Linksys SLM248G4S User Manual

Cost-effective, secure switching with
simplified management for your

SLM248G4S

growing business

Growing businesses require cost-effective, networking solutions that can scale with ever­changing business needs. The Linksys SLM248G4S Smart Switch with Resilient Clustering
technology brings a whole new level of intelligence and security to the network infrastructure
at a cost-effective price. It offers 48 10/100 Ethernet (copper) ports with four 10/100/1000
Gigabit Ethernet copper or optional optical (SFP) interfaces for uplinking 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 SLM248G4S is able to secure the network through

802.1X port authentication and MAC Filtering. 802.1X requires clients to authenticate themselves
before they are given access to the network.

The SLM248G4S switches provide Resilient Clustering technology which 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 4 units of the SLM248G4S (or up to 192 ports when
combined with SLM224G4S) to be set up in a switch cluster. SLM248G4S units can coexist in a switch
cluster with other Linksys Smart Switches that support Resilient Clustering technology—SLM224G4PS,
SLM224G4S, 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 SLM248G4S’s extensive QoS features make the solution ideal for real-time
applications like 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 (TOS or DSCP).
Intelligent Broadcast, Multicast, and Unknown Unicast storm control minimizes and contains the effects
that these types of storms have on regular traffic. 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 SLM248G4S also includes features for network expansion and faster throughput performance. Link
aggregation enables network administrators to create multiple high-bandwidth trunks between switches. This
provides a level of reliability because the system will continue to operate if one of the links breaks. Spanning
Tree (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, secure management platform enabling administrators to
better utilize the extensive feature set of the switch, resulting in a better optimized, more secure network.

Easy-to-use Web
browser interface makes
installation quick and
effortless

Grow your network with
options like Resilient
Clustering and Link
Aggregation

802.1X port authentication
and MAC address filtering
brings network security down
to the switch port level

Advanced QoS enables the
network to be optimized for your
networked applications, including
voice, video and data storage

PRODUCT DATA

48-Port 10/100 + 4-Port Gigabit
Smart Switch with Resilient
Clustering Technology

Model: SLM248G4S

BUSINESS SERIES

Features

48 - 10/100 Switched RJ-45

•
ports deliver up to 9.6 Gbps
of throughput

2 shared 10/100/1000 mini-

•
GBIC ports

Switching Capacity delivers

•
wire-speed performance
at 17.6 Gbps non-blocking
capacity

WebView monitoring

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

Auto MDI/MDIX per port

•
allows for automatic Cable
detection

Port-based and 802.1q-

•
based VLANs support up to
128 VLANs

Port configuration settings

•
for Link, Speed, Auto MDI/
MDIX, Flow Control, and
more

Fully rack-mountable using

•
the included rack mounting
hardware

MAC Address table supports

•
up to 8K MAC Address
entries

Optimal platform to support

•
real-time applications,
such as voice and video,
by providing features like
IGMP snooping, multiple
queues (4) with appropriate
scheduling techniques,
prioritization of traffic based
on port, 802.1p, IP TOS/
precedence/DSCP, and line
rate forwarding mechanisms

•

48-Port 10/100 + 4-Port Gigabit Smart Switch with
Resilient Clustering Technology

Specifications

Model SLM248G4S
Ports 48 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

Buttons None
Cabling Type UTP CAT 5 or better for 10BASE-T/100BASE-TX,

UTP CAT 5e or better for 1000BASE-T
LEDs Power, Link/Act, Speed

Performance

Switching Capacity 17.6 Gbps, Non-blocking
MAC Table Size 8K
Number of VLANs 128

Switch Clustering

Switch Cluster Operation Maximum Switch Cluster Size: 192 Ports
Maximum no. of Units in Switch Cluster: 6 (with SLM224G4S)
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

Management

Web User Interface Built-in Web UI for easy browser-based configuration (HTTP)
SNMP SNMP version 1, 2c, 3
SNMP MIBs RFC1213 MIB-2, RFC2863 Interface MIB, RFC2665 Ether-like MIB,

RFC1493 Bridge MIB, RFC2674 Extended Bridge MIB (P-bridge, Q-bridge),
RFC2819 RMON MIB (groups 1, 2, 3, 9 only), RFC2737 Entity MIB,
RFC 2618 RADIUS Client MIB

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

Firmware Upgrade Web Browser Upgrade (HTTP)
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
DHCP Client
BootP
SNTP
Xmodem Upgrade
Cable Diagnostics
Port Mirroring
PING

PRODUCT DATA

BUSINESS SERIES

Security Features

IEEE 802.1x 802.1x Authentication: RADIUS; EAP-TTLS, PEAP, EAP-MD5, LEAP, EAP-TLS
Access Control ToS/DSCP

Availability

Link Aggregation Link Aggregation Using IEEE 802.3ad 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 (v1/v2) Snooping provides for fast client joins and leaves of multicast

streams and limits bandwidth-intensive video traffic to only the requestors

QoS

Priority Levels 4 Hardware Queues
Scheduling Priority Queueing and Weighted Round Robin (WRR)
Class of Service Port-based

802.1p VLAN Priority-based
IPv4 IP Precedence/ToS/DSCP