Cisco Systems BC-23 manual Configuring Circuit Groups, BC-60

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Configuring Transparent Bridging

Tuning the Transparently Bridged Network

Note The VLAN Configuration WebTool hypertext link is listed in the router’s home page only when a PA-12E/2FE port adapter is installed in the router.

Tuning the Transparently Bridged Network

The following sections describe how to configure features that enhance network performance by reducing the number of packets that traverse the backbone network:

•Configuring Circuit Groups

•Configuring Constrained Multicast Flooding

Configuring Circuit Groups

In the process of loop elimination, the spanning-tree algorithm always blocks all but one of a group of parallel network segments between two bridges. When those segments are of limited bandwidth, it might be preferable to augment the aggregate bandwidth between two bridges by forwarding across multiple parallel network segments. Circuit groups can be used to group multiple parallel network segments between two bridges to distribute the load while still maintaining a loop-free spanning tree.

Deterministic load distribution distributes traffic between two bridges across multiple parallel network segments grouped together into a single circuit group. As long as one port of the circuit group is in the forwarding state, all ports in that circuit group will participate in load distribution regardless of their spanning-tree port states. This process guarantees that the computed spanning tree is still adaptive to any topology change and the load is distributed among the multiple segments. Deterministic load distribution guarantees packet ordering between source-destination pairs, and always forwards traffic for a source-destination pair on the same segment in a circuit group for a given circuit-group configuration.

Note You should configure all parallel network segments between two bridges into a single circuit group. Deterministic load distribution across a circuit group adjusts dynamically to the addition or deletion of network segments, and to interface state changes.

If a circuit-group port goes down and up as a result of configuration or a line protocol change, the spanning-tree algorithm will bypass port transition and will time out necessary timers to force the eligible circuit-group ports to enter the forwarding state. This avoids the long disruption time caused by spanning-tree topology recomputation and therefore resumes the load distribution as quickly as possible.

To tune the transparently bridged network, perform the following tasks:

1.Define a circuit group.

2.Optionally, configure a transmission pause interval.

3.Modify the load distribution strategy.

