Configuring Transparent Bridging

Transparent and SRT Bridging Configuration Task List

Configuring Transparent Bridging over SMDS

We support fast-switched transparent bridging for Switched Multimegabit Data Service (SMDS) encapsulated serial and HSSI networks. Standard bridging commands are used to enable bridging on an SMDS interface.

To enable transparent bridging over SMDS, use the following commands beginning in global configuration mode:

 

Command

Purpose

Step 1

 

 

interface serial number

Specifies the serial interface.

Step 2

 

 

encapsulation smds

Configures SMDS encapsulation on the serial interface.

Step 3

 

 

bridge-group bridge-group

Associates the interface with a bridge group.

Step 4

 

 

smds multicast bridge smds-address

Enables transparent bridging of packets across an SMDS network.

 

 

 

Broadcast Address Resolution Protocol (ARP) packets are treated differently in transparent bridging over an SMDS network than in other encapsulation methods. For SMDS, two packets are sent to the multicast address. One is sent using a standard (SMDS) ARP encapsulation; the other is sent with the ARP packet encapsulated in an 802.3 MAC header. The native ARP is sent as a regular ARP broadcast.

Our implementation of IEEE 802.6i transparent bridging for SMDS supports 802.3, 802.5, and FDDI frame formats. The router can accept frames with or without frame check sequence (FCS). Fast-switched transparent bridging is the default and is not configurable. If a packet cannot be fast switched, it is process switched.

An example configuration is provided in the section “Fast-Switched Transparent Bridging over SMDS Example” later in this chapter. For more information on SMDS, refer to the “Configuring SMDS” chapter in the Cisco IOS Wide-Area Networking Configuration Guide.

Configuring Transparent Bridging over X.25

The transparent bridging software supports bridging of packets in X.25 frames. This ability is useful for such tasks as transmitting packets from proprietary protocols across an X.25 network.

The X.25 bridging software uses the same spanning-tree algorithm as the other bridging functions, but allows packets to be encapsulated in X.25 frames and transmitted across X.25 media. You specify the IP-to-X.121 address mapping, and the system maintains a table of both the Ethernet and X.121 addresses. To configure X.25 transparent bridging, use the following command in interface configuration mode:

Command

Purpose

 

 

x25 map bridge x.121-addressbroadcast

Specifies IP-to-X.121 mapping.

[options-keywords]

 

 

 

For more information about configuring X.25, refer to the “Configuring X.25 and LAPB” chapter in the Cisco IOS Wide-Area Networking Configuration Guide.

Cisco IOS Bridging and IBM Networking Configuration Guide

BC-38

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Cisco Systems BC-23 manual Configuring Transparent Bridging over Smds, Specifies IP-to-X.121 mapping, BC-38

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.