Cisco 48 Port Smart Managed Fast Ethernet PoE+ Switch, 2x Combo mini-GBIC, 24x PoE Ports (195W) / SF250-48HP

Performance

Switching capacity and forwarding rate, all switches are wire-speed and nonblocking

• Capacity in Millions of Packets per Second (mpps) (64-byte packets)
  • 13.10 
• Switching Capacity in Gigabits per Second (Gbps)
  • 17.6 

Layer 2 Switching

Spanning Tree Protocol (STP)

• Standard 802.1d spanning tree support
• Fast convergence using 802.1w (Rapid Spanning Tree [RSTP]), enabled by default
• Multiple spanning tree instances using 802.1s (MSTP); 8 instances are supported

Port grouping/link aggregation

• Support for IEEE 802.3ad Link Aggregation Control Protocol (LACP)
  • Up to 4 groups
  • Up to 8 ports per group with 16 candidate ports for each (dynamic) 802.3ad LAG

VLAN

• Support for up to 256 active VLANs simultaneously
• Port-based and 802.1Q tag-based VLANs
• Management VLAN

Voice VLAN

• Voice traffic is automatically assigned to a voice-specific VLAN and treated with appropriate levels of QoS. Auto voice capabilities deliver networkwide zero-touch deployment of voice endpoints and call control devices.

IGMP (versions 1, 2, and 3) 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).

HOL blocking

• Head-of-line (HOL) blocking.

Security

SSL

• Secure Sockets Layer (SSL) encrypts all HTTPS traffic, allowing secure access to the browser-based management GUI in the switch.

IEEE 802.1X (authenticator role)

• RADIUS authentication, MD5 hash, single/multiple host mode, and single/multiple sessions.

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 plaintext 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

• Supports RADIUS authentication for management access. Switch functions as a client.

Storm control

• Broadcast, multicast, and unknown unicast.

DoS prevention

• Denial-of-service (DoS) attack prevention.

Quality of Service

Priority levels

• 4 hardware queues

Scheduling

• Strict priority and weighted round-robin (WRR)

Class of service

• Port based; 802.1p VLAN priority based; IPv4/v6 IP precedence/ToS/DSCP based; DiffServ; trusted QoS
• Queue assignment based on differentiated services code point (DSCP) and class of service (802.1p/CoS)

Rate limiting

• Ingress policer, per VLAN, per port

Standards

• IEEE 802.3 10BASE-T Ethernet, IEEE 802.3u 100BASE-TX Fast Ethernet, IEEE 802.3ab 1000BASE-T Gigabit Ethernet, IEEE 802.3ad Link Aggregation Control Protocol, IEEE 802.3z Gigabit Ethernet, IEEE 802.3x Flow Control, IEEE 802.3 ad LACP, IEEE 802.1D (STP), IEEE 802.1Q/p VLAN, IEEE 802.1w RSTP, IEEE 802.1s Multiple STP, IEEE 802.1X Port Access Authentication, IEEE 802.3af, IEEE 802.3at, RFC 768, RFC 783, RFC 791, RFC 792, RFC 793, RFC 813, RFC 879, RFC 896, RFC 826, RFC 854, RFC 855, RFC 856, RFC 858, RFC 894, RFC 919, RFC 920, RFC 922, RFC 950, RFC 951, RFC 1042, RFC 1071, RFC 1123, RFC 1141, RFC 1155, RFC 1157, RFC 1213, RFC 1215, RFC 1286, RFC 1350, RFC 1442, RFC 1451, RFC 1493, RFC 1533, RFC 1541, RFC 1542, RFC 1573, RFC 1624, RFC 1643, RFC 1700, RFC 1757, RFC 1867, RFC 1907, RFC 2011, RFC 2012, RFC 2013, RFC 2030, RFC 2131, RFC 2132, RFC 2233, RFC 2576, RFC 2616, RFC 2618, RFC 2665, RFC 2666, RFC 2674, RFC 2737, RFC 2819, RFC 2863, RFC 3164, RFC 3411, RFC 3412, RFC 3413, RFC 3414, RFC 3415, RFC 3416, RFC 4330

IPv6

• 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 Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) support
• USGv6 and IPv6 Gold Logo certified

IPv6 QoS

• Prioritize IPv6 packets in hardware

Multicast Listener Discovery (MLD v1/2) snooping

• Deliver IPv6 multicast packets only to the required receivers

IPv6 applications

• Web/SSL, Ping, Traceroute, Simple Network Time Protoco (SNTP), Trivial File Transfer Protocol (TFTP), Simple Network Management Protocol (SNMP), Remote Authentication Dial-In User Service (RADIUS), Syslog, DNS client, DHCP Client, DHCP Autoconfig

IPv6 RFC supported

• RFC 4443 (which obsoletes RFC 2463): ICMPv6
• RFC 4291 (which obsoletes RFC 3513): IPv6 address architecture
• RFC 4291: IP Version 6 Addressing Architecture
• RFC 2460: IPv6 Specification
• RFC 4861 (which obsoletes RFC 2461): Neighbor Discovery for IPv6
• RFC 4862 (which obsoletes RFC 2462): IPv6 Stateless Address Autoconfiguration
• RFC 1981: Path MTU Discovery
• RFC 4007: IPv6 Scoped Address Architecture
• RFC 3484: Default address selection mechanism
• RFC 5214 (which obsoletes RFC 4214): ISATAP tunneling
• RFC 4293; MIB IPv6: Textual Conventions and General Group
• RFC 3595; Textual Conventions for IPv6 Flow Label

Management

Web user interface

• Built-in switch configuration utility for easy browser-based device configuration (HTTP/HTTPS). Supports configuration, system dashboard, system maintenance, and monitoring.

