Figure 30-8 Modifying Static Vlan Example; Modify A Static Vlan Table Example; Forwarding Process Example; Tagged Frames - ZyXEL Communications Dimension GS-3012F User Manual

Dimension GS-3012F Gigabit Ethernet Switch
where
<vlan-id>
<name-str>
<port-list> =
Enter to register the
fixed
Enter to confirm registration of the
normal
Enter
forbidden
Enter
no fixed
Enter
untagged
Enter
no untagged

Modify a Static VLAN Table Example

The following example configures ports 1 to 5 as fixed and untagged ports in VLAN 2000.
GS-3012F (config)# vlan 2000
GS-3012F (config-vlan)# fixed 1-5
GS-3012F (config-vlan)# untagged 1-5

Forwarding Process Example

Tagged Frames

First the switch checks the VLAN ID (VID) of tagged frames or assigns temporary VIDs to untagged
1.
frames.
The switch then checks the VID in a frame's tag against the SVLAN table.
2.
The switch notes what the SVLAN table says (that is, the SVLAN tells the switch whether or not to
3.
forward a frame and if the forwarded frames should have tags).
Then the switch applies the port filter to finish the forwarding decision. This means that frames may be
4.
dropped even if the SVLAN says to forward them. Frames might also be dropped if they are sent to a CPE
(customer premises equipment) DSL device that does not accept tagged frames.
Untagged Frames
An untagged frame comes in from the LAN.
1.
The switch checks the PVID table and assigns a temporary VID of 1.
2.
The switch ignores the port from which the frame came, because the switch does not send a frame to the
3.
port from which it came. The switch also does not forward frames to "forbidden" ports.
If after looking at the SVLAN, the switch does not have any ports to which it will send the frame, it won't
4.
check the port filter.
30-6
= The VLAN ID [1 – 4094].
= A name to identify the SVLAN entry.
This is the switch port list.
<port-list>
to block a
<port-list>
or to change
no forbidden
to send outgoing frames without a tag.
to tag outgoing frames.

Figure 30-8 Modifying Static VLAN Example

to the static VLAN table with
to the static VLAN table with
<port-list>
from joining the static VLAN table with
to normal status.
<port-list>
IEEE 802.1Q Tagged VLAN Commands
.
<vlan-id>
<vlan-id>
<vlan-id>
.
.