Cisco BC-23 - Manual

Cisco BC-23

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Table of Contents:

  • Page 2 – Transparent Bridging Features; Provides both bridging and routing of VLANs.; Integrated Routing and Bridging
  • Page 3 – Switch packets from a bridged interface to a routed interface; Bridge-Group Virtual Interface
  • Page 4 – Note
  • Page 5 – Other Considerations; SRT Bridging Features; As with other media, all the features that use
  • Page 6 – Caution; Transparent and SRT Bridging Configuration Task List
  • Page 7 – Configuring Transparent Bridging and SRT Bridging; Assigning Each Network Interface to a Bridge Group; Command
  • Page 8 – Choosing the OUI for Ethernet Type II Frames; Transparently Bridged VLANs for ISL; Assigns a network interface to a bridge group.; Selects the Ethernet Type II OUI encapsulation code.
  • Page 9 – security association identifier
  • Page 10 – Routing between ISL VLANs; Exchange; Specifies a subinterface.; Associates the subinterface with an existing bridge group.
  • Page 11 – Figure 10 illustrates the following scenarios:
  • Page 12 – Configuring a Subscriber Bridge Group; Configuring Transparent Bridging over WANs; Configuring Fast-Switched Transparent Bridging over ATM
  • Page 13 – Cisco IOS; Configuring Transparent Bridging over DDR; Defining the Protocols to Bridge; Command Purpose
  • Page 14 – Determining Access for Bridging; Configuring Transparent Bridging over Frame Relay; Fast-Switched Transparent Bridging; Defines a dialer list for the specified access list.; Assigns the specified interface to a bridge group.
  • Page 15 – Bridging in a Frame Relay Network with No Multicasts; Configuring Transparent Bridging over Multiprotocol LAPB
  • Page 16 – Configuring Transparent Bridging over SMDS; Configuring Transparent Bridging over X.25; Cisco IOS Wide-Area Networking Configuration Guide; Specifies the serial interface.; Configures SMDS encapsulation on the serial interface.; Enables transparent bridging of packets across an SMDS network.
  • Page 17 – Configuring Concurrent Routing and Bridging; Configuring Integrated Routing and Bridging
  • Page 18 – Configuring Interfaces; Use the; show interfaces irb; Configuring the Bridge-Group Virtual Interface; Specifies concentrator port operation.
  • Page 19 – Configuring Protocols for Routing or Bridging; Enables a bridge-group virtual interface.; Specifies a protocol to be routed in a bridge group.; Specifies that a protocol is not to be routed in a bridge group.; Specifies that a protocol is to be bridged in the bridge group.; Specifies that a protocol is not to be bridged in the bridge group.
  • Page 20 – Configuring Transparent Bridging Options; Disabling IP Routing
  • Page 21 – Enabling Autonomous Bridging; MEC; Configuring LAT Compression; Enables autonomous bridging (if using the ciscoBus2 controller).
  • Page 22 – Establishing Multiple Spanning-Tree Domains; Establishes a multiple spanning-tree domain.
  • Page 23 – Preventing the Forwarding of Dynamically Determined Stations; aging time; Filtering Transparently Bridged Packets; Allows the forwarding of frames with multicast source addresses.; Sets the bridge table aging time.
  • Page 24 – Setting Filters at the MAC Layer
  • Page 25 – Filtering by Specific MAC Address; Filtering by Vendor Code
  • Page 26 – Filtering by Protocol Type
  • Page 27 – Defining and Applying Extended Access Lists
  • Page 28 – end
  • Page 29 – Filtering LAT Service Announcements
  • Page 30 – Adjusting Spanning-Tree Parameters
  • Page 31 – Setting the Bridge Priority; Cisco; Adjusting BPDU Intervals
  • Page 32 – Disabling the Spanning Tree on an Interface; When a; Specifies the interval between hello BPDUs.; Sets the default of the forward delay interval.; Disables the spanning tree on an interface.
  • Page 33 – show interfaces
  • Page 34 – show version
  • Page 35 – Monitoring and Maintaining the PA-12E/2FE Port Adapter
  • Page 36 – Cisco IOS Configuration Fundamentals
  • Page 38 – Tuning the Transparently Bridged Network; Configuring Circuit Groups
  • Page 39 – Configuring Constrained Multicast Flooding; Adds a serial interface to a circuit group.; Configures a transmission pause interval.; Distributes base load on the source MAC address only.
  • Page 40 – Monitoring and Maintaining the Transparent Bridge Network
  • Page 41 – Basic Bridging Example
  • Page 42 – The configuration file for the router in Figure 12 is as follows:; Concurrent Routing and Bridging Example
  • Page 43 – Basic Integrated Routing and Bridging Example
  • Page 45 – Transparently Bridged VLANs Configuration Example
  • Page 46 – Router One
  • Page 47 – Router Three
  • Page 48 – Routing between VLANs Configuration Example
  • Page 49 – Ethernet Bridging Example; Router/Bridge in Building 1
  • Page 50 – Router/Bridge in Building 2; SRT Bridging Example; If there were source-routed traffic to bridge, the
  • Page 51 – Configuration for the New York City Router; Multicast or Broadcast Packets Bridging Example
  • Page 52 – The correct access list would be as follows:; X.25 Transparent Bridging Example; Configuration for Bridge 1
  • Page 53 – Configuration for Bridge 3; Frame Relay Transparent Bridging Examples
  • Page 54 – Bridging in a Frame Relay Network with Multicasts; Transparent Bridging over Multiprotocol LAPB Example
  • Page 55 – Fast-Switched Transparent Bridging over ATM Example (Cisco 7000); and a; dialer list protocol list; command that refers to the specified access list.
  • Page 56 – Fast-Switched Transparent Bridging over SMDS Example; Complex Transparent Bridging Network Topology Example
  • Page 58 – show span; Configuration for Router A
  • Page 59 – Configuration for Router B
  • Page 60 – Fast Ethernet Subscriber Port, Frame Relay Trunk Example; ATM Subscriber Ports, ATM Trunk Example
  • Page 61 – command is used to configure each interface for cut-through
  • Page 62 – Configuration of IRB for PA-12E/2FE Port Adapter Example
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BC-23

