ZyXEL Communications VES-1616F-44, User Manual

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VES-1616F/1624F-44 User’s Guide
264 Chapter 34 IEEE 802.1Q Tagged VLAN Commands
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.
3 The switch ignores the port from which the frame came, because the switch does not send
a frame to the port from which it came. The switch also does not forward frames to
“forbidden” ports.
4 If after looking at the SVLAN, the switch does not have any ports to which it will send
the frame, it won’t check the port filter.
34.4 Delete VLAN ID
Syntax:
no vlan <vlan-id>
where
This command deletes the specified VLAN ID entry from the static VLAN table. The
following example deletes entry 2 in the static VLAN table.
sysname(config)# vlan 2000
sysname(config-vlan)# fixed 1-5
sysname(config-vlan)# untagged 1-5
<vlan-id> =
The VLAN ID [1 – 4094].
sysname(config)# no vlan 2