Cisco Systems Guide to Configuring Bridge Group and Bridging in Cisco Routers
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Configuring Transparent Bridging

Transparent and SRT Bridging Configuration Task List

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

Prior to configuring the router for integrated routing and bridging, you must enable bridging by setting up a bridge group number and specifying a Spanning-Tree Protocol. You can choose either the IEEE 802.1D Spanning-Tree Protocol or the earlier Digital protocol upon which this IEEE standard is based.

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}

 

 

 

The IEEE 802.1D Spanning-Tree Protocol is the preferred way of running the bridge. Use the Digital Spanning-Tree Protocol only for backward compatibility.

Configuring Interfaces

To configure a router interface in the Cisco IOS software, use the following commands beginning in global configuration mode:

 

Command

Purpose

Step 1

 

 

interface type number

Specifies the interface and enters interface configuration mode.

Step 2

 

 

port

Specifies concentrator port operation.

Step 3

 

 

bridge-group bridge-group

Assigns bridge-groups to appropriate interfaces.

 

 

 

Enabling Integrated Routing and Bridging

 

After you have set up the interfaces in the router, you can enable integrated routing and bridging.

 

To enable integrated routing and bridging in the Cisco IOS software, use the following command in

 

global configuration mode:

 

 

 

 

Command

 

Purpose

 

 

 

 

bridge irb

 

Enables integrated routing and bridging.

 

 

 

 

 

Use the show interfaces irb privileged EXEC command to display the protocols that a given bridged

 

interface can route to the other routed interface when the packet is routable, and to display the protocols

 

that a given bridged interface bridges.

Configuring the Bridge-Group Virtual Interface

The bridge-group virtual interface resides in the router. It acts like a normal routed interface that does not support bridging, but represents the entire corresponding bridge group to routed interfaces within the router. The bridge-group virtual interface is assigned the number of the bridge group that it represents. The bridge-group virtual interface number is the link between the bridge-group virtual interface and its bridge group. Because the bridge-group virtual interface is a virtual routed interface, it has all the network layer attributes, such as a network address and the ability to perform filtering. Only one bridge-group virtual interface is supported for each bridge group.

