Cisco core switch

Types of Cisco core switches

A cisco core switch refers to a type of switch that is positioned at the core layer of a network topology. The core switch is the center of the network, where all the data path connections converge. This type of switch is known for its capacity to handle large data flows and is critical for ensuring the security and availability of the network. Many models of core switches are offered by Cisco, which is a renowned company for providing networking solutions. The Cisco switches are differentiated based on their types and models, which include the following.

• Campus core switches: These types of core switches are positioned at the core of the network topology. They are responsible for combining the data from various distribution points within the network. The campus core switches also play a crucial role in routing the data to the different parts of the network. The Cisco core switch that fall under this category are known for their ability to provide high-speed data connectivity and are equipped with advanced features that support data security and redundancy.

• Multilayer switches: These types of switches are designed to offer both switching and routing functions. They are critical for enabling the network to function optimally. The multilayer switches are known for their capacity to route data packets between different subnets within the network. They also have the ability to switch the data packets within the same subnet. The multilayer switches come in handy in reducing the latency of the network by enabling the data to be routed at the hardware level.

• Chassis-based core switches: These types of core switches come with a modular design that enables them to be expanded based on the needs of the network. They are made up of a chassis that houses different modules. The chassis-based core switches are known for their capacity to offer high port density, which is crucial for large networks. They also come equipped with features such as virtualization, which enables the network to be divided into smaller segments.

Functions and Features of Cisco Core Switch

Core switches are the central point in a network. They are responsible for routing data between servers, storage devices, and other switches. The Cisco core switch provides many features and functions, such as VLAN support, redundancy, and quality of service.

• Virtual Local Area Network Support

VLAN support is a critical part of network segmentation. A Cisco 9600 series core switch supports up to 4000 VLANs, which allows network administrators to isolate traffic and secure sensitive information. The core switch can also assign unique VLAN identifiers to each frame, which makes network management easier.

• Redundancy

Core switches are a single point of failure in a network. If they go down, the entire network goes down. Cisco core switches come with multiple features that help prevent downtime and data loss. For instance, link aggregation and hot-swappable power supplies. Link aggregation enables network administrators to combine multiple network connections into a single logical link. So, if one link fails, the other links can still transmit data.

• Power Over Ethernet

Power over Ethernet is a technology that allows core switches to power IP phones, wireless access points, and other devices. This eliminates the need for additional power outlets and cables. PoE devices have intelligent power management, which allows network administrators to monitor and control power usage.

• Stacking Support

Stacking is a technology that allows multiple switches to operate as a single switch. A Cisco core switch can support up to 8 switches in a stack. Stacking reduces network complexity and management overhead. Network administrators can manage the entire switch stack as a single device.

• Quality of Service

Quality of service is a set of technologies that give priority to certain types of traffic, such as voice and video. Cisco core switches support several QoS mechanisms, including traffic shaping and class of service. These mechanisms help ensure that critical network applications receive the necessary bandwidth.

• Security Features

Cisco core switches come with numerous security features that help protect the network from malware and unauthorized access. For example, port security, which allows network administrators to limit the number of MAC addresses that can connect to a port. The core switch also supports 802.1x authentication, which requires all devices to authenticate before connecting to the network.

Scenarios of cisco core switch

• Large Enterprises:

Large corporations with sprawling networks across multiple locations typically deploy Cisco core switches at the center of their network infrastructure. These switches serve as the backbone to interconnect various distribution switches that, in turn, link to the numerous access switches found across different floors or buildings. By doing so, the Cisco core switch supports high-speed data transfer, thus ensuring seamless communication and collaboration among employees. This switch also enhances the overall network performance and reliability through features such as redundancy, link aggregation, and virtual LANs.

• Universities and Educational Institutions:

Universities and other educational facilities with large campuses and many users can use Cisco core switches to support a variety of networking requirements. These core switches provide the necessary connectivity to facilitate e-learning platforms, online resources, and collaboration tools for both students and staff. Also, these switches enable segmentation of the network to ensure different user groups, such as students, teachers, and administrators, have access to only authorized resources and services.

• Data Centers:

Within large data centers, especially those that have numerous servers, storage devices and other networking equipment, Cisco core switches can be used to form the foundation of a robust and high-performance network fabric. The switches provide low-latency, high-bandwidth connectivity between various servers and storage arrays, which allows for quick data transfer, efficient virtual server operations, and seamless resource sharing. Also, the core switches support advanced networking functionalities, such as network virtualization, which allows data center operators to create logical network segments and multi-tenant environments within a single physical network infrastructure.

• Hospitals and Healthcare Facilities:

In large medical centers, hospitals and other healthcare facilities with complex network environments, core Cisco switches can be deployed to provide the necessary network infrastructure for various critical applications and systems. These might include electronic health records (EHR) systems, picture archiving and communication systems (PACS), computerized physician order entry (CPOE) systems, and other healthcare information technology (HIT) applications. The switches support high-speed connectivity, as well as quality of service (QoS) mechanisms to ensure that real-time applications such as telemedicine and remote diagnostics are prioritized on the network.

How to Choose a Cisco Core Switch

When choosing a core switch for the network, it is important to consider the port density, bandwidth, modularity, and security features. The switch should support the number of ports required to connect all devices on the network. It should also provide enough bandwidth to handle the network's traffic. A modular switch allows for expansion and customization, while a fixed-configuration switch is more cost-effective and easier to manage. The switch should also include features to secure the network, such as access control lists, port security, and encryption.

When selecting a core switch, it is important to consider the type of switching fabric, which is either shared or distributed. The core switch should also support the required network protocols, such as Ethernet, TCP/IP, and routing protocols. The switch should also provide features for quality of service, such as prioritizing voice and video traffic. When choosing a switch, it is important to consider the management options, which include a command-line interface, web-based interface, and network management software. The switch should also support virtual LANs to segment the network and improve performance and security.

Cisco core switch Q & A

Q1: What is the purpose of a core switch?

A1: A core switch is used in a network to route data from one switch to another switch or device. It serves as the primary connection point for devices on a network that are not connected directly to it, such as servers and workstations (Core Switch, n.d.).

Q2: Is the core switch layer 2 or layer 3?

A2: In a two-tier architecture, the core switch is used as a Layer 2 switch. However, a Layer 3 switch can be used in a three-tier architecture. It offers the same capabilities as a router and enables the routing of IP traffic between VLANs, providing better performance and security.

Q3: Does the core switch need to be managed?

A3: Yes, the core switch needs to be managed. It allows the network administrators to monitor and configure the switch remotely. The core switch is equipped with features like SNMP, which enables the core switch to be monitored remotely.

Q4: Does the core switch provide power to devices connected to it?

A4: Yes, the core switch provides power to devices connected to it. It does so through Power over Ethernet (PoE) or PoE+ ports, which allows devices like IP phones, security cameras, and wireless access points to receive power and network connectivity from the switch. This eliminates the need for additional power outlets and simplifies the cabling infrastructure of the network.