Cisco Catalyst 3650 Series

When you configure the filter command on a monitored trunk interface, only traffic on that set of specified
VLANs is monitored.
Examples
The following example shows how to configure source VLAN filtering:
Switch(config)# monitor session 2 type erspan-source
Switch(config-mon-erspan-src)# filter vlan 3
Related Commands
DescriptionCommand
Configures a local ERSPAN source session.monitor session type erspan-source
Command Reference, Cisco IOS XE Everest 16.5.1a (Catalyst 3650 Switches)
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filter (ERSPAN)