Cisco IOS Bridging and IBM Networking Configuration Guide

BC-40

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Contents Transparent and SRT Bridging BC-23Transparent Bridging Features Integrated Routing and BridgingBC-24 Bridge-Group Virtual Interface BC-25BC-26 Bridge-Group Virtual Interface in the RouterSRT Bridging Features Other ConsiderationsBC-27 Transparent and SRT Bridging Configuration Task List BC-28As Ieee 802.1D standard, DEC or Vlan bridge Configuring Transparent Bridging and SRT BridgingAssigning Each Network Interface to a Bridge Group BC-29Choosing the OUI for Ethernet Type II Frames Command PurposeTransparently Bridged VLANs for ISL BC-30BC-31 Transparently Bridged VLANs on an Fddi BackboneRouting between ISL VLANs BC-32Same bridge group Specifies a subinterfaceSubinterface with the Vlan BC-33Configuring Fast-Switched Transparent Bridging over ATM Configuring a Subscriber Bridge GroupConfiguring Transparent Bridging over WANs BC-34Defining the Protocols to Bridge Configuring Transparent Bridging over DDRCommand Specifying the Bridging ProtocolConfiguring an Interface for Bridging Configuring Transparent Bridging over Frame RelayDetermining Access for Bridging Fast-Switched Transparent BridgingBridging in a Frame Relay Network with Multicasts Configuring Transparent Bridging over Multiprotocol LapbBridging in a Frame Relay Network with No Multicasts BC-37Specifies IP-to-X.121 mapping Configuring Transparent Bridging over SmdsConfiguring Transparent Bridging over BC-38Specifies a protocol to be routed on a bridge group Configuring Concurrent Routing and BridgingConfiguring Integrated Routing and Bridging BC-39Enabling Integrated Routing and Bridging Configuring InterfacesConfiguring the Bridge-Group Virtual Interface BC-40Configuring Protocols for Routing or Bridging BC-41Configuring Transparent Bridging Options Disabling IP RoutingBC-42 Configuring LAT Compression Enabling Autonomous BridgingBC-43 Establishing Multiple Spanning-Tree Domains Establishes a multiple spanning-tree domainBC-44 Forwarding Multicast Addresses Configuring Bridge Table Aging TimeFiltering Transparently Bridged Packets BC-45Setting Filters at the MAC Layer BC-46Ethernet-ordered MAC address Filters particular MAC-layer station addressesFiltering by Vendor Code BC-47Filtering by Protocol Type TypeBC-48 Interface Defining and Applying Extended Access ListsConfiguration mode BC-49BC-50 Filtering LAT Service Announcements Enabling LAT Group Code Service FilteringBC-51 Adjusting Spanning-Tree Parameters BC-52Adjusting Bpdu Intervals Setting the Bridge PrioritySetting an Interface Priority Assigning Path CostsDisabling the Spanning Tree on an Interface Adjusting the Interval between Hello BPDUsDefining the Forward Delay Interval Defining the Maximum Idle IntervalBC-55 Configuring the PA-12E/2FE Port Adapter BC-56Monitoring and Maintaining the PA-12E/2FE Port Adapter BC-57BC-58 BC-59 Configuring Circuit Groups BC-60Distributes base load on the source MAC address only Configuring Constrained Multicast FloodingConfigures a transmission pause interval BC-61BC-62 Basic Bridging Example BC-63Concurrent Routing and Bridging Example BC-64Basic Integrated Routing and Bridging Example BC-65Complex Integrated Routing and Bridging Example BC-66Transparently Bridged VLANs Configuration Example BC-67Router One Router TwoBC-68 Router Three BC-69Routing between VLANs Configuration Example Ethernet-to-FDDI Transparent Bridging ExampleBC-70 Ethernet Bridging Example Router/Bridge in BuildingBC-71 SRT Bridging Example BC-72Multicast or Broadcast Packets Bridging Example Configuration for the New York City RouterConfiguration for the Thule, Greenland Router BC-73Configuration for Bridge Transparent Bridging ExampleBC-74 Frame Relay Transparent Bridging Examples Bridging in a Frame Relay Network with No MulticastsBC-75 Transparent Bridging over Multiprotocol Lapb Example Bridging in a Frame Relay Network with MulticastsBC-76 Transparent Bridging over DDR Examples BC-77Fast-Switched Transparent Bridging over Smds Example Complex Transparent Bridging Network Topology ExampleBC-78 BC-79 Bridged Subnetworks with DomainsConfiguration for Router a BC-80Configuration for Router D Configuration for Router BConfiguration for Router C BC-81Fast Ethernet Subscriber Port, Frame Relay Trunk Example ATM Subscriber Ports, ATM Trunk ExampleBC-82 BC-83 Configuration of IRB for PA-12E/2FE Port Adapter Example BC-84

BC-23 specifications

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Security is a top priority, and the Cisco BC-23 incorporates cutting-edge security measures. Integrated threat detection and prevention systems help safeguard sensitive data from cyber threats. Additionally, the device supports secure access protocols, ensuring that only authorized users can connect to the network. This multi-layered security approach not only protects the network infrastructure but also secures the integrity of the data being transmitted.

Another significant characteristic of the BC-23 is its support for software-defined networking (SDN). This technology allows businesses to manage their networks through centralized software applications, facilitating real-time adjustments and optimizations. The flexibility afforded by SDN is especially advantageous in dynamic environments where network demands can shift rapidly.

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.

Furthermore, the BC-23 is designed for scalability. As organizations grow, their networking needs evolve, and the BC-23 can easily adapt to these changes. Businesses can add additional devices and capabilities without the need for a complete overhaul of their existing infrastructure.

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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