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The SPAN destination port functions properly, but the status is shown as up/down while monitoring Catalyst switches.
The Switched Port Analyzer (SPAN) feature, sometimes called port mirroring or port monitoring, selects network traffic for analysis by a network analyzer such as a SwitchProbe device or other Remote Monitoring (RMON) probe.
It is normal to show the port as up/down monitoring, as long as it is functioning properly. Sometimes when you configure a monitor (SPAN) session, the destination interface shows the down status (monitoring) by design.
The port state is shown in this state to make it evident that the port is currently unusable as a production port. The SPAN session's destination port will always show up as up/down due to the fact that it does not take ingress traffic.