> # SPAN Sources

> SPAN sources refer to the interfaces from which traffic can be monitored. You can also specify VSAN as a SPAN source, in which case, all supported interfaces in the specified VSAN are included as SPAN sources. When a VSAN as a source is specified, then all physical ports and PortChannels in that VSAN are included as SPAN sources. You can choose the SPAN traffic in the ingress direction, the egress direction, or both directions for any source interface:

> - Ingress source (Rx)—Traffic entering the switch fabric through this source interface is spanned or copied to the SD port .
> - Egress source (Tx)—Traffic exiting the switch fabric through this source interface is spanned or copied to the SD port .

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