Method of realizing multitransmission
A technology of sending modules and times of sending, applied in store-and-forward switching systems, electrical components, transmission systems, etc., can solve problems such as low efficiency, and achieve the effect of high forwarding efficiency and improved performance
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[0025] The invention provides a method for realizing multicast forwarding on the Intel IXP2400 network processor. Assumption: the encapsulation length of the Layer 2 header is not greater than 32 bytes. The maximum length of the Layer 2 header during SNAP encapsulation is 26 bytes. Referring to Figure 4, construct a multicast header buffer chain, which is consistent with the original design chain, but the buffer size is 32 bytes. Referring to Figure 5, in order to keep the size of the META consistent with the original design, the size also adopts 8 long words. Among them, a multicast flag (M) is added to the multicast META structure, and the original META structure is modified to add a multicast sending times field. (tx_count), the layer-2 encapsulation module allocates a META each time when multicasting, writes the layer-2 header into the corresponding buffer, writes the META sending times field in the first multicast message, and sends the message to The queue management m...
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