Alcatel Carrier Internetworking Solutions Switch/Router ユーザーズマニュアル

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This chapter describes how to configure and maintain bridging parameters. Bridges are 
devices that interconnect LANs using one (or more) of the available standards such as trans-
parent bridging, source route bridging, or source route to transparent bridging. Bridges prima-
rily operate at Layer 2 of the OSI reference model, which controls data flow, transmission 
errors, physical addressing, and access to physical medium.

There are different types of bridging that are used to manage networks:

•

. Used mainly in Ethernet environments, packets are usually forwarded 

without any changes being made to the packet. An ethernet environment is shown in the 
diagram below:

•

. Used mainly in Token Ring environments, packets are transmitted 

along routes predetermined by explorer frames sent along multiple paths. Source Route 
Bridging modifies the routing information of the packet as it traverses the network. A 
token ring environment is shown in the diagram below: