Cisco Small Business Smart Switches

Cisco SLM224G4S 24-Port 10/100 + 4-Port Gigabit Smart Switch: RCT

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Cost-Effective, Highly Secure Switching with Simplified Management for Growing Businesses


• Connects up to 24 network devices - PCs, printers, and servers - to share and transfer files and videos across your network

• Resilient Clustering provides the ability to add more switches as needed and allows the stack to be managed as a single switch

• Security down to the switch port level keeps unauthorized users off the network

• Intelligent QoS helps ensure a consistent network experience and supports networked applications including voice, video, and data storage

• Simplified, web-based management for easy installation and configuration

Figure 1. Cisco SLM224G4S 24-Port 10/100 + 4-Port Gigabit Smart Switch: RCT

Product Overview

Growing businesses require cost-effective networking solutions that can scale to meet ever-changing business needs. The Cisco ® SLM224G4S 24-Port 10/100 + 4-Port Gigabit Smart Switch with Resilient Clustering technology (Figure 1) brings increased intelligence and security to the network infrastructure at a cost-effective price. It offers twenty-four 10/100 Ethernet (copper) ports with four 10/100/1000 Gigabit Ethernet copper or optional optical Small Form-Factor Pluggable (SFP) interfaces for connecting the switch to the core network.
Network security is a top priority in any size business; unauthorized access to the network and mission-critical data is a constant concern. The Cisco SLM224G4S helps secure the network through 802.1X port authentication and MAC filtering. The 802.1X standard requires clients to authenticate themselves before they are given access to the network.
Resilient Clustering technology enables several switches to be clustered together and managed as a single switch with one web management interface and one IP address. This technology allows up to six units of the Cisco SLM224G4S switches (for up to 192 ports when combined with the Cisco SLM248G4S) to be set up in a switch cluster. Cisco SLM224G4S units can coexist in a switch cluster with other Cisco Small Business Smart Switches that support Resilient Clustering technology - the Cisco SLM224G4PS, SLM248G4S, and SLM248G4PS.
Businesses are recognizing the benefits of voice over IP (VoIP) technology and are quickly migrating their voice services to IP-based platforms, requiring their local area networks to support both voice and data applications. The extensive quality of service (QoS) features of the Cisco SLM224G4S make the solution ideal for real-time applications such as voice and video. The four priority queues, together with weighted round-robin and strict priority scheduling techniques, let network administrators quickly prioritize real-time voice and video traffic over data traffic. Individual users or applications can also be prioritized above others using various class of service options - by port, Layer 2 priority (802.1p), and Layer 3 priority (type of service [ToS] or differentiated services code point [DSCP]). Intelligent broadcast, multicast, and unknown unicast storm control minimizes and contains the effects that these types of storms have on regular traffic. Internet Group Management Protocol (IGMP) snooping limits bandwidth-intensive video traffic to only the requestors without flooding to all users. Incoming traffic can be policed and outgoing traffic can be shaped, allowing network administrators to control network access and traffic flow.
The Cisco SLM224G4S also includes features for network expansion and faster throughput. Link aggregation enables network administrators to create multiple high-bandwidth trunks between switches. This provides reliability because the system will continue to operate if one of the links breaks. Spanning Tree Protocol (STP) allows administrators to avoid network loops and to build a mesh of switches to increase the availability of their network.
The simplified user interface provides an intuitive, highly secure management platform, enabling administrators to better utilize the extensive feature set of the switch, for a better-optimized, more secure network.


• Twenty-four 10/100 switched RJ-45 ports deliver up to 4.8 Gbps of throughput

• Two shared 10/100/1000 mini Gigabit Interface Converter (mini-GBIC) ports

• Switching capacity delivers wire-speed performance at 12.8 Gbps nonblocking capacity

• WebView monitoring allows administrators to view the current status and configuration using their favorite web browser

• Automatic medium dependent interface (MDI) and MDI crossover (MDI-X) cable detection

• Port-based and 802.1Q-based VLANs support up to 128 VLANs

• Port configuration settings for link, speed, auto MDI/MDI-X, flow control, and more

• Fully rack mountable using the included rack-mounting hardware

• MAC address table supports up to 8000 MAC address entries

• Optimal platform to support real-time applications, such as voice and video, by providing features like IGMP snooping, multiple queues (four) with appropriate scheduling techniques, prioritization of traffic based on port, 802.1p, IP ToS/ precedence/DSCP, and line rate forwarding mechanisms

• Enhanced QoS functions, including rate limiting for ingress/egress and per flow at 64 kbps granularity

• HTTP interface

• User/network security via 802.1X (with RADIUS authentication) and MAC-based filtering

• Containment of storms - broadcast and multicast

• Expandability and availability increased across multiple switches using link aggregation

• Port trunking for up to eight groups with up to eight ports per group allows you to increase your bandwidth for each uplink or server connection

• Simple Network Management Protocol (SNMP) and Remote Monitoring (RMON) management expand your visibility options


Table 1 contains the specifications, package contents, and minimum requirements for the Cisco SLM224G4S 24-Port 10/100 + 4-Port Gigabit Smart Switch.

