Cisco SG250-18-K9 18 Port Networking Switch
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SG250-18-K9 Cisco 250 Series Managed L3 Switch 18 Ports Refurbished

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Part Number#: SG250-18-K9
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Short Description:
SG250-18-K9 250 Series Managed L3 Switch 16 Ethernet Ports & 2 Combo Gigabit Ethernet/Gigabit Small Form-Factor Pluggable (SFP) Ports | Made by Cisco | Refurbished
Product Condition:
Warranty provided by ALLHDD.COM:
90 Days

Advanced Network Management

Advanced network management of the SG250-18-K9 Cisco 250 Series 18-Ports SFP PoE+ Manageable Layer 3 Ethernet Switch allows for a wide range of features and functionalities that can be used to optimize and secure your network.

  • VLANs (Virtual LANs) can be configured to segment your network into different broadcast domains, providing improved security and reducing network congestion.
  • Quality of Service (QoS) can be configured to prioritize certain types of network traffic, such as real-time applications like VoIP or video conferencing, which require low-latency and high-bandwidth.
  • Access Control Lists (ACLs) can be used to restrict access to certain parts of the network based on IP address, protocol, and port number, providing an additional layer of security.
  • The switch also provides monitoring features like SNMP, RMON, and NetFlow, which can be used to keep track of network performance, troubleshoot issues, and identify potential security threats.
  • The switch can be configured and managed through a web interface or through the command-line interface (CLI) using Cisco's proprietary networking protocols like IOS and Cisco Discovery Protocol (CDP).
  • With the support of PoE+ it can supply power to devices such as IP phones, wireless access points and security cameras, reducing the need for external power sources and simplifying the deployment of these devices.

Power Over Ethernet (PoE+) Capabilities

The SG250-18-K9 Cisco 250 Series 18-Ports SFP PoE+ Manageable Layer 3 Ethernet Switch has Power over Ethernet (PoE+) capabilities, which allow it to supply power to devices such as IP phones, wireless access points, and security cameras over the same Ethernet cable that is used for data transmission. This eliminates the need for additional power sources and simplifies the deployment of these devices.

  • PoE+ Support: The switch supports the IEEE 802.3at standard for Power over Ethernet Plus (PoE+), which provides up to 30W of power per port. This allows the switch to power high-power devices such as Pan-Tilt-Zoom (PTZ) cameras, wireless access points, and IP phones.
  • Power Budget: The switch has a total power budget of 180W, allowing it to power multiple PoE+ devices simultaneously.
  • PoE Management: The switch has built-in PoE management features, such as the ability to set power thresholds and monitor power usage, which can help to optimize power usage and reduce energy costs.
  • PoE Scheduling: The switch has the capability to schedule PoE power on/off with the device that connected to the switch.

Features and Benefits

The SG250-18-K9 Cisco 250 Series 18-Ports SFP PoE+ Manageable Layer 3 Ethernet Switch has a range of features and benefits that can be used to optimize and secure your network, monitor and troubleshoot issues, and simplify the deployment of PoE+ devices.


  • 18 Gigabit Ethernet ports (16 PoE+ ports)
  • Support for Layer 3 routing protocols such as OSPF and RIP
  • Quality of Service (QoS) to prioritize network traffic
  • Access Control Lists (ACLs) for security
  • Virtual LANs (VLANs) for network segmentation
  • Support for Cisco FlexStack stacking and PoE+
  • SNMP, RMON, and NetFlow for monitoring and troubleshooting
  • IPv6 support for future-proofing the network
  • Benefits:

    • Scalable and high-performance design for growing networks and high-bandwidth applications
    • PoE+ support eliminates the need for additional power sources and simplifies the deployment of devices
    • Advanced network management features such as VLANs, QoS, and ACLs allow for improved security and optimized network performance
    • Support for Cisco FlexStack stacking increases the number of available ports and provides redundancy
    • Advanced monitoring and troubleshooting features like SNMP, RMON, and NetFlow make it easy to identify and resolve network issues.
    • IPv6 support ensures that the network will be able to handle future technologies and internet address space.