SNMP

• SNMP versions 1, 2c, and 3 with support for traps, and SNMP v3 User-based Security Model (USM)

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 SCP

Port mirroring

• Traffic on a port can be mirrored to another port for analysis with a network analyser 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 analyser or RMON probe. Up to 4 source VLANs can be mirrored to one destination port.

Dynamic Host Configuration Protocol (DHCP) (options 12, 66, 67, 129, and 150)

• DHCP options facilitate tighter control from a central point (DHCP server), to obtain IP address, auto configuration (with configuration file download), DHCP Relay, and host name.

Auto configuration

• 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.

Smartports

• Simplified configuration of QoS and security capabilities.

Auto Smartports

• Automatically applies the intelligence delivered through the Smartports roles to the port based on the devices discovered over Cisco Discovery Protocol or LLDP-MED. This facilitates zero-touch deployments.

Cloud services

• Support for Cisco Active Advisor

Localization

• Localization of GUI and documentation into multiple languages

Login banner

• Configurable multiple banners for web as well as CLI

Other management

• Traceroute; single IP management; HTTP/HTTPS; RADIUS; port mirroring; TFTP upgrade; DHCP client; Simple Network Time Protocol (SNTP); cable diagnostics; Ping; syslog; automatic time settings from Management Station.

Green (Power Efficiency)

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 the power consumption for shorter cables.

EEE compliant (802.3az)

• Supports IEEE 802.3az on all copper Gigabit Ethernet ports.

Disable port LEDs

• LEDs can be manually turned off to save on energy.

General

Jumbo frames

• Frame sizes up to 9K bytes. The default MTU is 2K bytes.

MAC table

• 8K addresses.

Discovery

Bonjour

• The switch advertises itself using the Bonjour protocol.

Link Layer Discovery Protocol (LLDP) (802.1ab) with LLDP-MED extensions

• Link Layer Discovery Protocol (LLDP) allows the switch to advertise its identification, configuration, and capabilities to neighboring devices that store the data in a MIB. LLDP-MED is an enhancement to LLDP that adds the extensions needed for IP phones.

Cisco Discovery Protocol

• The switch advertises itself using the Cisco Discovery Protocol. It also learns the connected device and its characteristics using Cisco Discovery Protocol.

Auto Smartports

• Automatically applies the intelligence delivered through the Smartports roles to the port based on the devices discovered over Cisco Discovery Protocol or LLDP-MED. This capability facilitates zero-touch deployments.

Product Specifications

802.3at PoE+ and 802.3af PoE delivered over any of the RJ-45 ports within the power budgets

• Switches support 802.3at PoE+, 802.3af, and Cisco pre-standard (legacy) PoE. Maximum power of 30.0W to any 10/100 or Gigabit Ethernet port for PoE+ supported devices and 15.4W for PoE supported devices, until the PoE budget for the switch is reached. The total power available for PoE per switch is as follows:
  • Power Dedicated to PoE
    • 195W
  • Number of Ports That Support PoE
    • 24 

Power consumption (worst case)

• Green Power (mode)
  • EEE, Energy Detect
• System Power Consumption
  • 110V=43.1W
  • 220V=44.3W
• Power Consumption (with PoE)
  • 110V=265.2W
  • 220V=255.8W
• Heat Dissipation (BTU/hr)
  • 904.90 

Ports

• Total System Ports
  • 48 Fast Ethernet and 2 Gigabit Ethernet
• RJ-45 Ports
  • 48 Fast Ethernet
• Combo Ports (RJ-45 + SFP)
  • 2 Gigabit Ethernet combo

USB slot

• USB slot on the front panel of the switch for easy file and image management

Buttons

• Reset button

Cabling type

• Unshielded twisted pair (UTP) Category 5 or better for 10BASE-T/100BASE-TX; UTP Category 5e or better for 1000BASE-T

LEDs

• System, Link/Act, PoE, Speed

Flash

• 256 MB

CPU

• 800 MHz ARM

CPU memory

• 512 MB

Packet Buffer

• 24Mb

Environmental

Unit dimensions (W x H x D)

• 440 x 44 x 350 mm (17.3 x 1.45 x 13.78 in)

Unit weight

• 4.93 kg (10.87 lb)

Power

• 100 - 240V 47 - 63 Hz, internal, universal

Certification

• UL (UL 60950), CSA (CSA 22.2), CE mark, FCC Part 15 (CFR 47) Class A

Operating temperature

• 32° to 122°F (0° to 50°C)

Storage temperature

• -4° to 158°F (-20° to 70°C)

Operating humidity

• 10% to 90%, relative, noncondensing

Storage humidity

• 10% to 90%, relative, noncondensing

Acoustic noise and mean time between failures (MTBF)

• Fan (Number)
  • 2
• Acoustic Noise
  • 0°C - 30°C: 38.0dB 50°C: 52.7dB
• MTBF at 50°C (Hours)
  • 286,555.77 

Warranty