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    • 2. 发明申请
    • DEVICE AND METHOD FOR PACKET INSPECTION
    • 分组检查的装置和方法
    • WO0156327A9
    • 2001-11-08
    • PCT/US0101002
    • 2001-01-11
    • CELOX NETWORKS INCMAHER MONIERSCHMID OTTO ANDREASBORDES JEAN PIERREHEGDE MANJUDAVIS CURTIS
    • MAHER MONIERSCHMID OTTO ANDREASBORDES JEAN PIERREHEGDE MANJUDAVIS CURTIS
    • H04L12/54H04L12/70H04Q11/04H04L12/56
    • H04Q11/0478H04L12/56H04L2012/5667
    • A method and device for packet inspection whereby packets presented via an interleaved cell stream can be inspected "on the fly" to identify, for example, the sequence of protocol encapsulations for each packet, as well as those portions of the packet which should be captured. The packet inspector is therefore capable of operating at high speeds. The packet inspector can also be used to inspect the payload portion of packets, if desired. A connection table look-up unit is used that accesses connection-based control data from a connection table for each cell input to the packet inspector. The look-up unit forwards the cell-specific control data to a data inspector via a forward control path, and the data inspector uses this control data when processing the associated cell. When processing of that cell is complete, the data inspector updates the associated control data to summarize its findings thus far, and then sends the updated control data back towards the look-up unit via a reverse control path for storage. When the next cell of the same packet is presented to the packet processor, the look-up unit retrieves and forwards the stored control data, which the data inspector uses to resumes the packet inspection process. A mechanism is also provided for replacing the control data for a cell propagating on the forward control path with updated control data that is propagating on the reverse control path.
    • 用于分组检查的方法和装置,其中可以“即时”检查经由交织的小区流所呈现的分组,以识别例如每个分组的协议封装的序列以及应该被捕获的分组的那些部分 。 因此,数据包检查器能够以高速运行。 如果需要,分组检查器也可以用于检查分组的有效载荷部分。 使用连接表查找单元,该连接表查找单元从连接表访问基于连接的每个单元输入到分组检查器的控制数据。 查找单元经由前向控制路径将小区特定控制数据转发到数据检查器,并且当处理相关联的小区时,数据检查器使用该控制数据。 当该单元的处理完成时,数据检查器更新关联的控制数据以总结其到目前为止的发现,然后经由反向控制路径将更新的控制数据发送回查找单元用于存储。 当相同分组的下一个小区被呈现给分组处理器时,查找单元检索并转发存储的控制数据,数据检查器使用该控制数据来恢复分组检查过程。 还提供了一种机制,用于用在反向控制路径上传播的更新的控制数据来替换在前向控制路径上传播的单元的控制数据。