On the Cisco 6500 Series switch, each packet received by a port is automatically transmitted on the internal switching bus to every line card. Each line card buffers the packet while the Encoded Address Recognition Logic (EARL) determines the destination of the packet. After the EARL process is complete, the packet is flushed from the buffers for which it is not destined. If the EARL process cannot determine the destination, the packet is sent out of all ports. Because each packet is already copied to each line card, there is no performance impact when configuring a SPAN destination.
The non-blocking architecture of the Cisco 4500 switch also allows for the use of SPAN without performance impact.
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