Cisco IOS Bridging and IBM Networking Configuration Guide

BC-60

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Contents Transparent and SRT Bridging BC-23BC-24 Transparent Bridging FeaturesIntegrated Routing and Bridging Bridge-Group Virtual Interface BC-25BC-26 Bridge-Group Virtual Interface in the RouterBC-27 SRT Bridging FeaturesOther Considerations Transparent and SRT Bridging Configuration Task List BC-28As Ieee 802.1D standard, DEC or Vlan bridge Configuring Transparent Bridging and SRT BridgingAssigning Each Network Interface to a Bridge Group BC-29Choosing the OUI for Ethernet Type II Frames Command PurposeTransparently Bridged VLANs for ISL BC-30BC-31 Transparently Bridged VLANs on an Fddi BackboneRouting between ISL VLANs BC-32Same bridge group Specifies a subinterfaceSubinterface with the Vlan BC-33Configuring Fast-Switched Transparent Bridging over ATM Configuring a Subscriber Bridge GroupConfiguring Transparent Bridging over WANs BC-34Defining the Protocols to Bridge Configuring Transparent Bridging over DDRCommand Specifying the Bridging ProtocolConfiguring an Interface for Bridging Configuring Transparent Bridging over Frame RelayDetermining Access for Bridging Fast-Switched Transparent BridgingBridging in a Frame Relay Network with Multicasts Configuring Transparent Bridging over Multiprotocol LapbBridging in a Frame Relay Network with No Multicasts BC-37Specifies IP-to-X.121 mapping Configuring Transparent Bridging over SmdsConfiguring Transparent Bridging over BC-38Specifies a protocol to be routed on a bridge group Configuring Concurrent Routing and BridgingConfiguring Integrated Routing and Bridging BC-39Enabling Integrated Routing and Bridging Configuring InterfacesConfiguring the Bridge-Group Virtual Interface BC-40Configuring Protocols for Routing or Bridging BC-41BC-42 Configuring Transparent Bridging OptionsDisabling IP Routing BC-43 Configuring LAT CompressionEnabling Autonomous Bridging BC-44 Establishing Multiple Spanning-Tree DomainsEstablishes a multiple spanning-tree domain Forwarding Multicast Addresses Configuring Bridge Table Aging TimeFiltering Transparently Bridged Packets BC-45Setting Filters at the MAC Layer BC-46Ethernet-ordered MAC address Filters particular MAC-layer station addressesFiltering by Vendor Code BC-47BC-48 Filtering by Protocol TypeType Interface Defining and Applying Extended Access ListsConfiguration mode BC-49BC-50 BC-51 Filtering LAT Service AnnouncementsEnabling LAT Group Code Service Filtering Adjusting Spanning-Tree Parameters BC-52Adjusting Bpdu Intervals Setting the Bridge PrioritySetting an Interface Priority Assigning Path CostsDisabling the Spanning Tree on an Interface Adjusting the Interval between Hello BPDUsDefining the Forward Delay Interval Defining the Maximum Idle IntervalBC-55 Configuring the PA-12E/2FE Port Adapter BC-56Monitoring and Maintaining the PA-12E/2FE Port Adapter BC-57BC-58 BC-59 Configuring Circuit Groups BC-60Distributes base load on the source MAC address only Configuring Constrained Multicast FloodingConfigures a transmission pause interval BC-61BC-62 Basic Bridging Example BC-63Concurrent Routing and Bridging Example BC-64Basic Integrated Routing and Bridging Example BC-65Complex Integrated Routing and Bridging Example BC-66Transparently Bridged VLANs Configuration Example BC-67BC-68 Router OneRouter Two Router Three BC-69BC-70 Routing between VLANs Configuration ExampleEthernet-to-FDDI Transparent Bridging Example BC-71 Ethernet Bridging ExampleRouter/Bridge in Building SRT Bridging Example BC-72Multicast or Broadcast Packets Bridging Example Configuration for the New York City RouterConfiguration for the Thule, Greenland Router BC-73BC-74 Configuration for BridgeTransparent Bridging Example BC-75 Frame Relay Transparent Bridging ExamplesBridging in a Frame Relay Network with No Multicasts BC-76 Transparent Bridging over Multiprotocol Lapb ExampleBridging in a Frame Relay Network with Multicasts Transparent Bridging over DDR Examples BC-77BC-78 Fast-Switched Transparent Bridging over Smds ExampleComplex Transparent Bridging Network Topology Example BC-79 Bridged Subnetworks with DomainsConfiguration for Router a BC-80Configuration for Router D Configuration for Router BConfiguration for Router C BC-81BC-82 Fast Ethernet Subscriber Port, Frame Relay Trunk ExampleATM Subscriber Ports, ATM Trunk Example BC-83 Configuration of IRB for PA-12E/2FE Port Adapter Example BC-84

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.

Security is a top priority, and the Cisco BC-23 incorporates cutting-edge security measures. Integrated threat detection and prevention systems help safeguard sensitive data from cyber threats. Additionally, the device supports secure access protocols, ensuring that only authorized users can connect to the network. This multi-layered security approach not only protects the network infrastructure but also secures the integrity of the data being transmitted.

Another significant characteristic of the BC-23 is its support for software-defined networking (SDN). This technology allows businesses to manage their networks through centralized software applications, facilitating real-time adjustments and optimizations. The flexibility afforded by SDN is especially advantageous in dynamic environments where network demands can shift rapidly.

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.

Furthermore, the BC-23 is designed for scalability. As organizations grow, their networking needs evolve, and the BC-23 can easily adapt to these changes. Businesses can add additional devices and capabilities without the need for a complete overhaul of their existing infrastructure.

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.
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