Cisco Systems BC-23 Configuring Transparent Bridging over DDR, Defining the Protocols to Bridge

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Configuring Transparent Bridging

Transparent and SRT Bridging Configuration Task List

Support for RFC 1483 was added in Cisco IOS Release 12.0(3)T, enabling transparent bridging between Token Ring LANs (using AAL5-SNAP PVCs) and LANs, VLANs or ELANS (using bridged PDUs). RFC 1483 defines an encapsulation type for transferring LAN data via ATM networks.

For more information on configuring ATM, refer to the “Configuring ATM” chapter in the Cisco IOS Wide-Area Networking Configuration Guide.

Configuring Transparent Bridging over DDR

The Cisco IOS software supports transparent bridging over dial-on-demand routing (DDR) and provides you some flexibility in controlling access and configuring the interface.

To configure DDR for bridging, complete the tasks in the following sections:

Defining the Protocols to Bridge

Specifying the Bridging Protocol

Determining Access for Bridging

Configuring an Interface for Bridging

For an example of configuring transparent bridging over DDR, see the section “Transparent Bridging over DDR Examples” section.

Defining the Protocols to Bridge

IP packets are routed by default unless they are explicitly bridged; all others are bridged by default unless they are explicitly routed.

To bridge IP packets, use the following command in global configuration mode:

Command

no ip routing

Purpose

Disables IP routing.

If you choose not to bridge another protocol, use the relevant command to enable routing of that protocol. For more information about tasks and commands, refer to the relevant protocol chapters in the following publications:

Cisco IOS IP and IP Routing Configuration Guide

Cisco IOS AppleTalk and Novell IPX Configuration Guide

Cisco IOS Apollo Domain, Banyan VINES, DECnet, ISO CLNS, and XNS Configuration Guide

Specifying the Bridging Protocol

You must specify the type of spanning-tree bridging protocol to use and also identify a bridge group. To specify the Spanning-Tree Protocol and a bridge group number, use the following command in global configuration mode:

Command

Purpose

 

 

bridge bridge-groupprotocol {ieee dec

Defines the type of spanning tree protocol and identify a bridge group.

vlan-bridge}

 

 

 

The bridge-group number is used when you configure the interface and assign it to a bridge group. Packets are bridged only among members of the same bridge group.

Cisco IOS Bridging and IBM Networking Configuration Guide

BC-35

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Contents BC-23 Transparent and SRT BridgingIntegrated Routing and Bridging Transparent Bridging FeaturesBC-24 BC-25 Bridge-Group Virtual InterfaceBridge-Group Virtual Interface in the Router BC-26Other Considerations SRT Bridging FeaturesBC-27 BC-28 Transparent and SRT Bridging Configuration Task ListAssigning Each Network Interface to a Bridge Group Configuring Transparent Bridging and SRT BridgingAs Ieee 802.1D standard, DEC or Vlan bridge BC-29Transparently Bridged VLANs for ISL Command PurposeChoosing the OUI for Ethernet Type II Frames BC-30Transparently Bridged VLANs on an Fddi Backbone BC-31BC-32 Routing between ISL VLANsSubinterface with the Vlan Specifies a subinterfaceSame bridge group BC-33Configuring Transparent Bridging over WANs Configuring a Subscriber Bridge GroupConfiguring Fast-Switched Transparent Bridging over ATM BC-34Command Configuring Transparent Bridging over DDRDefining the Protocols to Bridge Specifying the Bridging ProtocolDetermining Access for Bridging Configuring Transparent Bridging over Frame RelayConfiguring an Interface for Bridging Fast-Switched Transparent BridgingBridging in a Frame Relay Network with No Multicasts Configuring Transparent Bridging over Multiprotocol LapbBridging in a Frame Relay Network with Multicasts BC-37Configuring Transparent Bridging over Configuring Transparent Bridging over SmdsSpecifies IP-to-X.121 mapping BC-38Configuring Integrated Routing and Bridging Configuring Concurrent Routing and BridgingSpecifies a protocol to be routed on a bridge group BC-39Configuring the Bridge-Group Virtual Interface Configuring InterfacesEnabling Integrated Routing and Bridging BC-40BC-41 Configuring Protocols for Routing or BridgingDisabling 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 Filtering Transparently Bridged Packets Configuring Bridge Table Aging TimeForwarding Multicast Addresses BC-45BC-46 Setting Filters at the MAC LayerFiltering by Vendor Code Filters particular MAC-layer station addressesEthernet-ordered MAC address BC-47Type Filtering by Protocol TypeBC-48 Configuration mode Defining and Applying Extended Access ListsInterface BC-49BC-50 Enabling LAT Group Code Service Filtering Filtering LAT Service AnnouncementsBC-51 BC-52 Adjusting Spanning-Tree ParametersSetting an Interface Priority Setting the Bridge PriorityAdjusting Bpdu Intervals Assigning Path CostsDefining the Forward Delay Interval Adjusting the Interval between Hello BPDUsDisabling the Spanning Tree on an Interface Defining the Maximum Idle IntervalBC-55 BC-56 Configuring the PA-12E/2FE Port AdapterBC-57 Monitoring and Maintaining the PA-12E/2FE Port AdapterBC-58 BC-59 BC-60 Configuring Circuit GroupsConfigures a transmission pause interval Configuring Constrained Multicast FloodingDistributes base load on the source MAC address only BC-61BC-62 BC-63 Basic Bridging ExampleBC-64 Concurrent Routing and Bridging ExampleBC-65 Basic Integrated Routing and Bridging ExampleBC-66 Complex Integrated Routing and Bridging ExampleBC-67 Transparently Bridged VLANs Configuration ExampleRouter Two Router OneBC-68 BC-69 Router ThreeEthernet-to-FDDI Transparent Bridging Example Routing between VLANs Configuration ExampleBC-70 Router/Bridge in Building Ethernet Bridging ExampleBC-71 BC-72 SRT Bridging ExampleConfiguration for the Thule, Greenland Router Configuration for the New York City 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 BC-77 Transparent Bridging over DDR ExamplesComplex Transparent Bridging Network Topology Example Fast-Switched Transparent Bridging over Smds ExampleBC-78 Bridged Subnetworks with Domains BC-79BC-80 Configuration for Router aConfiguration for Router C Configuration for Router BConfiguration for Router D BC-81ATM Subscriber Ports, ATM Trunk Example Fast Ethernet Subscriber Port, Frame Relay Trunk ExampleBC-82 BC-83 BC-84 Configuration of IRB for PA-12E/2FE Port Adapter Example

BC-23 specifications

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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.