Configuring Transparent Bridging

Transparent and SRT Bridging Configuration Task List

Configuring Transparent Bridging and SRT Bridging

To configure transparent and SRT bridging, you must perform the following tasks:

•Assigning a Bridge Group Number and Defining the Spanning-Tree Protocol

•Assigning Each Network Interface to a Bridge Group

•Choosing the OUI for Ethernet Type II Frames

Assigning a Bridge Group Number and Defining the Spanning-Tree Protocol

The first step in setting up your transparent bridging network is to define a Spanning-Tree Protocol and assign a bridge group number. You can choose either the IEEE 802.1D Spanning-Tree Protocol, the earlier DEC protocol upon which this IEEE standard is based or VLAN bridge Spanning Tree Protocol. Cisco expanded the original 802.1 D Spanning-Tree Protocol in Cisco IOS Release 12.1 by providing VLAN bridge Spanning-Tree Protocol support and increased port identification capability. Furthermore, the enhancement provides:

•More than one byte on a port number to distinguish interfaces

•An improved way to form the port ID

Port Number size of the Port ID support is applied only to IEEE and VLAN-bridge Spanning-Tree Protocols. The DEC protocol only has 8 bits on the Port ID, so the extension of the Port ID cannot be applied.

The expansion of the Port Number field into the port priority portion of the Port ID changes the useful values the port priority can be assigned.

The way to calculate the Port Path Cost is only supported in IEEE and VLAN-bridge Spanning-Tree Protocol environment.

To assign a bridge group number and define a Spanning-Tree Protocol, use the following command in global configuration mode:

Command

Purpose

 

 

bridge bridge-groupprotocol {ieee dec

Assigns a bridge group number and defines a Spanning-Tree Protocol

vlan-bridge}

as IEEE 802.1D standard, DEC or VLAN bridge.

 

 

The IEEE 802.1D Spanning-Tree Protocol is the preferred way of running the bridge. Use the DEC Spanning-Tree Protocol only for backward compatibility. The VLAN-bridge Spanning-Tree Protocol, introduced in Cisco IOS Release 12.1, supports the following media: Ethernet, fast Ethernet, FDDI, ATM and serial (HDLC, PPP, Frame Relay IETF, SMDS, x25).

Assigning Each Network Interface to a Bridge Group

A bridge group is an internal organization of network interfaces on a router. Bridge groups cannot be used outside the router on which it is defined to identify traffic switched within the bridge group. Bridge groups within the same router function as distinct bridges; that is, bridged traffic and bridge protocol data units (BPDUs cannot be exchanged between different bridge groups on a router. Furthermore, bridge groups cannot be used to multiplex or de-multiplex different streams of bridged traffic on a LAN. An interface can be a member of only one bridge group. Use a bridge group for each separately bridged (topologically distinct) network connected to the router. Typically, only one such network exists in a configuration.

Cisco IOS Bridging and IBM Networking Configuration Guide

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Cisco Systems BC-23 Configuring Transparent Bridging and SRT Bridging, Assigning Each Network Interface to a Bridge Group
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BC-23 specifications

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The Cisco BC-23 also offers enhanced management features, allowing IT teams to monitor network performance and analytics effectively. This visibility into network operations enables organizations to identify potential issues before they escalate, minimizing downtime and keeping business processes smooth.

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With its combination of speed, security, and scalability, the Cisco Systems BC-23 is an invaluable asset for modern businesses. It stands out not just as a networking device but as a comprehensive solution that meets the demands of today's fast-paced, technology-driven environment. As companies continue to leverage digital tools for growth and efficiency, the BC-23 will undoubtedly play a significant role in their success.
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