Vlan Group Table Configuration; Vlan Classification; Packet Forwarding - KTI Networks KGS-0820 User Manual

Managed 8-port gigabit ethernet switches with 2 sfp slots and poe options

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3.3.5 VLAN Group Table Configuration

The switch provides a table of eight VLAN groups to support up to eight VLANs at the same time. Each

VLAN group is associated to one unique VLAN. The table is referred for VLAN classification.

A VLAN group contains the following configuration settings:

VID: 12-bit VLAN Identifier index to the VLAN to which the group is associated

Member Ports: the admitted egress ports for packets belonging to this VLAN

Source Port Check: the ingress port of the packet must also be the member port of this VLAN. Otherwise, the

packet is discarded.

VLAN classification is a process to classify a VLAN group to which a received packet belongs. The VID of the

generated Packet Tag information associated to the received packet is used as an index for VLAN group table

lookup. The VID matched VLAN group will be used for packet forwarding. If no matched VLAN group is

found in table lookup, the packet is dropped.

Refer to section 3.2.4 for details about how the Packet Tag information is generated.

The member ports specified in the matched VLAN group are the admitted egress port range for the packet. The

packet will never be forwarded to other ports which are not in the member ports.

The Source Port Check setting of the matched VLAN group is also referred. If it is enabled, the ingress port

will be checked whether it is a member port of this group.

The forwarding is a process to forward the received packet to one or more egress ports. The process uses the

following information as forwarding decision:

Member ports of the matched VLAN group: the egress port range for forwarding

Source Port Check setting of the matched VLAN group: check ingress port membership

Packet destination MAC address: for MAC address table loop up

Switch MAC address table: to find the associated port where a MAC address is learned

If the MAC address table lookup is matched and the learned port is the VLAN member port, the packet is

forwarded to the port (egress port). If the lookup failed, the switch will broadcast the packet to all member ports.

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