Cisco IOS Bridging and IBM Networking Configuration Guide

Configuring Transparent Bridging

The Cisco IOS software bridging functionality combines the advantages of a spanning-tree bridge and a
full multiprotocol router. This combination provides the speed and protocol transparency of an adaptive
spanning-tree bridge, along with the functionality, reliability, and security of a router.

This chapter describes how to configure transparent bridging and source-route transparent (SRT)
bridging. This chapter also describes the concepts of virtual networking, transparent bridging of virtual
LANs (VLANs), and routing between VLANs. For a complete description of the transparent bridging
commands mentioned in this chapter, refer to the “Transparent Bridging Commands” chapter in the

Cisco IOS Bridging and IBM Networking Command Reference, Volume I.

To locate documentation of

other commands that appear in this chapter, use the command reference master index or search online.

This chapter contains the following sections:

•

Technology Overview, page 23

•

Transparent and SRT Bridging Configuration Task List, page 28

•

Tuning the Transparently Bridged Network, page 60

•

Monitoring and Maintaining the Transparent Bridge Network, page 62

•

Transparent and SRT Bridging Configuration Examples, page 62

Technology Overview

The following sections provide an overview of transparent bridging in the Cisco IOS software:

•

Transparent and SRT Bridging, page 23

•

Transparent Bridging Features, page 24

•

Integrated Routing and Bridging, page 24

•

SRT Bridging Features, page 27

Transparent and SRT Bridging

Cisco IOS software supports transparent bridging for Ethernet, Fiber Distributed Data Interface (FDDI),
and serial media, and supports source-route transparent (SRT) bridging for Token Ring media. In
addition, Cisco supports all the mandatory Management Information Base (MIB) variables specified for
transparent bridging in RFC 1286.

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Summary

Page 2 - Transparent Bridging Features; Provides both bridging and routing of VLANs.; Integrated Routing and Bridging

Configuring Transparent Bridging Technology Overview BC-24 Cisco IOS Bridging and IBM Networking Configuration Guide Transparent Bridging Features Cisco’s transparent bridging software implementation has the following features: • Complies with the IEEE 802.1D standard. • Provides the ability to logi...

Page 3 - Switch packets from a bridged interface to a routed interface; Bridge-Group Virtual Interface

Configuring Transparent Bridging Technology Overview BC-25 Cisco IOS Bridging and IBM Networking Configuration Guide Integrated routing and bridging makes it possible to route a specific protocol between routed interfaces and bridge groups, or route a specific protocol between bridge groups. Local o...

Page 4 - Note

Configuring Transparent Bridging Technology Overview BC-26 Cisco IOS Bridging and IBM Networking Configuration Guide Figure 8 Bridge-Group Virtual Interface in the Router The bridge-group virtual interface is a normal routed interface that does not support bridging, but does represent its correspond...

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