ZyXEL Communications VDSL SWITCH VES-1616F-3X - Manual (Page 263)

Chapter 34 IEEE 802.1Q Tagged VLAN Commands
VES-1616F-3x Series User’s Guide
263
Syntax:
vlan
fixed
forbidden
name
normal
untagged
no fixed
no forbidden
no untagged
where
• Enter fixed to register the 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
.
• Enter no fixed or no forbidden to change to normal status.
• Enter untagged to send outgoing frames without a tag.
• Enter no untagged to tag outgoing frames.
The following example configures ports 1 to 5 as fixed and untagged ports in VLAN 2000.
34.3.5 Forwarding Process Example
34.3.5.1 Tagged Frames
1 First the switch checks the VLAN ID (VID) of tagged frames or assigns temporary VIDs
to untagged frames.
2 The switch then checks the VID in a frame’s tag against the SVLAN table.
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).
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.
34.3.5.2 Untagged Frames
1 An untagged frame comes in from the LAN.
2 The switch checks the PVID table and assigns a temporary VID of 1.
= The VLAN ID [1 – 4094].
= A name to identify the SVLAN entry.
= This is the switch port list.
sysname(config)# vlan 2000
sysname(config-vlan)# fixed 1-5
sysname(config-vlan)# untagged 1-5