由于分区树具有路由选择功能，所以ASTR结合了先应式路由协议和按需路由协议的优点。
ASTR combines the merits of proactive routing protocol and on-demand routing protocol because subarea tree has the function of routing selection.
当这些需求需要使用ESB基本功能(如消息路由、转换或协议中介)之一时，则ESB是最佳选择。
If the requirements call for one of the basic ESB functions, such as message routing, transformation or protocol mediation, an ESB would be the clear choice.
它主要用于光网络的光交叉(OXC)节点系统中，用来实现全光层次的路由选择、波长选择、光交叉连接等功能。
Optical switch is chiefly used in OXC (optical Cross Connection) system in optical network. It can fulfill many functions such as routing, selecting optical wavelength and OXC etc.
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