EXP Computer PathBuilder S200 Manuel D’Utilisation

54 

Bridging

The Forwarder provides its own filtering facility which is used to reduce unnecessary 
traffic and to provide security. The filtering facility supports the following types of 
filters:

• Incoming Source Address Filter

• Incoming Destination Address Filter

• Outgoing Source Address Filter

• Outgoing Destination Address Filter

The Incoming Source Address Filter filters packets are based on their source address 
and incoming links. Frames with a source address found in the Incoming Source 
Address Filter List are discarded without applying bridge logic. This filter may be 
applied to all links or selected links.

The Incoming Destination Address Filter filters packets based on their destination 
address and the incoming ports. Frames with a destination address found in the 
Incoming Destination Address Filter List are discarded without applying bridge 
logic. This filter may be applied to all links or selected links.

The Outgoing Source Address Filter filters packets based on their source address and 
the outgoing links. Frames with a source address found in the Outgoing 
Source Address Filter List are discarded. This filter may be applied to all links or 
selected links.

The Outgoing Destination Address Filter filters packets based on their destination 
address and the outgoing links. Frames with a destination address found in the 
Outgoing Destination Address Filter List are discarded. This filter may be applied to 
all links or selected links.

When a frame comes from a link with the Unicast Link Protect Flag set, and if its 
source address is not found in the Permanent Station Address list, the frame is 
dropped.

When a frame is being sent out over a link with the Unicast Link Protect Flag set, 
and if its destination address is not found in the Permanent Station Address List, the 
frame is dropped.

Once the Unicast Link Protect Flag is set for a link, source address learning for 
Unicast frames is stopped for that link and all the addresses that were learned before 
are moved into the Permanent Station Address List.

Setting or Clearing of Unicast Link Protect Flag is performed via the LAN Control 
menu located in the Main menu.