Forwarding Process Example - ZyXEL Communications VDSL SWITCH VES-1616F-3X User Manual

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>
where
<vlan-id>
<name-str>
<port-list> =
• Enter
fixed
• Enter
normal
<vlan-id>
• Enter
forbidden
<vlan-id>
• Enter
no fixed
• Enter
untagged
• Enter
no untagged
The following example configures ports 1 to 5 as fixed and untagged ports in VLAN 2000.
sysname(config)# vlan 2000
sysname(config-vlan)# fixed 1-5
sysname(config-vlan)# untagged 1-5

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.
VES-1616F-3x Series User's Guide
The VLAN ID [1 – 4094].
=
A name to identify the SVLAN entry.
=
This is the switch port list.
to register the
<port-list>
to confirm registration of the
.
to block a
<port-list>
.
or
no forbidden
to send outgoing frames without a tag.
to tag outgoing frames.
Chapter 34 IEEE 802.1Q Tagged VLAN Commands
to the static VLAN table with
to the static VLAN table with
<port-list>
from joining the static VLAN table with
to change
<port-list>
.
<vlan-id>
to normal status.
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