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Chapter 34 IEEE 802.1Q Tagged VLAN Commands
GS-3012/GS-3012F User’s Guide
262
Syntax:
vlan <vlan-id>
fixed <port-list>
forbidden <port-list>
name <name-str>
normal <port-list>
untagged <port-list>
no fixed <port-list>
no forbidden <port-list>
no untagged <port-list>
•Enter fixed to register the <port-list> to the static VLAN table with <vlan-id>.
•Enter
normal to confirm registration of the <port-list> to the static VLAN table with
<vlan-id>.
•Enter
forbidden to block a <port-list> from joining the static VLAN table with
<vlan-id>.
•Enter
no fixed or no forbidden to change <port-list> to normal status.
•Enter
untagged to send outgoing frames without a tag.
•Enter
no untagged to tag outgoing frames.
34.5.4.1 Modify a Static VLAN Table Example
The following example configures ports 1 to 5 as fixed and untagged ports in VLAN 2000.
Figure 165 Modifying Static VLAN Example
34.5.4.2 Forwarding Process Example
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.
where
<vlan-id> =
The VLAN ID [1 – 4094].
<name-str> =
A name to identify the SVLAN entry.
<port-list> =
This is the switch port list.
sysname(config)# vlan 2000
sysname(config-vlan)# fixed 1-5
sysname(config-vlan)# untagged 1-5