CHAPTER 6: OPERATIONAL GUIDE
OPERATIONAL GUIDE
MULTINET4 MULTI-PORT SERIAL SERVER & MANAGED SWITCH – INSTRUCTION MANUAL
6–11
• Strip all tag information (including VID and priority fields) from the frame before
transmission
Tagged Field Set to Yes
When a port has its “Tagged?” field set to “Yes”, that port will:
• Admit untagged or priority-tagged frames and mark them with the port’s PVID
• Admit tagged frames if and only if the tagged VID matches the port's PVID or one
of the VLANs assigned to that port. All other tagged frames will be dropped
• Transmit all frames with an appropriate VLAN tag
6.4.2.3 Filtering
By default a trunk port is a member of all VLANs. It may optionally prohibit traffic from a list
of VLANs which you can configure using the
4.4.4.3: VLAN: Port Settings
screen.
An access port only passes traffic associated with its native VLAN.
6.4.2.4 Frame Classification and Forwarding
Frames that are admitted to the switch are always tagged (with either the frame's original
VID or with the PVID of the port upon which it entered) and the frame's VLAN tag is
included as part of the criteria used by the bridge forwarding process. Specifically, a frame
will only be forwarded on a port that is a member of its tagged VLAN. Note that other
criteria, such as destination MAC address and port state may prevent a frame from being
forwarded on a port even if it has a matching VID.
Default Configuration
By default, all ports are configured with “Tagging” set to “No,” “Mode” set to “Access,” and
nothing configured in Prohibited VLANs field. The default PVID is 1. In this configuration,
the switch accepts untagged and priority-tagged frames as well as frames that are tagged
with the default VLAN (VID 1). All other tagged frames are dropped.
Port-based VLANs
Port-based VLAN functionality may be emulated by making all ports untagged. Each VLAN
operates as a virtual bridge within the larger physical switch. The VLANs have only local
significance since tags are always stripped before a frame is transmitted.
Configure the switch for port-based VLANs by adding a VLAN for each port group in the
following steps:
Z
Go to the
4.4.4.2: VLAN: VIDs
screen.
• Add a VLAN for each group.
• Click the
Apply Settings
button.
Z
Go to the
4.4.4.3: VLAN: Port Settings
screen.
• For each port, select the appropriate PVID based on the desired
group (VLAN) membership.
• Click the
Apply Settings
button.