国家重点买验室 不同会话过程的标识方法 ·对于虚电路(VC)方式，对于不同的会话过程，采用 虚电路号进行标识，即每个分组含有一个虚电路号。 VC11 VC13 VC7 链路(3,5) 7c4 链路(8,7) 5 链路(58) VC3 VC3 链路(8,2) 链路(6,5)/ VC7 (3,5)VC13-(5,8)VC7 (3,5)VC7-(5,8)VC4 (6,5)VC3-(5,8)VC3 Each node maintains a table mapping each The nice thing about these virtual channels busy incoming virtual channel on each link onto is that each link has its own set of virtual the corresponding outgoing virtual channel and channels,so that no coordination is required link for the corresponding session between the links with respect to numbering 国家重点实验室 不同会话过程的标识方法 • 对于虚电路（VC）方式，对于不同的会话过程，采用 虚电路号进行标识，即每个分组含有一个虚电路号。 5 8 3 6 2 7 链路（5,8） 链路（3,5） 链路（6,5） 链路（8,2） 链路（8,7） VC7 VC13 VC4 VC11 VC3 VC3 VC7 VC6 VC7 （3,5)VC13－（5,8)VC7 （3,5）VC7－（5,8）VC4 （6,5）VC3－（5,8)VC3 The nice thing about these virtual channels is that each link has its own set of virtual channels, so that no coordination is required between the links with respect to numbering Each node maintains a table mapping each busy incoming virtual channel on each link onto the corresponding outgoing virtual channel and link for the corresponding session