3com 520 User Manual

 

 

local LAN because it does not recognize the 

 

destination station as local. However, if the 

 

destination device is on the local LAN, once it replies 

 

to the original source station, its own source address 

 

is part of the data frame and it is learned by the 

 

bridge and added to the address table.

 

By operating in this way, the amount of data 

 

forwarded by the bridge is kept to a minimum. 

 

Traffic that is for devices on the attached LAN is 

 

rarely forwarded over the bridge.

 

A bridge can be configured to forget or 

 

 a 

 

station’s address after a period of inactivity, a facility 

 

which is used to ensure that stations which are no 

 

longer attached to the LAN, do not remain in the 

 

bridge’s address table, using up space that may be 

 

required for other stations’ addresses.

 

Some bridges allow address information to be 

 

manually configured into the bridge, provided the 

 

automatic 

 

 facility is turned off, although this 

 

will not normally prove necessary unless specific 

 

traffic filtering is required.

 

You can also configure a number of other features 

 

to improve the performance and operation of the 

 

OfficeConnect Remote. These include sophisticated 

 

frame filtering techniques so that only certain types 

 

of frame, or those associated with particular work 

 

groups, are passed between specific segments.

 

 

The OfficeConnect Remote is able to send frames 

 

between LANs that may be separated by 

 

considerable physical distances. It achieves this by 

 

making use of Wide Area Network (WAN) links. WANs 

 

can be established by using either digital leased lines 

 

or ISDN and are usually operated by telephone 

 

companies (PTTs) or other service providers. 

 

 

 shows two LAN segments, A and B, which 

 

are connected by a pair of OfficeConnect Remote 

 

units, 1 and 2. The type of link between the two 

 

depends on the WAN services available at each of 

 

the remote bridge locations, and the price the 

 

network administrator is willing to pay for those 

 

services.

Rc.bk : RCAPPA.FRM  Page 3  Thursday, July 10, 1997  9:53 AM