Cisco Systems BC-23 manual BC-26, Bridge-Group Virtual Interface in the Router

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Configuring Transparent Bridging

Technology Overview

Figure 8 Bridge-Group Virtual Interface in the Router

Routed interface

Bridge group 1

E0

E1

 

E3

E2

10.0.0.1

BVI 1

10.0.0.2

Bridged

interfaces

S4757

The bridge-group virtual interface is a normal routed interface that does not support bridging, but does represent its corresponding bridge group to the routed interface. It has all the network layer attributes (such as a network layer address and filters) that apply to the corresponding bridge group. The interface number assigned to this virtual interface corresponds to the bridge group that this virtual interface represents. This number is the link between the virtual interface and the bridge group.

When you enable routing for a given protocol on the bridge-group virtual interface, packets coming from a routed interface, but destined for a host in a bridged domain, are routed to the bridge-group virtual interface and are forwarded to the corresponding bridged interface. All traffic routed to the bridge-group virtual interface is forwarded to the corresponding bridge group as bridged traffic. All routable traffic received on a bridged interface is routed to other routed interfaces as if it is coming directly from the bridge-group virtual interface.

To receive routable packets arriving on a bridged interface but destined for a routed interface or to receive routed packets, the bridge-group virtual interface must also have the appropriate addresses. MAC addresses and network addresses are assigned to the bridge-group virtual interface as follows:

•The bridge-group virtual interface “borrows” the MAC address of one of the bridged interfaces in the bridge group associated with the bridge-group virtual interface.

•To route and bridge a given protocol in the same bridge group, you must configure the network layer attributes of the protocol on the bridge-group virtual interface. No protocol attributes should be configured on the bridged interfaces, and no bridging attributes can be configured on the bridge-group virtual interface.

Note When a bridged domain contains learning devices (such as switches or bridges) that can learn the MAC address of a bridge-group virtual interface, the virtual interface must be configured with its own MAC address—separate from the MAC addresses of the bridged interfaces in the bridge group that are associated with the virtual interface. The MAC address is configured by using the mac-addressvirtual interface command.

Because there can be only one bridge-group virtual interface representing a bridge group, and the bridge group can be made up of different media types configured for several different encapsulation methods, you may need to configure the bridge-group virtual interface with the particular encapsulation methods required to switch packets correctly.

For example, the bridge-group virtual interface has default data link and network layer encapsulations that are the same as those available on Ethernet interfaces, but you can configure the bridge-group virtual interface with encapsulations that are not supported on an Ethernet interface. In some cases, the default encapsulations provide appropriate results; in other cases they do not. For example, with default encapsulation, Advanced Research Projects Agency (ARPA) packets from the bridge-group virtual interface are translated to Subnetwork Access Protocol (SNAP) when bridging IP to a Token Ring- or

