Cisco SF250-48-K9-NA 48-Port Fast Ethernet Smart Switch


Add more switching capacity to your corporate network with the SF250-48 48-Port Fast Ethernet Smart Switch from Cisco. This switch comes equipped with 48 10/100 Mb/s Ethernet ports, a pair of 10/100/1000 Mb/s RJ45/SFP combo ports, and two SFP ports, while a USB Type-A port allows for image and configuration transfers.

Powered by an 800 MHz ARM processor with 512 MB of RAM and 256 MB of flash memory, the SF250-48 Smart Switch boasts network security features such as 802.11x user authentication, denial-of-service attack prevention, and access control lists. The SF250-48's support for the Energy Efficient Ethernet standard allows the switch to conserve power during periods of low data traffic.

Web User Interface
Built-in switch configuration utility for easy browser-based device configuration (HTTP/HTTPS). Supports configuration, wizards, system dashboard, system maintenance, and monitoring. Basic and advanced mode.
Smart Network Application (SNA)
A network-level monitoring and management tool, SNA can discover network topology, display link status, monitor events, apply configurations, and upgrade software images across multiple switches in the network.
Support for versions 1, 2c, 3, traps, and SNMP v3 User-based Security Model (USM).
FindIT Network Manager and Probe
Designed to manage select Cisco switches, routers, and wireless access points, the FindIT Network Manager and Probe let you proactively manage the network, eliminating the need to set up a separate hardware or virtual machine on site.
FindIT Network Discovery Utility
Accessible through a simple toolbar on the user's web browser, the FindIT Network Discovery Utility lets you discover Cisco devices on the network and find basic device information, inventory, and firmware updates.
Cisco Smartports Technology
A feature that facilitates zero-touch deployments, Smartports technology automatically configures ports with specific levels of security, QoS, and availability according to the type of connected device, based on Cisco best practices and pretested configurations. The Auto Smartports feature automatically applies the intelligence delivered through the Smartports roles to the port based on the device types discovered over Cisco Discovery Protocol or Link Layer Discovery Protocol-Media Endpoint Discovery (LLDP-MED).
Remote monitoring (RMON)
Embedded RMON software agent supports 4 RMON groups (history, statistics, alarms, and events) for enhanced traffic management, monitoring, and analysis.
IPv4 and IPv6 Dual Stack
Coexistence of both protocol stacks to ease migration.
Firmware Upgrade
Web browser upgrade (HTTP/HTTPS) and TFTP and upgrade over SCP running over SSH. Dual images for resilient firmware upgrades.
Port Mirroring
Traffic on a port can be mirrored to another port for analysis with a network analyzer or RMON probe. Up to 4 source ports can be mirrored to one destination port.
VLAN Mirroring
Traffic from a VLAN can be mirrored to a port for analysis with a network analyzer or RMON probe. Up to 4 source VLANs can be mirrored to one destination port.
Dynamic Host Configuration Protocol (DHCP)
DHCP options facilitate tighter control from a central point (DHCP server), to obtain IP address, autoconfiguration (with configuration file download), DHCP Relay, and host name.
Secure Copy (SCP)
Securely transfers files to and from the switch.
Autoconfiguration with SCP File Download
Enables mass deployment with protection of sensitive data.
Text-Editable Configs
Config files can be edited with a text editor and downloaded to another switch, facilitating easier mass deployment.
Textview Command-Line Interface (CLI)
Scriptable CLI. A full CLI as well as a menu-based CLI is supported. User privilege levels 1, 7, and 15 are supported for the CLI.
Cisco Network Plug and Play (PnP) Agent
Provides a simple, secure, unified, and integrated tool to aid new branch or campus device rollouts or for provisioning updates to an existing network. The solution provides a unified approach to provision Cisco routers, switches, and wireless devices with a near-zero-touch deployment experience.
Localization of GUI and documentation into multiple languages.
Login Banner
Configurable multiple banners for web as well as CLI.
Additional Management Features
Traceroute; single IP management; HTTP/HTTPS; RADIUS; port mirroring; TFTP upgrade; DHCP client; Simple Network Time Protocol (SNTP); cable diagnostics; Ping; syslog; Telnet client (SSH secure support); automatic time settings from Management Station.
