If you're going to cross switches by trying to capture traffic on 1 switch to a destination port on the other switch, you need to use RSPAN to do it. Normal SPAN will have a source/destination port on a single switch and RSPAN uses a special vlan to carry your monitored information over. Otherwise, you'd set your source port on your primary switch and you can collect information for all ports in a certain vlan, and make your destination the RSPAN vlan. On the other switch, you'd make your source your RSPAN vlan and then your destination port is whatever port your monitoring device is configured on.
* Please rate useful posts *
*** Please rate all useful posts ***