The spx layer sits on top of the ipx layer ( layer 3 ) and provides connection - oriented services between two nodes on the network Spx層位于ipx層(第三層)之上,可以為網絡的兩個節點提供基于連接的服務。
There are two main reasons why we do research on traffic engineering . on one hand , it is possible to obtain evident economic benefits by effectively utilizing network facilities . on the other , the emergence of mpls makes it possible to provide connection - oriented service in traditional ip network 我們認為進行流量工程研究主要有兩個原因: 1 )更有效地利用網絡設備可以得到明顯的經濟效益; 2 )隨著mpls ( multiprotocollabelswitching )的出現,使得在傳統ip網絡中提供面向連接的服務成為可能。