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VES-1124 User’s Guide
IEEE 802.1Q Tagged VLAN 26-7
<name> = A name to identify the SVLAN entry.
<VID> = The VLAN ID [1 – 4094].
<port> = This is the switch port number.
<adctl> = This is the registrar administration control flag.
Valid parameters = [
fixed
,
forbidden
,
normal
].
Enter
fixed
to register a
<port #>
to the static VLAN table with
<vid>
.
Enter
normal
to confirm registration of the
<port #>
to the static VLAN
table with
<vid>
.
Enter
forbidden
to block a
<port #>
from joining the static VLAN table
with
<vid>
.
<tagctl> =
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 26-12 Modifying the Static VLAN Example
Forwarding Process Example
Tagged Frames
1.
First the switch checks the VLAN ID (VID) of tagged frames or assigns temporary VIDs to untagged
frames (see Section 26.4.7).
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.
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.
1. VES-1124> sys sw vlan1q svlan setentry 2000 1 fixed tag
2. VES-1124> sys sw vlan1q svlan setentry 2001 2 fixed tag