IP Telephony Support
The SF250-48's QoS features prioritize delay-sensitive services such as voice and video, simplifying unified communications deployments while helping to ensure consistent network performance.
Link Layer Discovery Protocol with LLDP-MED Extensions
Allows the switch to advertise its identification, configuration, and capabilities to neighboring devices that store the data in a MIB (Management Information Base). Link Layer Discovery Protocol-Media Endpoint Discovery (LLDP-MED) is an enhancement to LLDP that adds the extensions needed for IP phones.
Networkwide Automatic Voice Deployment
Using a combination of Cisco Discovery Protocol, LLDP-MED, Auto Smartports, and Voice Services Discovery Protocol (VSDP, a patented Cisco protocol), users can deploy an end-to-end voice network dynamically. The switches in the network automatically converge into a single voice VLAN and set of QoS parameters and then propagate them out to the phones on the ports where they are discovered. For example, automated voice VLAN capabilities let you plug any IP phone (including third-party phones) into your IP telephony network and receive an immediate dial tone. The switch automatically configures the device with the right VLAN and QoS parameters to prioritize voice traffic.
Energy-Saving Features
Energy Detect
Automatically turns power off on RJ-45 port when detecting link down. Active mode is resumed without loss of any packets when the switch detects the link is up.
Cable Length Detection
Adjusts the signal strength based on the cable length. Reduces power consumption for shorter cables.
Energy Efficient Ethernet
Supports IEEE 802.3az on all copper Gigabit Ethernet ports.
Manually Controlled LEDs
LEDs can be manually turned off to conserve power.
Time-Based Port Operation
Link up or down based on user-defined schedule (when the port is administratively up).
Time-based PoE
On PoE-capable models, PoE power can be on or off based on user-defined schedule to save energy.
Layer 2 Switching
Spanning Tree Protocol (STP)
Standard 802.1d spanning tree support. Fast convergence using 802.1w (Rapid Spanning Tree Protocol), enabled by default. Multiple spanning tree instances using 802.1s (MSTP), with up to 8 instances supported.
Port Grouping/Link Aggregation
Support for IEEE 802.3ad Link Aggregation Control Protocol (LACP). Up to 4 groups supported with up to 8 ports per group with 16 candidate ports for each (dynamic) 802.3ad LAG.
VLAN Support
Capable of handling up to 256 active VLANs simultaneously. Support for port-based and 802.1Q tag-based VLANs, management VLAN, and guest VLAN.
Voice VLAN
Voice traffic is automatically assigned to a voice-specific VLAN and treated with appropriate levels of QoS. Auto-voice capabilities deliver network-wide zero-touch deployment of voice endpoints and call control devices.
GVRP and GARP Support
Generic VLAN Registration and Generic Attribute Registration protocols for automatically propagating and configuring VLANs in a bridged domain.
IGMP Snooping
Internet Group Management Protocol (IGMP) limits bandwidth-intensive multicast traffic to only the requesters. Supports 4K multicast groups; source-specific multicasting is also supported.
IGMP Querier
Used to support a Layer 2 multicast domain of snooping switches in the absence of a multicast router.
Loopback Detection
Provides protection against loops by transmitting loop protocol packets out of ports on which loop protection has been enabled. It operates independently of STP.
Layer 3
Layer 3 Static Routing
Allows you to segment your network into separate workgroups and communicate across VLANs without degrading application performance. As a result, you can manage internal routing with your switches and dedicate your router to external traffic and security, helping your network run more efficiently.
Layer 3 Routing Features
  • Wire-speed routing of IPv4 packets; up to 32 static routes and up to 16 IP interfaces.
  • Wire-speed routing of IPv6 packets.
  • Configuration of Layer 3 interface on physical port, LAG, VLAN interface, or loopback interface
  • Support for Classless Interdomain Routing (CIDR).
  • Relay of DHCP traffic across IP domains.
  • User Datagram Protocol (UDP) relay: Relay of broadcast information across Layer 3 domains for application discovery or relaying of bootP/DHCP packets.
