Cisco Systems BC-23 Manual De Usuario

The Cisco IOS software bridging functionality combines the advantages of a spanning-tree bridge and a 
full multiprotocol router. This combination provides the speed and protocol transparency of an adaptive 
spanning-tree bridge, along with the functionality, reliability, and security of a router. 

This chapter describes how to configure transparent bridging and source-route transparent (SRT) 
bridging. This chapter also describes the concepts of virtual networking, transparent bridging of virtual 
LANs (VLANs), and routing between VLANs. For a complete description of the transparent bridging 
commands mentioned in this chapter, refer to the “Transparent Bridging Commands” chapter in the 
Cisco IOS Bridging and IBM Networking Command Reference, Volume I. To locate documentation of 
other commands that appear in this chapter, use the command reference master index or search online.

This chapter contains the following sections:

The following sections provide an overview of transparent bridging in the Cisco IOS software:

Cisco IOS software supports transparent bridging for Ethernet, Fiber Distributed Data Interface (FDDI), 
and serial media, and supports source-route transparent (SRT) bridging for Token Ring media. In 
addition, Cisco supports all the mandatory Management Information Base (MIB) variables specified for 
transparent bridging in RFC 1286.