INTRODUCTION
1.2GETTING HELP
If you need additional support related to the Cabletron Systems NB20E or NB25E Two Port Ethernet Bridge, or if you have any questions, comments or suggestions related to this manual, feel free to contact Cabletron Systems' Technical Support at:
Cabletron Systems Inc.
P.O. Box 6257
E. Rochester, NH
Phone: (603)
1.3THE NB20E AND NB25E TWO PORT ETHERNET BRIDGE
With the Cabletron Systems NB20E or NB25E Two Port Ethernet Bridge, you can dramatically increase the performance of two 10 Mbit per second Ethernet networks efficiently and economically, regardless of the media type. The bridges are designed to increase the efficiency of bandwidth use across a LAN by building a list of local node addresses as it learns which nodes are located on each side of the bridge. This list is called the Source Address Table. The bridge uses the Source Address Table to determine which data packets should be allowed to cross the bridge, keeping local traffic local.
The NB20E Bridge uses a software filter database to check destination addresses against its Source Address Table. The NB25E Bridge uses a higher performance hardware filter database. Both bridges are equipped with a feature called Aging Time, that continually makes space for new entries into the Source Address Table by deleting addresses that are not frequently used.
The NB20E and NB25E are designed to function in
The NB20E and NB25E can be controlled and managed by Cabletron Systems' Remote LANVIEW™ - Network Control Management for the Cabletron Systems' NB20E and NB25E. Remote LANVIEW provides the most complete network management system for Ethernet networks in the industry today. With Remote LANVIEW, a bridge can be managed