  • Security
    Main Security Features
    IEEE 802.1X port security controls access to your network, denial-of-service (DoS) attack prevention helps to increase network uptime during an attack, and Access Control Lists (ACLs) help protect sensitive portions of the network from unauthorized users.
    Secure Sockets Layer (SSL)
    Encrypts all HTTPS traffic, allowing secure access to the browser-based management GUI in the switch.
    Secure Shell (SSH) Protocol
    A secure replacement for Telnet traffic. Secure Copy (SCP) also uses SSH. Both SSH v1 and v2 are supported.
    IEEE 802.1X (Authenticator Role)
    RADIUS authentication, guest VLAN, single/multiple host mode, and single/multiple sessions.
    Secure Core Technology (SCT)
    Ensures that the switch will receive and process management and protocol traffic no matter how much traffic is received.
    Secure Sensitive Data (SSD)
    A mechanism to manage sensitive data (such as passwords, keys, and so on) securely on the switch, populating this data to other devices, and secure autoconfig. Access to view the sensitive data as plain text or encrypted is provided according to the user-configured access level and the access method of the user.
    Port Security
    Ability to lock source MAC addresses to ports and limit the number of learned MAC addresses.
    RADIUS Authentication
    Supports RADIUS authentication for management access. Switch functions as a client.
    Storm Control
    Supports broadcast, multicast, and unknown unicast.
    Access Control Lists (ACLs)
    Support for up to 512 rules. Drop or rate limit based on source and destination MAC, VLAN ID or IP address, protocol, port, differentiated services code point (DSCP)/IP precedence, TCP/UDP source and destination ports, 802.1p priority, Ethernet type, Internet Control Message Protocol (ICMP) packets, IGMP packets, or TCP flag.
    STP Loopback Guard
    Provides additional protection against Layer 2 forwarding loops (STP loops).
    Quality of Service
    Strict priority and Weighted Round-Robin (WRR) queue assignment based on DSCP and class of service (802.1p/CoS).
    Class of Service
  • Port-based
  • 802.1p VLAN priority-based
  • IPv4/v6 IP precedence/Type of Service (ToS)/DSCP-based
  • Differentiated Services (DiffServ)
  • Classification and re-marking ACLs, trusted QoS
  • Rate Limiting
  • Ingress policer
  • Egress shaping and rate control
  • Per VLAN, per port, and flow-based
  • Congestion Avoidance
    A TCP congestion avoidance algorithm is required to reduce and prevent global TCP loss synchronization.
    IPv6 Support
    The SF250-48 provides native support for IPv6 alongside traditional IPv4. With USGv6 and IPv6 Gold Logo certifications, the SF250-48 will enable you to take advantage of IPv6-enabled operating systems and applications without having to upgrade your network equipment.
    IPv6 Features
  • IPv6 host mode
  • IPv6 over Ethernet
  • Dual IPv6/IPv4 stack
  • IPv6 neighbor and Router Discovery (ND)
  • IPv6 stateless address auto configuration
  • Path Maximum Transmission Unit (MTU) discovery
  • Duplicate Address Detection (DAD)
  • Internet Control Message Protocol (ICMP) version 6
  • IPv6 over IPv4 network with Intrasite Automatic Tunnel Addressing Protocol (ISATAP) support USGv6 and IPv6 Gold Logo certified
  • IPv6 QoS
    Prioritize IPv6 packets in hardware.
    IPv6 ACL (Access Control Lists)
    Drop or rate limit IPv6 packets in hardware.
    Multicast Listener Discovery (MLD V1/2) Snooping
    Deliver IPv6 multicast packets only to the required receivers.
    IPv6 Applications
    Web/SSL, Telnet server/SSH, Ping, Traceroute, Simple Network Time Protocol (SNTP), Trivial File Transfer Protocol (TFTP), Simple Network Management Protocol (SNMP), Remote Authentication Dial-In User Service (RADIUS), Syslog, DNS client, DHCP client, and DHCP autoconfig.
    The switch advertises itself using the Bonjour protocol.
    Cisco Discovery Protocol
    Allows the switch to advertise itself while discovering the connected device and its characteristics.
    General Features
  • Jumbo frames: Frame sizes up to 9K bytes. The default MTU is 2kB.
  • MAC table: 8K addresses
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