Hello @Scorpion687
In a vPC setup, both switches operate as a single logical entity, so the port-mirroring setup can be done on either switch, and it will capture all the traffic that passes through that particular VLAN on both switches.
In your scenario, if you set up a port mirror on SW1 to mirror all traffic on a VLAN and send it out the green SPAN port, it will capture all the traffic passing through that particular VLAN on both SW1 and SW2. So you don't need to set up another port-mirror on SW2.
However, if you want to capture traffic that only passes through SW2, you can set up another port-mirror on SW2 to mirror the uplink and downlink traffic, and send it to a new port on SW1. Then you can add that port to the source of the port-mirror on SW1. This way, you can capture traffic that is going through SW2 only.
If you want to capture all traffic passing through a particular VLAN, setting up port mirror on either switch in a vPC will suffice. If you want to capture traffic passing through a specific switch, you can set up a port mirror on that switch and send it to the other switch, and then add that port to the source of the port mirror on the other switch.
Best regards
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