Perle Systems P840 User Manual download pdf (Page 46)

Filtering

4 From the MAC ADDRESS FILTERS MENU, make sure that the Filter Operation is currently set to

“negative”.

This will cause the MAC Address Filters specified to be used for forwarding frames with the specified MAC

addresses.

5 At this menu, enter a 1.

This will place you at the first EDIT MAC ADDRESS FILTER MENU screen.

At the prompt enter the MAC address for which you want to specify the filter.

6 Enter the 12-digit Ethernet address of the Personal Computer system in the following format:

010203040506 (enter a Return)

The edit screen will fill in the information that the table knows about this address. For this example, let us

assume that it knows that the address status is [not present] and is of [unknown] location.

In this example, the bridge/router is not aware of this station yet. The station has probably not been active

for the bridge/router to “learn” any information about it.

Therefore, you will have to tell the bridge/router a little bit more about the station.

7 Enter a 2 to enter the location of the station.

8 The bridge/router will prompt you for the LAN that the station is located on; enter the name of this

bridge/router’s LAN (LAN456789 for example).

Note that the Status of the address is marked as [present], the location is updated to LAN456789 and the

Permanent entry is [enabled].

9 Enter a 3 to [enable] the “Forward if Source ” parameter. The edit screen will be updated to show the new

information.

At this point, the address is added to the permanent filter table of the local LAN. This entry, therefore, will not be

subject to the aging timer, and will remain active until it is removed from the permanent entry table.

When a frame of information is seen on the local LAN that contains the address of the Personal Computer in the

source field of the frame, the bridge/router will forward it. All other frames seen on the local LAN that are destined

for the remote LAN will be filtered.

Most programmable filtering options may be used for security purposes. The examples above are specific instances where the

two “Forward if” functions may be used. Filter masks are presented in subsequent pages of this section.

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Perle Systems P840 User Manual Page 46