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5. 2800 SW VLANs
XSNet 2800 switches support up to 50 virtual tagged LANs, organizing ports into separate groups. These
VLANs are to be enabled from the VLAN Control menu with at least one entry in the VLAN Port Control menu,
and
a management VLAN defined. The latter is essential: without it, all in-band contact with the switch would
be lost.
So: define a management VLAN first before enabling VLANs.
The 802.1q tags can contain a VLAN ID and/or a priority level. If only the latter is present, the VID is zero; the
frame is then called a ‘P-frame’ (priority-only frame) not to be confused with a pause frame.
VLAN entries: defining a 2800 SW tagged VLAN
On the VLAN Entries page, use the edit window (see figure 7) to fill in a row for each VLAN you want to
define. For each port, two entries must be considered:
-
the
port VLAN membership
, indicating that a port should be a member of the VLAN to be defined
(membership of more than one VLAN is of course allowed)
-
untag
(i.e. remove Q-tags), indicating that tags holding VLAN and priority information should be
removed from the output.
For a port connected to another switch, there should be no untagging if the VLAN extends over several
switches. For edge ports, the stream should generally be untagged.
A management computer should be connected to an untagging VLAN port unless the application running on it
and the network interface card involved will handle Q-tags sensibly.
By clicking on an existing VLAN entry, it can be edited in the edit window, indicated by the arrow. Pressing
SAVE
will consolidate the modified entry if the VLAN ID did not change, or add an entry if a new VLAN ID
was added.
Pressing the
DELETE
button while an entry is present in the edit window will irrevocably disable and remove
that VLAN.
Remember to use the
SAVE
button to store your VLAN definitions and settings.
Before enabling VLANs on the VLAN control page, be certain to fill in matching VLAN IDs in the VLAN Port
Control pane there.
Figure 7. 2800 SW VLAN entries. The arrow indicates the edit window