    General Information

    • Manufacturer Cisco
    • Manufacturer Part Number SG250-18-K9
    • Product Series 250
    • Product Model SG250-18
    • Product Name SG250-18 18-Port Gigabit Smart Switch
    • Product Type Ethernet Switch


    • Total Number of Network Ports 18
    • Uplink Port Yes
    • Port/Expansion Slot Details 18 x Gigabit Ethernet Network

    Media & Performance

    • Media Type Supported Twisted Pair
    • Ethernet Technology Gigabit Ethernet
    • Network Technology 1000Base-X

    Network & Communication

    • Layer Supported 2

    Management & Protocols

    • Manageable Yes

    Power Description

    • Power Source Power Supply
    • Redundant Power Supply Supported No


    • Package Contents-
    • SG250-18 18-Port Gigabit Smart Switch
    • Power Cord
    • Mounting Kit
    • Quick Start Guide

    About Refurbished Products

    Refurbished products are typically refurbished by an Original Manufacturer or an affiliate of the manufacturer or 3rd party facility. This product may have minor blemishes due to normal product usage and doesn't necessarily come with documentation and software unless indicated, but has been well tested and generally has never had any defects.

    Different Types of Switches

    Networking switches vary widely depending on the number of devices they can support, network bandwidth/speed, and form factor. Switches for small offices will have anything between 4 and 8 ports and can fit on a desk. For larger office network implementation, switches may have 24 ports, 48 ports, 96 ports, and 128 ports and are rack-mountable between 1U and 4U. Switches come in different types depending on the network speed and tasks they support. These include 40/100 Gbps, 10 Gigabit (up to 10000 Mbps), Gigabit Ethernet (up to 1000 Mbps), Power over Ethernet, and Fast Ethernet (10/100 Mbps).

    Unmanaged Switches

    The unmanaged switches offer fixed configurations on a plug-and-play basis. It is the most basic switch and there are a few choices in the market. These switches are affordable, but the basic features make them inappropriate for enterprise applications.

    Managed Switches

    The number of features and level of functionality improves with managed switches, making them ideal for enterprise and business applications. These switches are built with the command-line interface for ease of configuration. Equally, they support SNMP agents that come in handy when troubleshooting network issues.

    The security on managed switches is better and will protect different types of traffic. Other features include support for virtual LANs, IP routing, and quality of service settings. Managed switches are more expensive compared to all other types of switches.

    Smart Switches

    Smart switches refer to switches that possess more features than those unmanaged switches but do not have the full features of managed switches. Smart switches are more cost-effective than managed switches.

    Some of the limitations of the smart switches are a lack of telnet access support, Web GUIs, and a lack of many features for VLANs. They are affordable compared to a fully managed switch and are suitable for a smaller computer network.

    Modular Switches

    Modular switches allow the addition of expansion modules as the network expands. The expansion modules allow for more networked devices but are application-specific. They may include wireless access points, firewalls, or network analysis tools. The flexibility of a modular networking switch comes at a higher cost.


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    ALLHDD guarantees that the products will not have defects in material that will affect the product's functionality during the Standard Warranty Period. The warranty period starts when the merchandise/items from our warehouse.

    What does ALLHDD.Com warranty cover?

    30-days to 3 years warranty:

    Replacement or refund. In the case of material defects, we will try to replace the product first. The product will be replaced before the expiration of the original warranty. For any failure of hardware, if we cannot process the replacement of the product(s)/model(s), we will refund the original selling/invoiced price. The shipping costs and sales tax, if any, are non-refundable. ALLHDD retains the right to decide whether the item(s) will process for replacement or refund.

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    (c) damaged caused by other hardware or equipment. The warranty will void if the item is returned with physical damage, damage to the retail box, removed from the box, counterfeit labels/labelled by them, or any modifications of internal and external covers. Data loss or damages to any other equipment we do not cover by our offered warranty.

    What is the Manufacturer/Brand Warranty?

    In general, a manufacturer's warranty service/support is a written guarantee to the buyer of a product. Its terms assure the replacement or repair of the product, if necessary, within a specified period after the purchase (2-5 years depending on the brand/manufacturer). It is typically included in the price of the product. Products are brand new and sealed and the original manufacturer box is complete with the Manufacturer's genuine warranty. For most of the brand new/retail products that come with the manual and box, exceptions may apply (i.e., Cisco, Juniper Networks).

    For the server parts (i.e., Dell, HPE) to get Full coverage of the warranty server must have a full 3- 5 years warranty. However, ALLHDD.COM will cover the warranty duration if any Manufacturer doesn't support the advertised warranty and there is no refund for those.
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