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Chapter 1 Introduction Installation and Operation Manual

1-14 Functional Description Egate-100 Ver. 4.0

actual aging time that can reach up to twice the value that was configured by the

user.

Forwarding Process

The forwarding process is performed based on the frame destination MAC-VID

pair. The frame is forwarded to the bridge port that was specified in the MAC

table for this MAC-VID pair entry.

Untagged frames are forwarded according to the PVID that was attached to the

frame during the ingress process.

Frames are forwarded, dropped, or flooded according to these guidelines:

• 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 –

 Local Filtering: 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, the frame is

dropped.

• Flooded –

 If the pair (DA, VID) is not learned and does not exist in the MAC table,

the frame is transmitted to all bridge ports that are associated with the

frame VLAN ID, unless Split Horizon is enabled on the remote side.

 Multicasts and broadcasts are flooded only through the bridge ports

whose VLAN ID is identical to the frame VLAN ID, unless Split Horizon is

enabled on the remote side.

Egress 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 (egress tag-handling configuration).

You can configure the frame format to be used at egress per port:

• None (do not strip VLAN) –

 VLAN-tagged frames are transmitted unchanged, or with PVID tag

stacking if this is enabled

 Untagged frames are transmitted tagged with the VLAN priority that was

set when entering the Gigabit Ethernet port; VID is the PVID of that port.

 Priority-tagged frames are transmitted tagged with original priority and

VID = PVID

• Strip VLAN – One level of VLAN is stripped from each frame

• Stack VLAN – You can configure the Gigabit Ethernet port to have each

outgoing frame stacked with a predefined VLAN ID; the VLAN priority tag can

be optionally copied.

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RAD Data comm 100 Especificaciones Pagina 46