ZyXEL Communications AAM1212, User Manual

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AAM1212 User’s Guide
Chapter 28 Switch Commands 231
3 The AAM notes what the SVLAN table says (that is, the SVLAN tells the AAM whether
or not to forward a frame and if the forwarded frames should have a tag).
4 Then the AAM 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.
28.8.7.2.2 Untagged Frames
1 An untagged frame comes in from the LAN.
2 The AAM checks the PVID table and assigns a temporary VID.
3 The AAM ignores the port from which the frame came, because the AAM does not send
a frame to the port from which it came. The AAM also does not forward frames to
“forbidden” ports.
4 If after looking at the SVLAN, the AAM does not have any ports to which it will send the
frame, it won’t check the port filter.
28.8.8 VLAN Frame Type Command
Syntax:
switch vlan frametype <portlist> <all|tag|untag>
where
This command sets the specified DSL ports to accept VLAN tagged Ethernet frames, untagged
Ethernet frames or both.
Note: The AAM accepts both tagged and untagged incoming frames on the Ethernet
ports.
The following example sets the AAM to accept only VLAN tagged Ethernet frames on DSL
port 3.
<portlist>
= 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>.
<all|tag|untag>
= Use tag to have the specified port(s) accept only incoming
Ethernet frames that have a VLAN tag.
Use untag to have the specified port(s) accept only incoming
Ethernet frames that do not have a VLAN tag.
Use all to have the specified port(s) accept both tagged and
untagged incoming Ethernet frames.