ET42202M-S-PD
L2+ Managed 20-port 100Base-FX/1000Base-X SFP + 4-port 10/100/1000Base-T or
100/1000Base-FX SFP Combo Optical Ethernet Switch with AC + DC inputs
www.ot-systems.com Ver.1.0
148
Ports in Trunk and Hybrid mode may control which VLANs they are allowed to become
members of. Access ports can only be member of one VLAN, the Access VLAN.
The field's syntax is identical to the syntax used in the
Existing VLANs
field. By default, a
port may become member of all possible VLANs, and is therefore set to
1
-
4095
.
The field may be left empty, which means that the port will not be member of any of the
existing VLANs, but if it is configured for
VLAN Trunking
it will still be able to carry all
unknown VLANs.
Forbidden VLANs :
A port may be configured to never be member of one or more VLANs. This is particularly
useful when dynamic VLAN protocols like MVRP and GVRP must be prevented from
dynamically adding ports to VLANs.
The trick is to mark such VLANs as forbidden on the port in question. The syntax is identical
to the syntax used in the
Existing VLANs
field.
By default, the field is left blank, which means that the port may become a member of all
possible VLANs.