Cisco IOS Bridging and IBM Networking Configuration Guide

BC-26

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Contents Transparent and SRT Bridging BC-23Integrated Routing and Bridging Transparent Bridging FeaturesBC-24 Bridge-Group Virtual Interface BC-25BC-26 Bridge-Group Virtual Interface in the RouterOther Considerations SRT Bridging FeaturesBC-27 Transparent and SRT Bridging Configuration Task List BC-28Configuring Transparent Bridging and SRT Bridging Assigning Each Network Interface to a Bridge GroupAs Ieee 802.1D standard, DEC or Vlan bridge BC-29Command Purpose Transparently Bridged VLANs for ISLChoosing the OUI for Ethernet Type II Frames BC-30BC-31 Transparently Bridged VLANs on an Fddi BackboneRouting between ISL VLANs BC-32Specifies a subinterface Subinterface with the VlanSame bridge group BC-33Configuring a Subscriber Bridge Group Configuring Transparent Bridging over WANsConfiguring Fast-Switched Transparent Bridging over ATM BC-34Configuring Transparent Bridging over DDR CommandDefining the Protocols to Bridge Specifying the Bridging ProtocolConfiguring Transparent Bridging over Frame Relay Determining Access for BridgingConfiguring an Interface for Bridging Fast-Switched Transparent BridgingConfiguring Transparent Bridging over Multiprotocol Lapb Bridging in a Frame Relay Network with No MulticastsBridging in a Frame Relay Network with Multicasts BC-37Configuring Transparent Bridging over Smds Configuring Transparent Bridging overSpecifies IP-to-X.121 mapping BC-38Configuring Concurrent Routing and Bridging Configuring Integrated Routing and BridgingSpecifies a protocol to be routed on a bridge group BC-39Configuring Interfaces Configuring the Bridge-Group Virtual InterfaceEnabling Integrated Routing and Bridging BC-40Configuring Protocols for Routing or Bridging BC-41Disabling IP Routing Configuring Transparent Bridging OptionsBC-42 Enabling Autonomous Bridging Configuring LAT CompressionBC-43 Establishes a multiple spanning-tree domain Establishing Multiple Spanning-Tree DomainsBC-44 Configuring Bridge Table Aging Time Filtering Transparently Bridged PacketsForwarding Multicast Addresses BC-45Setting Filters at the MAC Layer BC-46Filters particular MAC-layer station addresses Filtering by Vendor CodeEthernet-ordered MAC address BC-47Type Filtering by Protocol TypeBC-48 Defining and Applying Extended Access Lists Configuration modeInterface BC-49BC-50 Enabling LAT Group Code Service Filtering Filtering LAT Service AnnouncementsBC-51 Adjusting Spanning-Tree Parameters BC-52Setting the Bridge Priority Setting an Interface PriorityAdjusting Bpdu Intervals Assigning Path CostsAdjusting the Interval between Hello BPDUs Defining the Forward Delay IntervalDisabling the Spanning Tree on an Interface 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-60Configuring Constrained Multicast Flooding Configures a transmission pause intervalDistributes base load on the source MAC address only 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 Two Router OneBC-68 Router Three BC-69Ethernet-to-FDDI Transparent Bridging Example Routing between VLANs Configuration ExampleBC-70 Router/Bridge in Building Ethernet Bridging ExampleBC-71 SRT Bridging Example BC-72Configuration for the New York City Router Configuration for the Thule, Greenland RouterMulticast or Broadcast Packets Bridging Example BC-73Transparent Bridging Example Configuration for BridgeBC-74 Bridging in a Frame Relay Network with No Multicasts Frame Relay Transparent Bridging ExamplesBC-75 Bridging in a Frame Relay Network with Multicasts Transparent Bridging over Multiprotocol Lapb ExampleBC-76 Transparent Bridging over DDR Examples BC-77Complex Transparent Bridging Network Topology Example Fast-Switched Transparent Bridging over Smds ExampleBC-78 BC-79 Bridged Subnetworks with DomainsConfiguration for Router a BC-80Configuration for Router B Configuration for Router CConfiguration for Router D BC-81ATM Subscriber Ports, ATM Trunk Example Fast Ethernet Subscriber Port, Frame Relay Trunk ExampleBC-82 BC-83 Configuration of IRB for PA-12E/2FE Port Adapter Example BC-84

BC-23 specifications

Cisco Systems has long been a leader in the networking industry, and its BC-23 model exemplifies the company's commitment to innovation and performance. Aimed at enhancing business operations, the BC-23 is tailored for organizations looking for robust solutions that support their digital transformation efforts.

One of the standout features of the Cisco BC-23 is its advanced networking capabilities. It supports high-speed data transmission, enabling seamless communication across networks. With multi-gigabit Ethernet ports, the BC-23 facilitates faster data rates, accommodating the increasing bandwidth demands of modern applications. This feature is particularly beneficial for businesses that rely heavily on cloud services, video conferencing, and data-heavy applications.

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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