3Com SuperStack 3 4900 User manual

1
3Com®SuperStack®3Switch 4900 Family
Key Benefits
Unbeatable Resilience
The SuperStack 3 Switch 4900 family of
products supports 3Com’s XRN®technology
providing outstanding resilience and
reliability, at double the performance of
traditional resilient solutions. With XRN
technology, Layer 2 and Layer 3 networks
can be created with no single point of failure,
but still utilizing the full performance of
the network.
Performance
3Com’s custom ASIC architecture delivers
wirespeed, non-blocking Gigabit Ethernet
switching across all ports, minimizing server
farm and network congestion. Further scale
performance using XRN technology, with
two units operating together as a single
management switching entity.
Advanced Network Control
Advanced Layer 2/4 functionality such as
multicast filtering, virtual LANs, and
multilayer traffic classification and
prioritization improve traffic control
across the network. XRN technology
supports two geographically distributed
switches managed as a single Layer 2 /
Layer 3 entity.
Layer 3
Switches support RIP v1/v2, OSPF, CIDR
and UDP helper; the resilient capabilities of
XRN technology allow two units to share
IP interfaces eliminating the need for
complex implementations such as VRRP.
Advanced Security Capabilities
Secure network resources from unauthorized
access with RADIUS client support and
Access Control Lists.
High Availability
Robust features include link aggregation,
support for Rapid Spanning Tree protocol,
an optional Redundant Power Supply system,
and e-mail or pager status notification, all
ensuring maximum uptime for critical
applications.
Powerful Management
Comprehensivesupport within the 3Com
management application software suite,
including within the standalone package
3Com Network Director and with 3Com
Network Administrator for HP OpenView-
based management.
DATA SHEET
The 3Com SuperStack 3 Switch 4900 Family
consists of four high-performance, wire-
speed, Layer 2 / Layer 3 / Layer 4 Gigabit
switches. These enterprise-class devices are
ideal for server farm aggregation in enterprise
environments.
• 3Com SuperStack 3 Switch 4900 comes
with 12 100/1000 copper ports.
• 3Com SuperStack 3 Switch 4900 SX has
12 1000BASE-SX ports.
•3Com SuperStack 3 Switch 4924 comes
with 24 10/100/1000 copper ports.
•3Com SuperStack 3 Switch 4950 has 12
10/100/1000 copper ports, six 1000BASE-SX
ports, and six flexible GBIC ports.
All these switches optionally support 3Com’s
patented XRN technologyallowing you to
quickly build a fully redundant aggregation
or network core solution out of a pair of
3Com Gigabit switches—delivering high
resiliency without complexity.
The Gigabit Multilayer Switching (GMS)
Softwareis the operating softwareof the
3Com SuperStack 3 Switch 4900 Family.
Now included with all new switches are
advanced features of the GMS Software,
formerly sold separately, features such as
OSPF routing and support for geographically
distributed XRN configurations.
Gigabit Ethernet is Ideal for Server Farm Aggregation
• Layer 2/3/4 Gigabit switching ideal
for server aggregation
• Choose from among 12- and 24-
port models with fiber or copper
connectivity
•Combine multiple units using
3Com XRN technology for
resiliency without complexity

