Chapter 2 Installation

Creating Connections

Cascaded Stack Connections with a Redundant Link

You can form a redundant link by connecting the open ports on the top and bottom GigaStack GBICs within the same stack, as shown in Figure 2-8.

Figure 2-8 Cascaded Stack Connections with a Redundant Link

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The GigaStack GBIC software detects the loop configuration by the way the cables are connected and the number of switches used in the stack. The software uses one of the GigaStack GBIC links as the redundant link, which is disabled for data transmission while all the other links in the stack are up. When any other link in the stack is down, the redundant link is automatically enabled for data transmission. To ensure continued connectivity, the software periodically checks for changes in the stack and invokes the loop detection algorithm if a new link is added to the cascaded stack or if a link is removed from the cascaded stack.

GigaStack GBICs installed in a stack support a loop configuration only if every Catalyst 2900 XL and 3500 XL switch in the stack is running IOS software Release 12.0(5)XU or later, Release 12.1(6)EA2 or later for Catalyst 2950 switches, and Release 12.1(4)EA1 or later for Catalyst 3550 switches.

For Catalyst 2900 XL and 3500 XL switches running IOS software earlier than Release 12.0(5)XU, an illegal loop is created under these conditions:

A GigaStack GBIC is connected to two other GBIC ports in the same stack.

A single GigaStack GBIC cable is inserted in port 1 and port 2 of the same GBIC.

 

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Cisco Systems WS-X3500-XL manual Catalyst 3512 XL Catalyst 3524 XL

WS-X3500-XL specifications

Cisco Systems has long been a leader in networking technology, and one of its robust offerings is the WS-X3500-XL line card. This high-performance module is designed for the Catalyst 3500 series switches, providing enhanced functionality and flexibility for enterprise networking environments.

The WS-X3500-XL boasts several main features that make it a valuable addition to any network. Firstly, it supports a variety of Fast Ethernet options, which allows organizations to run 10/100 Mbps connections. Its versatility in port configurations ensures that businesses can tailor their networks according to specific requirements without needing to invest in multiple hardware components.

Another hallmark of the WS-X3500-XL is its support for Cisco's patented features, such as VLANs (Virtual Local Area Networks) and QoS (Quality of Service). VLANs enable the segmentation of a network into distinct broadcast domains, enhancing security and improving traffic management. This capability is particularly important in larger environments where different departments may require their own isolated network segments.

In terms of technology, the WS-X3500-XL is equipped with support for advanced routing protocols such as RIP, OSPF, and EIGRP, making it suitable for both Layer 2 and Layer 3 networking scenarios. This adaptability allows organizations to optimize their routing processes and make efficient use of bandwidth.

Performance-wise, the WS-X3500-XL includes features like fast switching and multicasting capabilities for improved network efficiency. With its built-in forwarding engine, this line card ensures rapid packet processing, which is crucial for maintaining high performance in busy network environments.

The WS-X3500-XL also emphasizes redundancy and failover capabilities, which are vital for maintaining network uptime. It supports features like Spanning Tree Protocol (STP) for loop prevention, ensuring that the network remains stable and functional even in the event of a device failure.

In conclusion, the Cisco WS-X3500-XL line card stands out in the realm of networking equipment thanks to its versatility, robust feature set, and advanced technologies. Whether used in small to medium-sized businesses or larger enterprise networks, it provides the flexibility and performance required to meet modern networking demands. Its compatibility with a range of Cisco's technologies ensures a future-proof solution for evolving networking needs.