This does not work for the IDMS-2.
The trunk configuration of the IDSM-2 does NOT work in conjunction with setting the IDSM-2 as a span destination port.
The trunk setting of the IDSM-2 is only used when configuring the IDSM-2 for InLine Vlan Pairs.
For Span monitoring the IDSM-2 needs to be configured for Promiscuous mode and so the Trunk configuration is not used.