5 vlan frame type command, Figure 153 modifying the static vlan example – ZyXEL Communications IES-612-51A User Manual
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Chapter 45 IEEE 802.1Q Tagged VLAN Commands
IES-612-51A User’s Guide
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45.4.4.1 Modify a Static VLAN Table Example
The following is an example of how to modify a static VLAN table.
45.4.4.2 Forwarding Process Example
Tagged Frames
1 First the IES-612-51A checks the VLAN ID (VID) of tagged frames or assigns
temporary VIDs to untagged frames (see
2 The IES-612-51A checks the frame’s source MAC address against the MAC filter.
3 The IES-612-51A then checks the VID in a frame’s tag against the SVLAN table.
4 The IES-612-51A notes what the SVLAN table says (that is, the SVLAN tells the IES-
612-51A whether or not to forward a frame and if the forwarded frames should have a
tag).
5 Frames might 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 IES-612-51A checks the frame’s source MAC address against the MAC filter.
3 The IES-612-51A checks the PVID table and assigns a VID and IEEE 802.1Q priority.
4 The IES-612-51A ignores the port from which the frame came, because the IES-612-
51A does not send a frame to the port from which it came. The IES-612-51A also does
not forward frames to “forbidden” ports.
5 If after looking at the SVLAN, the IES-612-51A does not have any ports to which it will
send the frame, it drops the frame.
45.4.5 VLAN Frame Type Command
Syntax:
ras> switch vlan frametype
where
This command sets the specified DSL ports to accept VLAN tagged Ethernet frames, or both
tagged and untagged Ethernet frames.
Figure 153 Modifying the Static VLAN Example
ras> switch vlan set 2000 1:FU
ras> switch vlan set 2001 2:FU
=
You can specify a single DSL port <1>, all DSL ports <*> or
a list of DSL ports <1,3 >. You can also include a range of
DSL ports <1,5,6~10>.
=
Use
tag
to have the specified port(s) accept only incoming
Ethernet frames that have a VLAN tag.
Use
all
to have the specified port(s) accept both tagged and
untagged incoming Ethernet frames.