XtendLan XL-EFM404 G.SHDSL .bis EFM Modem User Manual
V0.01
1. The unit supports up to 8 active VLANs with shared VLAN learning (SVL) bridge out of
4096 possible VLAN specified in IEEE 802.1Q.
2. Each port always belongs to a default VLAN with its port VID (PVID) as an untagged
member. Also, a port can belong to multiple VLANs and be tagged members of these
VLANs.
3. A port must not be a tagged member of its default VLAN.
4. If a non-tagged or null-VID tagged packet is received, it will be assigned with the default
PVID of the ingress port.
5. If the packet is tagged with non-null VID, the VID in the tag will be used.
6. The look up process starts with VLAN look up to determine whether the VID is valid. If
the VID is not valid, the packet will be dropped and its address will not be learned. If the
VID is valid, the VID, destination address, and source address lookups are performed.
7. The VID and destination address lookup determines the forwarding ports. If it fails, the
packet will be broadcasted to all members of the VLAN, except the ingress port.
8. Frames are sent out tagged or untagged depend on if the egress port is a tagged or
untagged member of the VLAN that frames belong.
9. If VID and source address look up fails, the source address will be learned.
Port-Based VLAN
Click Port-Based VLAN to configure the EFM modem.
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