Tagged Frames Forwarding Example; Untagged Frames Forwarding Example; Vlan Setup Screen - ZyXEL Communications MSC1000G User Manual

MSC1000G User's Guide

15.4 Tagged Frames Forwarding Example

1 First the MSC checks the VLAN ID (VID) of tagged frames or assigns temporary VIDs
to untagged frames.
2 The MSC then checks the VID in a frame's tag against the SVLAN table.
3 The MSC notes what the SVLAN table says (that is, the SVLAN tells the MSC whether
or not to forward a frame and if the forwarded frames should have a tag).
4 Then the MSC 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.

15.5 Untagged Frames Forwarding Example

1 An untagged frame comes in from the LAN.
2 The MSC checks the PVID table and assigns a temporary VID.
3 The MSC ignores the port from which the frame came, because the MSC does not send a
frame to the port from which it came. The MSC also does not forward frames to
"forbidden" ports.
4 If after looking at the SVLAN, the MSC does not have any ports to which it will send the
frame, it won't check the port filter.

15.6 VLAN Setup Screen

Click VLAN > VLAN in the navigation panel to display the screen shown next. You can
assign a port to be a member of a VLAN group or prohibit a port from joining a VLAN group
in this screen. This is an IEEE 802.1Q VLAN.
252 Chapter 15 VLAN Screens