Cisco Systems BC-23 manual Configuring Transparent Bridging over Multiprotocol Lapb, BC-37

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Configuring Transparent Bridging

Transparent and SRT Bridging Configuration Task List

Bridging in a Frame Relay Network with No Multicasts

The Frame Relay bridging software uses the same spanning-tree algorithm as the other bridging functions, but allows packets to be encapsulated for transmission across a Frame Relay network. You specify IP-to-data-link connection identifier (DLCI) address mapping and the system maintains a table of both the Ethernet address and the DLCIs.

To configure bridging in a network that does not support a multicast facility, define the mapping between an address and the DLCI used to connect to the address. To bridge with no multicasts, use the following command in interface configuration mode:

Command

Purpose

 

 

frame-relay map bridge dlci broadcast

Defines the mapping between an address and the DLCI used to

 

connect to the address.

 

 

An example configuration is provided in the section “Frame Relay Transparent Bridging Examples” at the end of this chapter. Frame Relay is discussed in more detail in the “Configuring Frame Relay” chapter in the Cisco IOS Wide-Area Networking Configuration Guide.

Bridging in a Frame Relay Network with Multicasts

The multicast facility is used to learn about the other bridges on the network, eliminating the need for you to specify any mappings with the frame-relay map bridge broadcast command. An example configuration is provided in the section “Frame Relay Transparent Bridging Examples” at the end of the chapter for use as a configuration guide. Frame Relay is discussed in more detail in the “Configuring Frame Relay” chapter in the Cisco IOS Wide-Area Networking Configuration Guide.

Configuring Transparent Bridging over Multiprotocol LAPB

Cisco IOS software implements transparent bridging over multiprotocol Link Access Protocol-Balanced (LAPB) encapsulation on serial interfaces. To configure transparent bridging over multiprotocol LAPB, use the following commands beginning in global configuration mode:

 

Command

Purpose

Step 1

 

 

interface serial number

Specifies the serial interface.

Step 2

 

 

no ip address

Specifies no IP address to the interface.

Step 3

 

 

encapsulation lapb multi

Configures multiprotocol LAPB encapsulation.

Step 4

 

 

bridge-group bridge-group

Assigns the interface to a bridge group.

Step 5

 

 

bridge bridge-groupprotocol {ieee dec vlan-bridge}

Specifies the type of Spanning-Tree Protocol.

 

 

 

Note Transparent bridging over multiprotocol LAPB requires use of the encapsulation lapb multi command. You cannot use the encapsulation lapb protocol command with a bridge keyword to configure this feature.

For an example of configuring transparent bridging over multiprotocol LAPB, see the “Transparent Bridging over Multiprotocol LAPB Example” section on page 76”.

Cisco IOS Bridging and IBM Networking Configuration Guide

BC-37

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Contents BC-23 Transparent and SRT BridgingTransparent Bridging Features Integrated Routing and BridgingBC-24 BC-25 Bridge-Group Virtual InterfaceBridge-Group Virtual Interface in the Router BC-26SRT Bridging Features Other ConsiderationsBC-27 BC-28 Transparent and SRT Bridging Configuration Task ListBC-29 Configuring Transparent Bridging and SRT BridgingAssigning Each Network Interface to a Bridge Group As Ieee 802.1D standard, DEC or Vlan bridgeBC-30 Command PurposeTransparently Bridged VLANs for ISL Choosing the OUI for Ethernet Type II FramesTransparently Bridged VLANs on an Fddi Backbone BC-31BC-32 Routing between ISL VLANsBC-33 Specifies a subinterfaceSubinterface with the Vlan Same bridge groupBC-34 Configuring a Subscriber Bridge GroupConfiguring Transparent Bridging over WANs Configuring Fast-Switched Transparent Bridging over ATMSpecifying the Bridging Protocol Configuring Transparent Bridging over DDRCommand Defining the Protocols to BridgeFast-Switched Transparent Bridging Configuring Transparent Bridging over Frame RelayDetermining Access for Bridging Configuring an Interface for BridgingBC-37 Configuring Transparent Bridging over Multiprotocol LapbBridging in a Frame Relay Network with No Multicasts Bridging in a Frame Relay Network with MulticastsBC-38 Configuring Transparent Bridging over SmdsConfiguring Transparent Bridging over Specifies IP-to-X.121 mappingBC-39 Configuring Concurrent Routing and BridgingConfiguring Integrated Routing and Bridging Specifies a protocol to be routed on a bridge groupBC-40 Configuring InterfacesConfiguring the Bridge-Group Virtual Interface Enabling Integrated Routing and BridgingBC-41 Configuring Protocols for Routing or BridgingConfiguring 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 BC-45 Configuring Bridge Table Aging TimeFiltering Transparently Bridged Packets Forwarding Multicast AddressesBC-46 Setting Filters at the MAC LayerBC-47 Filters particular MAC-layer station addressesFiltering by Vendor Code Ethernet-ordered MAC addressFiltering by Protocol Type TypeBC-48 BC-49 Defining and Applying Extended Access ListsConfiguration mode InterfaceBC-50 Filtering LAT Service Announcements Enabling LAT Group Code Service FilteringBC-51 BC-52 Adjusting Spanning-Tree ParametersAssigning Path Costs Setting the Bridge PrioritySetting an Interface Priority Adjusting Bpdu IntervalsDefining the Maximum Idle Interval Adjusting the Interval between Hello BPDUsDefining the Forward Delay Interval Disabling the Spanning Tree on an InterfaceBC-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 GroupsBC-61 Configuring Constrained Multicast FloodingConfigures a transmission pause interval Distributes base load on the source MAC address onlyBC-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 One Router TwoBC-68 BC-69 Router ThreeRouting between VLANs Configuration Example Ethernet-to-FDDI Transparent Bridging ExampleBC-70 Ethernet Bridging Example Router/Bridge in BuildingBC-71 BC-72 SRT Bridging ExampleBC-73 Configuration for the New York City RouterConfiguration for the Thule, Greenland Router Multicast or Broadcast Packets Bridging ExampleConfiguration 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 BC-77 Transparent Bridging over DDR ExamplesFast-Switched Transparent Bridging over Smds Example Complex Transparent Bridging Network Topology ExampleBC-78 Bridged Subnetworks with Domains BC-79BC-80 Configuration for Router aBC-81 Configuration for Router BConfiguration for Router C Configuration for Router DFast Ethernet Subscriber Port, Frame Relay Trunk Example ATM Subscriber Ports, ATM 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.