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3010E/3020E/3040E G.SHDSL.bis EFM Bridge Modem User’s Manual Ver:A2
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Untagged VLANs – Untagged (or static) VLANs are typically used to reduce broadcast traffic and to increase
security. A group of network users assigned to a VLAN form a broadcast domain that is separate from other
VLANs configured on the EFM modem. Packets are forwarded only between ports that are designated for the
same VLAN. Untagged VLANs can be used to manually isolate user groups or subnets.
PVID - VLAN ID assigned to untagged frames received on the interface. (Default: 1)
If an interface is not a member of VLAN 1 and you assign its PVID to this VLAN, the interface will
automatically be added to VLAN 1 as an untagged member. For all other VLANs, an interface must first be
configured as an untagged member before you can assign its PVID to that group.
Link Type - Sets the port to accept the frame types: “Access” means the port can only receive or send
untagged frame types. “Trunk” means that the port can only receive or send tagged frame types.
3.5.2.2 Port-Based VLAN
Click Port-Based VLAN to configure the EFM modem.
Port-Based VLANs are VLANs where the packet forwarding decision is based on the destination MAC
address and its associated port.
When using the port-based VLAN, the port is assigned to a specific VLAN independent of the user or system
attached to the port. This means all users attached to the port should be members in the same VLAN. The
network administrator typically performs the VLAN assignment. The port configuration is static and cannot be
automatically changed to another VLAN without manual reconfiguration.
As with other VLAN approaches, the packets forwarded using this method do not leak into other VLAN
domains on the network. After a port has been assigned to a VLAN, the port cannot send to or receive from
devices in another VLAN.
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