Configuring Transparent Bridging

Transparent and SRT Bridging Configuration Task List

forwarding decision and only switch the traffic to local interfaces configured as belonging to the same VLAN broadcast domain. Router A provides an inter-VLAN mechanism that lets Router A function as a gateway for stations on a given LAN segment by transmitting VLAN encapsulated traffic to and from other switched VLAN domains or simply transmitting traffic in native (non-VLAN) format.

Figure 10 Inter-VLAN Connectivity between Multiple Switching Platforms

1

VLAN100

 

 

802.10 FDDI VLAN

 

 

 

 

VLAN100

1

VLAN200

 

VLAN200

2

 

 

 

 

 

 

2

 

 

 

 

 

 

3 VLAN300

 

 

Backbone

 

 

 

 

VLAN300 3

 

 

 

 

 

 

 

Catalyst 1200A

 

Catalyst 1200B

 

 

 

 

 

1/1

 

 

 

 

 

 

Router A

Wide area link

2/1 3/1

100BT ISL

ProStack

100BT ISL

VLAN400

VLAN600

VLAN400 VLAN500 VLAN400 VLAN500

Mainframe

S3902

Figure 10 illustrates the following scenarios:

Clients on VLAN 300 want to establish sessions with a server attached to a port in a different VLAN (600). In this scenario, packets originating on LAN interface 3 of the Catalyst 1200B switch are tagged with an 802.10 header with a security association identifier of 300 as they are forwarded onto the FDDI ring. Router A can accept these packets because it is configured to route VLAN 300, classify and make a layer 3 forwarding decision based on the destination network address and the route out (in this case Fast Ethernet 3/1), and adding the ISL VLAN header (color 200) appropriate to the destination subnet as the traffic is switched.

There is a network requirement to bridge two VLANs together through the system rather than selectively route certain protocols. In this scenario the two VLAN IDs are placed in the same bridge group. Note that they form a single broadcast domain and spanning tree, effectively forming a single VLAN.

See the “Routing between VLANs Configuration Example” section on page 70 for an example configuration of the topology shown in Figure 10.

To configure bridging between VLANs, enter the following commands, beginning in interface configuration mode:

 

Command

Purpose

Step 1

 

 

interface type

Specifies a subinterface.

 

slot/port.subinterface-number

 

Step 2

 

 

encapsulation {sde isl} domain

Specifies the encapsulation type (either ISL or SDE) and associates the

 

 

subinterface with the VLAN.

Step 3

 

 

bridge-group bridge-group

Enables bridged traffic between the subinterface and other interfaces in

 

 

the same bridge group.

 

 

 

Cisco IOS Bridging and IBM Networking Configuration Guide

BC-33

Page 11
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Cisco Systems BC-23 manual Specifies a subinterface, Subinterface with the Vlan, Same bridge group, BC-33

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.

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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.

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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.