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1. 发明公开

EP1317825A2 SYSTEM AND METHOD FOR CONTROLLING THE MULTICAST TRAFFIC OF A DATA PACKET SWITCH 有权
标题翻译：系统和方法，用于控制多个流量数据交换中心
公开(公告)号：EP1317825A2
公开(公告)日：2003-06-11
申请号：EP01976198.0
申请日：2001-09-06
申请人： International Business Machines Corporation , IBM FRANCE
发明人： WIND, Daniel , ROMAN, Thierry
IPC分类号： H04L12/56 , H04L12/18
CPC分类号： H04L49/201 , H04L49/103 , H04L49/3009 , H04L49/3018 , H04L49/3027
摘要： The invention allows to assess a level of multicast traffic in a data switch of the kind devised to steer fixed-size data packets, from input to output ports, through a shared memory which temporarily holds a single copy of them in buffers. Output ports are each equipped with an output port queue which contains pointers to those of the buffers holding data packets due to leave the data switch through them. Then, the invention assumes that the total number of shared-memory buffers currently holding a data packet is counted and compared to the total number of buffer pointers found in the output queues. Hence, a metric of the level of multicast traffic is derived resulting in the calculation of a MultiCast Index (MCI). The invention further assumes that data switch is used together with a Switch Core Adaptation Layer (SCAL) which includes a multicast input queue. Because traffic is handled on the basis of a set of priority classes a multicast threshold MCT(P), associated to the multicast input queue, per priority, is set or updated. Therefore, while receiving incoming data traffic, MCI is kept calculated and, for each priority class (P), in each SCAL, MCI is compared to MCT(P) to determine whether corresponding multicast traffic must be held or not. The invention helps preventing traffic congestion in communications networks, using fixed-size data packet switches, that would otherwise occur when a high level of multicast and broadcast traffic has to be supported at network nodes.

2. 发明授权

EP1317825B1 SYSTEM AND METHOD FOR CONTROLLING THE MULTICAST TRAFFIC OF A DATA PACKET SWITCH 有权
标题翻译：系统和方法，用于控制多个流量数据交换中心
公开(公告)号：EP1317825B1
公开(公告)日：2008-08-06
申请号：EP01976198.0
申请日：2001-09-06
申请人： International Business Machines Corporation , IBM FRANCE
发明人： WIND, Daniel , ROMAN, Thierry , BLANC, Alain , BREZZO, Bernard , GALLEZOT, René , LE MAUT, François
IPC分类号： H04L12/56 , H04L12/18
CPC分类号： H04L49/201 , H04L49/103 , H04L49/3009 , H04L49/3018 , H04L49/3027
摘要： The invention allows to assess a level of multicast traffic in a data switch of the kind devised to steer fixed-size data packets, from input to output ports, through a shared memory which temporarily holds a single copy of them in buffers. Output ports are each equipped with an output port queue which contains pointers to those of the buffers holding data packets due to leave the data switch through them. Then, the invention assumes that the total number of shared-memory buffers currently holding a data packet is counted and compared to the total number of buffer pointers found in the output queues. Hence, a metric of the level of multicast traffic is derived resulting in the calculation of a MultiCast Index (MCI). The invention further assumes that data switch is used together with a Switch Core Adaptation Layer (SCAL) which includes a multicast input queue. Because traffic is handled on the basis of a set of priority classes a multicast threshold MCT(P), associated to the multicast input queue, per priority, is set or updated. Therefore, while receiving incoming data traffic, MCI is kept calculated and, for each priority class (P), in each SCAL, MCI is compared to MCT(P) to determine whether corresponding multicast traffic must be held or not. The invention helps preventing traffic congestion in communications networks, using fixed-size data packet switches, that would otherwise occur when a high level of multicast and broadcast traffic has to be supported at network nodes.

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