Contemporary Control Systems Compact Managed Switches Software Manual for Web Browser - Manual (Page 24)

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4.4.4.6 Creating VLAN Groups and VIDs
When creating VLANs, several steps and two pages are needed to complete the
configuration. The first step is to define each VLAN Group. Because 8-port switches
can have up to 9 VLAN groups but 16- or 24-port switches can have up to 30 VLAN
groups, the pages differ. Move between pages via the link at the bottom of each page.
For an 8-port switch, the first 7 groups are on Page 1 (Figure 20) and the last 2 groups
are atop Page 2 (Figure 22). For 16- and 24-port units, all groups are defined on Page 1.
Each group can have its Status “Enabled” or “Disabled” and is assigned a default VID.
Set the Group Members (ports) via these drop-down options: In each group, a port can
be omitted (--) or be a Member with No filter (MN) or a Member with a Filter (MF).
NOTE: 8-port units (Figure 20) have a dedicated row of settings for each group, but larger
switches have a bank of settings used for all groups. That is, the settings atop Figure 21
could be used for any group but actually apply to that specified in the Group No. box — and
your settings are confirmed in the read-only scrollable display lower down the page.
When a VLAN frame leaves the switch, take care regarding the VLAN tag it contains. In
Port VLAN mode as shown in Figure 19, the switch will insert a VLAN tag into any frame
arriving from a non-VLAN-aware device. When the frame exits the switch, the tag could
cause a problem if the receiving device is not VLAN-aware.
In an 802.1Q-compliant network, does the unit act as a core switch or an edge switch?
If acting as a core switch, VLAN tags should be kept in the frame. For an edge switch,
VLAN tags should be removed from those ports connected to non-VLAN-aware devices.
NOTE: A switch can act as both a core and edge switch on a port-by-port basis.
To remove tags from frames destined for a non-VLAN-aware device such as PC2 in
Figure 19, choose the “MF” option as for most ports in Figure 20. (The only port not
filtering egress tags is port 2 of group 1). A core switch should have all selected ports
set to “MN” since each of its ports needs to pass frames with tags intact (unfiltered).
Figure 20 — Configure VLAN Groups and VIDs for 8-port Models