Contemporary Control Systems Compact Managed Switches Software Manual for Console Access - Manual (Page 21)

TD020850-0MG
21
4.3.5.7.1 Management Port
If a VLAN is to have full management functionality for any of its ports, it must include the
Management Port as one of its members. This port accomplishes the management
logic solely within the Ethernet controller chip and outside that chip it has no physical
presence at all. It extends management functionality only to the ports with which it
communicates. However, to bestow added security to its member ports, the user may
wish to deliberately create a VLAN that excludes the Management Port — but such a
group cannot support IGMP Snooping, the web server or SNMP.
4.3.5.8 Configure 802.1Q VLAN Tag
802.1Q VLANs require 802.1Q tags in the Ethernet frames that travel through the
switch. With this functionality, the managed switch can participate in a VLAN as either a
core switch or an edge switch.
Frames arriving from non-VLAN devices are “tagless” and cannot function in a VLAN
unless they have tags added to them. The insertion of tags is a function of the ingress
port through which these tagless frames pass into the switch. For this purpose, the
ingress port is assigned a value of Default Tag that is inserted .
Figure 14 displays the
Configure 802.1Q VLAN Tag screen. However, the default VID
tag of the ingress port through which they pass must match the VID of the group to
which the frames are destined. The VLAN group must also be enabled.
Figure 14 — Configure 802.1Q VLAN Tag