this STB(of implementation means user carries a box on the head) can use a variety of enter receiving means, PPPOE or IPOE, but use PPPOE to receive fashionable, STB must support double inn, can send the IGMP message that is based on IPOE to enclose, 2 switching equipment are terminative the IGMP message of STB, responsible will group the business of IPTV direct seeding that sows M-VLAN is pressed receive port to duplicate user.
Review analyse: This implementation means suits all enter receiving means, but when STB use PPPOE is received fashionable, STB must support double inn, can send the IGMP message; that is based on IPOE to enclose 2 switching equipment come the direct seeding business between IPTV business reference point is used group sow M-VLAN to bear the weight of, switching equipment has IGMPProxy function, the means that can use be pulled below active static state or next dynamic pulling sows IPTV group business to pass group sow M-VLAN to send touch to gather together switching equipment, press next need to cross VLAN to duplicate to should realize means to be transformed to showing a network to user; bigger, right all do not support group of sowed 2 layer switching equipment to all need to change, support all enter receiving means, alleviated the group of above of 2 switching equipment sows duplicate pressure, but consider to control user group to sow the issue that receives even, number level is put in large-scale IPTV, 2 switching equipment serve as group sow duplicate / reference point, it is best choice.
Rich amounts to switching equipment to have relatively whole QOS strategy: HeadOfLine prevents;WRED of 8 when every port of congest mechanism; sends alignment map 802.1p 4 times first step, WFQ, SP and FIFO alignment attemper algorithm, satisfied IPTV place to need to beg, its group sows an agreement expression is quite perfect also, include IGMPSnooping group to sow message to monitor;IGMPv1/v2/v3;PIM-SM automatically, road of broadcast of much dot of OLINK&PIM-DM;DVMRP(distance vector by the agreement) ;GMRP(group sows trends to register consultative) , in safe character and network management field, rich amounts to switching equipment all sorts of meticulous requirements that each function index all satisfies the line on IPTV, can the need that utmost ground satisfies IPTV.