3COM®SUPERSTACK®3SWITCH 4900 FAMILY DATA SHEET
2
Server
farm
3Com
®
SuperStack
®
3 Switch4400 stacks
XRN Distributed Fabric
XRN DistributedFabric
SuperStack 3 Switch 4400 stacks
Link Aggregation
Link Aggregation (802.3ad)
Link Aggregation (802.3ad)
RSTP (802.1w)
RSTP (802.1w)
NIC Load Balancing (or Teaming)
3Com
1000BASE-T
Server NICs
3Com Switch 4070
3Com Switch 4070
SuperStack 3
Switch 4924
SuperStack 3
Switch 4924
3Com SuperStack 3Switch 3870 stacks
3CR17450-91
Switch3870
3CR17450-91
Switch3870
3CR17451-91
Switch3870
3CR17450-91
Switch3870
3CR17451-91
Switch3870
3CR17450-91
Switch3870
3CR17451-91
Switch3870
3CR17450-91
Switch3870
3CR17450-91
Switch3870
3CR17450-91
Switch3870
3CR17451-91
Switch3870
3CR17450-91
Switch3870
3CR17451-91
Switch3870
3CR17450-91
Switch3870
3CR17451-91
Switch3870
3CR17450-91
Switch3870
3Com SuperStack 3 Switch 4900 supporting a server farm
Sample configurations
supported by the
SuperStack 3
Switch 4900 Family
XRN™ technology, which stands for eXpandable
Resilient Networking, is patented, innovative
3Com technology that allows IT managers to
build affordable networks that arehighly resilient
and deliver exceptional performance and flexibility.
With XRN technology, multiple interconnected
Gigabit switches behave as a single management
switching entity. The units actively share the load
in normal operation yet one will near-instantly
recover all connections should the other unit or
its connections have a failure. XRN technology is
supported by the 3Com SuperStack 3 Switch
4900 for server aggregation and by the 3Com
Switch 40x0 for building core networking. It is
high resiliency without complexity.
3Com Network
Supervisor
3Com
®
SuperStack
®
3
Switch 4924
3Com Switch 7700 SuperStack 3
Switch 4950
1000BASE-SX
LAG
10/100
1000BASE-T
SuperStack 3
Switch 4924
SuperStack 3
Switch 4924
1000BASE-SX 1000BASE-SX
1000BASE-SX
LAG
1000BASE-SX
LAG
SuperStack 3
Switch 4924
SuperStack 3
Switch 4950
SuperStack 3 Switch 4900 family switches can
deliver Gigabit-to-the-desktop with Layer 2/3/4
switching for bandwidth-intensive networks.

3
3COM®SUPERSTACK®3SWITCH 4900 FAMILY DATA SHEET
Features
PERFORMANCE
Switching Capacity 32Gbps for SuperStack 3 Switch 4900 and 4900 SX; 56Gbps for SuperStack 3 Switch 4924 and 4950
Forwarding Rate 23.8Mpps for SuperStack 3 Switch 4900 and 4900 SX; 41.6Mpps for SuperStack 3 Switch 4924 and 4950
Store and Forward Switching Latency 2.7 microseconds for all models
LAYER 2 SWITCHING
MAC Addresses 12K MAC addresses
VLAN 30 VLANs (IEEE 802.1Q)
Link Aggregation Manual and LACP Link Aggregation (IEEE 802.3ad). 13 groups/4 ports in each
Auto Negotiation Auto-negotiation of port speed, duplex, and connection (MDI/MDIX)
Traffic Control IEEE 802.3x full-duplex flow control
Back pressure flow control for half-duplex
Supports Broadcast Storm Suppression
Spanning Tree IEEE 802.1D Spanning Tree Protocol (STP)
IEEE 802.1w Rapid Spanning Tree Protocol (RSTP), backward-compatible with STP
Fast-start mode
Spanning tree enable/disable per port or per VLAN
LAYER 3 SWITCHING
Routes Hardware-based routing
2,000 IP routes
100 Static Routes
5,000 ARP entries
64 IP interfaces
IP Routing IP Multinetting (multiple IP interfaces per VLAN)
CIDR (Classless Internet Domain Routing)
RIP (Routing Information Protocol), v1 and v2
OSPF (Open Shortest Path First)
• 4 areas with 64 adjacencies
• ASBR support for static and default routes
Multicast Filtering for 128 multicast groups
IGMP (Internet Group Management Protocol) snooping on Layer 2 interfaces
IGMP v1 and v2
IGMP Querier
Network Protocol DHCP Relay (Dynamic Host Configuration Protocol Relay)
UDP (User Datagram Protocol) Helper
ARP (Address Resolution Protocol)
Access Control Lists VLAN-based ACLs
•Filtered on destination IP address / mask
CONVERGENCE
Priority Queues Four hardware queues per port
Weighted Round Robin queuing
Traffic Prioritization Priority based on:
• IP address*
• IEEE 802.1p Class of Service (CoS) VLAN priority
• TCP/UDP destination port number
• DSCP (DiffServ Code Point)
•Ethertype*
• Default port priority
• Auto classification of 3Com NBX®telephony traffic
*Only available on SuperStack 3 Switch 4924 and 4950 models.

