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5 configure 802.1q vlan menu, 6 vlans and trunking – Contemporary Control Systems Compact Managed Switches Software Manual for Console Access User Manual

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TD020850-0MG

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4.3.5.5 Configure 802.1Q VLAN menu

Figure 12 displays the four functions of the

Configure 802.1Q VLAN menu :

Status (read-only) reports whether or not VLANs are enabled on the switch.

Configure Non-802.1Q Frame Drop Rules (explained in Section 4.2.1.5.9)

Configure VLAN Groups and VID

(explained in Section 4.2.1.5.7)

Configure 802.1Q VLAN Tag

(explained in Section 4.2.1.5.8)

Figure 12 — Configure 802.1Q VLAN

4.3.5.6 VLANS and Trunking

A problem can occur if one of the ports in a trunk is not in the same VLAN as the other

ports in the trunk. Messages will travel over one of the ports in a trunk, but this port

cannot be selected by the user. Messages could also pass successfully through a trunk

via a port in the VLAN — but if that link becomes disrupted, messages would pass

through another trunk port that may not be in the same VLAN. Therefore all of the ports

in a trunk must be in the same VLAN.
Therefore, the rule when using trunking and VLANs is for all ports in the trunk to be in

the same VLAN and have the same default VID number — and every port in potential

use should have a VLAN defined for it.

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