About applying multiple mirroring sessions to an interface
You can apply a mirroring policy to an interface that is already configured with another traffic-selection method (MAC-based or all inbound and/or outbound traffic) for a different mirroring session.
The classifier-based policy provides a finer level of granularity that allows you to zoom in on a subset of port or VLAN traffic and select it for local or remote mirroring.
In the following example, traffic on Port b1 is used as the mirroring source for two different, local mirroring sessions:
All inbound and outbound traffic on Ports b1, b2, and b3 is mirrored in session 4.
- Only selected voice traffic on Port b1 is mirrored in session 2.