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VLANTagging
VLANTagging
FortiSwitch ports will process tagged and untagged Ethernet frames. Untagged frames do not carry any
VLANinformation.
Tagged frames include an additional header (the 802.1Q header) after the Source MAC address. This header
includes a VLANID.This allows the VLANvalue to be transmitted between switches.
The FortiSwitch provides port parameters to configure and manage VLAN tagging.
Native VLAN
You can configure a native VLANfor each port. The native VLAN is like a default VLANfor untagged incoming
packets. Outgoing packets for the native VLAN are sent as untagged frames.
The native VLANis assigned to any untagged packet arriving at an ingress port.
At an egress port, if the packet tag matches the native VLAN, the packet is sent out without the VLANheader.
Allowed VLANList
The Allowed VLANlist for each port specifies the VLAN tag values for which the port can transmit or receive
packets.
For a tagged packet arriving at an ingress port, the tag value must match a VLANon the Allowed VLANlist. The
native VLANis NOTan allowed value for an incoming tagged packet.
At an egress port, the packet tag must match the native VLAN or a VLANon the Allowed VLANlist.
26 FortiSwitchOS-3.2.0