Cisco StackPower Topology

A maximum of 8400W is possible in a pool of power in a stack of four switches loaded with two 1100W power supplies each. Obviously, it is excessive; even if the stack consists of four Catalysts 3750-X-48P switches requiring full PoE+. Let’s do the math:

4 switches x 48 ports x 30W = 5760W: a lot less than the available 8400W

If only one power supply is installed in each switch, we get 4200W in the power pool. Now we fall short, but the reality is that not everyone needs full PoE+ on every port in a stack of four switches; hence, 4200W may be just fine. Here is where the Cisco StackPower feature starts to provide savings by allowing the administrator to purchase power supplies as the need for power grows.

The Cisco StackPower technology can be deployed in a ring topology as well as in a star topology over an XPS, as shown earlier in Figures 4 and 5. Both topologies have advantages; a ring topology provides greater resiliency, since current can flow in either direction in the ring in case of a path failure. On the other hand, the number of switches sharing power is restricted to four. To ensure safety and prevent large currents through the cables, the number of switches in a power stack is limited to four; some deployment scenarios create large currents that would require a larger gauge wire in the StackPower cables which reduces the manageability of the cables. Nonetheless, a stack of four is a common deployment.

In a star topology, there is no such restriction; all nine switches can share power through the XPS, although one more piece of hardware is installed in the rack among the switches.

eXpandable Power System (XPS 2200)

The XPS 2200 is the next-generation power redundant system, providing redundancy for up to nine Cisco Catalyst 3560-X Series Switches as well as Cisco StackPower capability to up to nine Catalyst 3750-X switches.

Modes of Operation

Cisco StackPower technology has three modes of operation, which offer new capabilities as well as the classical RPS functionality without the RPS device. The three modes of operation are:

Power-sharing mode, strict and non-strict (loose)

Redundant mode, strict and non-strict (loose)

RPS mode (requires an XPS 2200)

Power-Sharing Mode (Non-strict or loose)

The default configuration is power-sharing mode non-strict. Of course, you have the option of configuring strict mode, which would keep you from creating a negative power budget. The same is true for redundant mode.

Power sharing mode is the core of StackPower and is the simplest (Figure 8). The power gets allocated from the power pool as power requests come in from the switches and PoE devices (IP phones, wireless access points, and so on). The power stack keeps track of the power budget and allocated power count and continues to allocate new power until the power budget is completely depleted. By default, this mode does not have any restrictions and will allocate all the power available in the power budget.

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STACKT150CM specifications

The Cisco Systems STACKT150CM is an advanced technology solution designed to meet the diverse networking needs of modern businesses. This system, part of Cisco's extensive product line, highlights the company's commitment to delivering reliable and high-performance networking equipment.

One of the main features of the STACKT150CM is its flexibility in deployment. The unit can be integrated into a variety of network architectures, supporting both enterprise and small business environments. Its modular design allows for efficient scalability, enabling organizations to expand their network capacity as their needs grow. This adaptability makes the device suitable for both existing networks and new setups.

In terms of performance, the STACKT150CM is equipped with high-speed switching capabilities. It operates at impressive speeds, ensuring minimal latency and reinforced reliability in data transmission. This is essential for businesses that rely on real-time data processing and communication. The device supports various protocols, enhancing its compatibility with a wide array of devices and applications within an organization’s infrastructure.

Security features are a significant focus in the design of the STACKT150CM. It incorporates advanced security measures to protect against unauthorized access and cyber threats. This includes built-in firewall capabilities and support for network segmentation, which helps isolate critical data and applications from potential vulnerabilities. With the increasing prevalence of cyberattacks, these features are essential for safeguarding sensitive information.

The STACKT150CM also leverages Cisco's innovative software-defined networking technologies, which provide enhanced control and automation capabilities. Administrators can manage the network more efficiently, allowing for quicker adjustments and responses to changing network demands. This is critical in today’s fast-paced business environment, where operational flexibility and responsiveness are paramount.

Additionally, the device boasts robust energy efficiency features. Its design minimizes power consumption without compromising performance, aligning with the growing emphasis on sustainability in technology. This not only reduces operational costs but also positions organizations as socially responsible entities.

In conclusion, the Cisco Systems STACKT150CM represents a powerful offering in network solutions, combining flexibility, security, performance, and efficiency. It is an ideal choice for businesses looking to enhance their network infrastructure while preparing for future growth and technological advancements.