Frame Encapsulation
The switchport encap eisl command applies only to SD (SPAN destination) port interfaces. This command determines the frame format for all frames transmitted by the interface in SD port mode. If the encapsulation is set to EISL, all outgoing frames are transmitted in the EISL frame format, regardless of the SPAN sources. In SD port mode, an interface functions as a SPAN. An SD port monitors network traffic that passes through a Fibre Channel interface. Monitoring is performed using a standard Fibre Channel analyzer (or a similar Switch Probe) that is attached to the SD Port.
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