Table 1. Specifications for the Cisco SLM224G4S 24-Port 10/100 + 4-Port Gigabit Smart Switch: RCT



• 24 RJ-45 connectors for 10BASE-T/100BASE-TX
• 4 RJ-45 connectors for 10BASE-T/100BASE-TX/1000BASE-T with 2 shared SFP slots and 2 Gigabit ports



Cabling type

Unshielded twisted pair (UTP) Category 5 or better for 10BASE-T/100BASE-TX, UTP Category 5 Ethernet or better for 1000BASE-T


Power, Link/Act, Speed


Switching capacity

12.8 Gbps, nonblocking

MAC table size


Number of VLANs


Switch Clustering

Switch cluster operation

• Maximum switch cluster size: 192 ports
• Maximum number of units in switch cluster: 6 (with Cisco SLM248G4S)
• Hot insertion and removal
• Ring and chain options
• Master and backup master for resilient cluster control
• Auto-numbering or manual configuration of units in switch cluster


Web user interface

Built-in web user interface for easy browser-based configuration (HTTP)


SNMP versions 1, 2c, and 3


RFC1213 MIB-2, RFC2863 interface MIB, RFC2665 Ether-like MIB, RFC1493 bridge MIB, RFC2674 extended bridge MIB (P-bridge, Q-bridge), RFC 2819 RMON MIB (groups 1, 2, 3, and 9 only), RFC2737 entity MIB, RFC 2618 RADIUS client MIB


Embedded RMON software agent supports 4 RMON groups (history, statistics, alarms, and events) for enhanced traffic management, monitoring, and analysis

Firmware upgrade

• Web browser upgrade (HTTP)
• Trivial File Transfer Protocol (TFTP) upgrade

Port mirroring

Traffic on a port can be mirrored to another port for analysis with a network analyzer or RMON probe

Other management

• Switch audit log
• Dynamic Host Configuration Protocol (DHCP) client
• Simple Network Time Protocol (SNTP)
• Xmodem upgrade
• Cable diagnostics
• Port mirroring
• Ping

Security Features

IEEE 802.1X

802.1X authentication: RADIUS; Extensible Authentication Protocol - Tunneled Transport Layer Security (EAP-TTLS), Protected EAP (PEAP), EAP-MD5, Cisco LEAP, EAP-TLS

Access control



Link aggregation

• Link aggregation using IEEE 802.3ad Link Aggregation Control Protocol (LACP)
• Up to 8 ports in up to 8 trunks

Storm control

Broadcast and multicast

Spanning Tree

IEEE 802.1d Spanning Tree, Fast Linkover

IGMP snooping

IGMP (versions 1 and 2) snooping provides for fast client joins and leaves of multicast streams and limits bandwidth-intensive video traffic to only the requestors


Priority levels

4 hardware queues


Priority queuing and weighted round-robin (WRR)

Class of service

• Port based
• 802.1p VLAN priority based
• IPv4 IP precedence/ToS/DSCP

Layer 2


• Port-based and 802.1Q-based VLANs
• Management VLAN

Head-of-line (HOL) blocking

HOL blocking prevention

Jumbo frame

Supports frame size up to 10 KB


• 802.3 10BASE-T Ethernet
• 802.3u 100BASE-TX Fast Ethernet
• 802.3ab 1000BASE-T Gigabit Ethernet
• 802.3z Gigabit Ethernet
• 802.3x flow control



W x H x D

17.32 x 1.75 x 7.99 in,

(440 x 44.45 x 203 mm)

Unit weight

5.29 lb (2.4 kg)


100-240V 0.5A


FCC Part 15 Class A, CE Class A, UL CSA (CSA22.2), CE mark, CB

Operating temperature

32° to 104°F (0° to 40°C)

Storage temperature

-4° to 158°F (-20° to 70°C)

Operating humidity

20% to 95%, noncondensing

Storage humidity

5% to 90%, noncondensing

Package Contents

• Cisco SLM224G4S 24-Port 10/100 + 4-Port Gigabit Smart Switch
• AC power cord
• Rack-mounting kit with brackets and hardware
• CD with user guide in PDF format
• Online registration card
• Console cable

Minimum Requirements

• Web-based utility: Microsoft Internet Explorer (version 5.5 or above)
• Category 5 Ethernet network cable

Product Warranty

5-year limited hardware warranty with return to factory replacement and 90-day limited software warranty

Check the product package and contents for specific features supported. Specifications are subject to change without notice.

Cisco Limited Warranty for Cisco Small Business Series Products

This Cisco Small Business product comes with a 5-year limited hardware warranty with return to factory replacement and a 90-day limited software warranty. In addition, Cisco offers software application updates for bug fixes and telephone technical support at no charge for the first 12 months following the date of purchase. To download software updates, go to:
Product warranty terms and other information applicable to Cisco products are available at

For More Information

For more information on Cisco Small Business products and solutions, visit: