Specifications

Installation and Operation Manual Chapter 1 Introduction
RICi-4E1/T1, RICi-8E1/T1 Ver. 2.0 Functional Description 1-11
Forwarding Process
The forwarding process is performed based on the frame destination MAC VID
pair. The frame is forwarded to the bridge port specified in the MAC table for this
MAC VID pair entry.
Untagged frames are forwarded according to the PVID attached to that frame
during the ingress process.
Frames are forwarded, dropped or flooded as follows:
• Forwarded:
 If the bridge port of the pair entry (DA, VID) in the MAC table is both an
active bridge port and a member of the VLAN – the frame is forwarded to
that bridge port only.
• Dropped:
 If the bridge port for the pair entry (DA, VID) in the MAC table is the port
on which the frame was received, the frame is dropped.
 If there are no active ports associated with the frame’s VID, or if the VID
is not defined at all, the frame is dropped.
• Flooded:
 If the pair (DA, VID) has not been learnt and does not exist in the MAC
table, the frame is transmitted to all bridge ports associated with the
frame’s VLAN ID.
 Multicasts and broadcasts are flooded only via the bridge ports whose
VLAN IDs are identical to the frame’s VLAN ID.
Transmission Process
After the forwarding process identifies the destination bridge port/ports to which
the frame should be transmitted, the transmission process transmits it with the
appropriate format. For each VLAN and each port, the user can configure the
frame format to be used:
• VLAN-tagged. Frames are transmitted as follows:
 VLAN-tagged frames are transmitted unchanged.
 Untagged frames are transmitted tagged with priority according to the
default priority of the ingress bridge port, and VID=PVID of the port from
which they have entered.
 Priority-tagged frames are transmitted tagged with original priority and
VID = PVID.
• Untagged. All frames are transmitted untagged.