Mirroring-source restrictions
In a mirroring session, you can configure any of the following sources of mirrored traffic:
Multiple port and trunk, and/or mesh interfaces
One VLAN
If you configure a VLAN as the source interface in a mirroring session and assign a second VLAN to the session, the second VLAN overwrites the first VLAN as the source of mirrored traffic.
One classifier-based policy
If you configure a mirroring policy on a port or VLAN interface to mirror inbound traffic in a session, you cannot configure a port, trunk, mesh, ACL, or VLAN as an additional source of mirrored traffic in the session.
Up to 320 MAC addresses (used to select traffic according to source, destination MAC address, or both) in all mirroring sessions configured on a switch