ZyXEL Communications ZyXEL Dimension ES-2024 - Manual (Page 179)

Dimension ES-2024 Ethernet Switch
IEEE 802.1Q Tagged VLAN 27-7
sys sw vlan1q svlan setentry
where
= A name to identify the SVLAN entry.
= The VLAN ID [1 – 2048].
= This is the switch port number.
= This is the registrar administration control flag.
Valid parameters = [
fixed , forbidden , normal ].
Enter fixed to register a to the static VLAN table with .
Enter normal to confirm registration of the to the static VLAN
table with .
Enter
forbidden to block a from joining the static VLAN table
with .
= This is the tag control flag. Valid parameters = [ tag | untag ].
Enter tag to tag outgoing frames.
Enter untag to send outgoing frames without a tag.
This command adds or modifies an entry in the static VLAN table. Display your configuration by using the sys
sw vlan1q svlan list command. An example of a configuration is shown next.
Modify a Static VLAN Table Example
The following is an example of how to modify a static VLAN table.
Figure 27-12 Modifying the Static VLAN Example
Forwarding Process Example
Tagged Frames
Step 1. First the switch checks the VLAN ID (VID) of tagged frames or assigns temporary VIDs to untagged
frames (see Section 27.4.7).
Step 2. The switch then checks the VID in a frame’s tag against the SVLAN table.
Step 3. The switch notes what the SVLAN table says (that is, the SVLAN tells the switch whether or not to
forward a frame and if the forwarded frames should have tags).
Step 4. Then the switch applies the port filter to finish the forwarding decision. This means that frames may be
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
Step 1. An untagged frame comes in from the LAN.
1. ras> sys sw vlan1q svlan setentry 2000 1 fixed tag
2. ras> sys sw vlan1q svlan setentry 2001 2 fixed tag