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    • 6. 发明授权
    • Restriction of source address up-dating in network switches
    • 网络交换机中源地址更新的限制
    • US06529507B1
    • 2003-03-04
    • US09253772
    • 1999-02-22
    • Edele O'MalleyKevin JenningsJohn Hickey
    • Edele O'MalleyKevin JenningsJohn Hickey
    • H04J324
    • H04L45/742H04L49/351H04L49/354
    • A forwarding database in a network switch is established and maintained by performing a look-up for a source address read from an incoming frame to find a match between the source address in the frame and the source address in an entry which includes that source address, a port number and an age field. New entries are made if matches are not found, so that the forwarding database facilitates the dispatch of frames to destination addresses corresponding to source addresses in the table. The switch maintains a system age, such as a two-bit field, which is changed from time to time and the current system age is entered in the table as the age field when a source address entry is made. When said source address is found by a look-up process, it is updated with the current system age only if the age field of the entry and the current system age do not correspond. There is a saving of bandwidth arising from the avoidance of write cycles when an age field of an entry corresponds to the current system age.
    • 通过执行从输入帧读取的源地址的查找来查找网络交换机中的转发数据库,​​以在包含该源地址的条目中找到帧中的源地址与源地址之间的匹配, 一个港口号码和一个年龄域。 如果未找到匹配项,则创建新条目,以便转发数据库便于将帧分派到与表中的源地址对应的目标地址。 交换机维护系统时代,例如两位字段,当进行源地址表项时,它将不时更改,并将当前系统时间作为年龄字段输入表中。 当通过查找过程找到所述源地址时,仅当条目的年龄字段和当前系统时间不对应时才更新当前系统时间。 当条目的年龄字段对应于当前系统时代时,避免了写周期产生的带宽的节省。