12
-
incoming non-Q frames
can be handled as follows (see figure 10):
-
a default Q-tag can be inserted
-
the priority inside the tag is preserved (this if the VLAN ID is zero but a priority value is set)
-
they can be dropped ( this also for tags in which the VLAN ID is zero)
This can be done with the ‘non-Q frames’ selection box, with the exception of the framesdropping, which is set
by checking the tick boxes of the ‘Drop non-Q-frames’ row in the VLAN Port Control pane (see figure 11
below).
The ingress rules are defined per port, in the VLAN Port Control pane. There, any port can be configured to drop
non-Q-frames (arrow in figure 11). If set, this has prevalence over tag insertion or modification.
Settings example
With VLANs enabled, a port connected to another switch (a non-edge port) generally would be set to:
-
drop non-Q-frames (ingress, per port),
-
do not untag Q-frames (egress, per port, per VLAN)
An edge device generally does not handle received Q-tags or send such tags. However, at the switch input port, a
Q-tag may be inserted holding a VLAN ID and priority assigned to the device according to the ingress rules
defined in the VLAN Port Control pane, so VLAN Control settings for an edge port would be:
-
untag (egress, per port, per VLAN)
-
insert default Q-tag (ingress).
The default Q-tag (per port) is defined on the VLAN Control page, under VLAN Port Control.
Figure 10. 2800 SW VLAN Control , non-Q-frame menu options
Figure 11. 2800 SW VLAN port ingress rules