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    • 5. 发明授权
    • Stackable network unit including register for identifying trunk connection status of stacked units
    • 可堆叠网络单元,包括用于识别堆叠单元的中继连接状态的寄存器
    • US06801950B1
    • 2004-10-05
    • US09668339
    • 2000-09-25
    • Daniel M O'KeeffeMark A HughesKevin LoughranPaul J Moran
    • Daniel M O'KeeffeMark A HughesKevin LoughranPaul J Moran
    • G06F15173
    • H04L45/00H04L45/245Y02D50/30
    • In a stack of network units each includes a multiplicity of ports for receiving and forwarding addressed data packets and a forwarding engine which in response to address data selects at least one port for the forwarding of a data packet. A cascade connects the units and allows the transmission of a packet placed on said cascade by a unit to all the other units. Each unit is responsive to a packet received from the cascade to forward or discard the received packet according to predetermined forwarding rules. A trunk includes a respective port of each of some but not necessarily all the units. Each unit includes a ‘trunk box member’ register indicating which of the units has at least one port connected in the trunk When a first unit in the stack receives, at a port connected neither to the trunk nor the cascade, a packet destined for the trunk, the first unit directs that packet to a port connected to the trunk if the first unit has such a port and otherwise sends that packet to the cascade. When a second unit in the stack, having a port connected to the trunk, receives by way of the cascade from the first unit a packet destined for the trunk, the second unit determines with recourse to the forwarding rules, data identifying the first unit and the respective register whether to forward said packet to the trunk. The invention is particularly intended for use in stack-wide trunks operating according to ‘local forwarding’ and ‘next-in-line’ rules and allows units in the stack to be omitted from direct connection to the trunk.
    • 在一堆网络单元中,每个端口包括用于接收和转发寻址数据分组的多个端口,以及响应于地址数据选择至少一个用于转发数据分组的端口的转发引擎。 级联连接单元,并允许将放置在所述级联上的分组传输到所有其他单元。 每个单元响应于从级联接收的分组,以根据预定的转发规则转发或丢弃所接收的分组。 一个中继线包括一些但不一定是所有单元的相应端口。 每个单元包括一个“中继箱成员”寄存器,指示哪个单元具有连接在中继中的至少一个端口当堆叠中的第一单元在不连接到中继线和级联的端口处接收到目的地为 中继,如果第一个单元有这样的端口,则第一个单元将该数据包引导到连接到中继的端口,否则将该数据包发送到级联。 当堆叠中具有连接到中继线的端口的第二单元通过级联从第一单元接收到目的地为中继线的分组时,第二单元依据转发规则来确定标识第一单元的数据,以及 相应的寄存器是否将所述分组转发到中继线。 本发明特别旨在用于根据“本地转发”和“下一排”规则操作的堆叠宽中继,并且允许从与直接连接到中继线的堆叠中省略单元。