3COM®SUPERSTACK®3SWITCH 4900 FAMILY DATA SHEET
4
Features (continued)
RESILIENCY
3Com XRN Technology support
Dual software images
Backup and restore of switch settings
MANAGEMENT
Device Management Local or RADIUS management of switch passwords
Web-based management
Command line interface (CLI)
Serial (9-pin D-type connector)
Telnet
SNMP v1
3Com Management Applications
•3Com Network Supervisor for basic, turn-key network management for small and
medium businesses
• 3Com Network Director for comprehensive, turn-key network management for the enterprise
• 3Com Enterprise Management Suite for flexible, extensible management in advanced
enterprise IT environments
Software Dual software images
Backup and restore
TFTP configuration: upload/download
TFTP agent: upload
Mirror Port /RAP (Roving Analysis Port): one-to-one
RMON Seven Groups: Statistics, History, Alarms, Host, HostTopN, Matrix, Events
IP Address allocation DHCP
BOOTP
Manual
Auto IP
OPTIONAL SERVICE AND SUPPORT
Network Health Check An activity-auditing service focused on improving network performance and productivity
Includes traffic monitoring, utilization analysis, problem identification, and asset deployment recommendations
Extensive report provides blueprint for action
Network Design Includes review of business plan, extensive inventory of requirements, and complete design document
specifying implementation details
Network Installation Experts set up and configure equipment and integrate technologies to maximize functionality and
minimize business disruption
Service may include physical site survey and network design and engineering based on evaluation of
business objectives
Project Management Provides extra focus and resources that special projects demand
3Com engineer(s) manage entire process from initial specifications to post-project review
Using structured methodology, requirements are identified, projects planned, and progress of
implementation activities tracked
3Com GuardianSM Maintenance Service Provides comprehensive onsite support, including advance hardware replacement, telephone technical
support, and software upgrades:
• Telephone support backed by powerful call-tracking database and replication laboratory
• Software upgrades ensure access to pertinent patches
3Com ExpressSM Maintenance Service Benefits customers who prefer to maintain own hardware
Bolsters in-house resources with convenient and speedy access to 3Com hardware replacements,
software upgrades, and telephone support

5
3COM®SUPERSTACK®3SWITCH 4900 FAMILY DATA SHEET
Specifications
All information is for SuperStack 3 Switch 4900
Family unless stated otherwise.
Connectors
SuperStack 3 Switch 4900:
12 10/100/1000 copper ports
SuperStack 3 Switch 4900 SX:
12 1000BASE-SX ports (MT-RJ)
SuperStack 3 Switch 4924:
2410/100/1000 copper ports
SuperStack 3 Switch 4950:
1210/100/1000 copper ports, 6 1000BASE-SX ports
(MT-RJ), 6 GBIC ports
All have one module slot accommodating Switch 4900
family expansion modules
All have Advanced Redundant Power System Type 3
connector
SuperStack 3 Switch 4900 Expansion Modules:
3C17710: 4 x 1000BASE-SX ports (MT-RJ)
3C17711: 4 x 1000BASE-T ports (MT-RJ)
3C17712: 4 x 1000BASE-LX ports (MT-RJ)
3C17714: 4 x GBIC ports
Dimensions
Height: 6.6 cm (2.6 in)
Width: 44 cm (17.3 in)
Depth:
SuperStack 3 Switch4900 & 4900 SX:37 cm (14.5 in)
SuperStack 3 Switch 4924 & 4950:41 cm (16.3 in)
Weight:
SuperStack 3 Switch4900 & 4900 SX:6.5 kg (14.3 lb)
SuperStack 3 Switch4924:6.3 kg (13.9 lb)
SuperStack 3 Switch4950:6.7 kg (14.8 lb)
Performance
SuperStack 3 Switch 4900 & 4900 SX
23 million packets per second
SuperStack 3 Switch 4924 & 4950
41.6 million packets per second
Reliability
SuperStack 3 Switch4900: 317,000 hours
SuperStack 3 Switch 4900 SX: 340,000 hours
SuperStack 3 Switch 4924: 208,000 hours
SuperStack 3 Switch 4950: 266,000 hours
Environmental Requirements
Operating temperature: 0° to 40°C (32° to 104°F)
Storage Temperature: -40° to +70°C (-40° to +158°F)
Operating Humidity: 10% to 90% relative humidity
non-condensing
Standards: EN60068 (IEC68)
Safety Agency Certifications
EN60950, IEC 60950 UL60950, CSA22.2 No. 60950
Emissions
EN55022 Class A, FCC Part 15 Subpart B Class A,
ICES-003 Class A, VCCI Class A, AS/NZS 3548 Class A,
CNS 13438 Class A
Immunity: EN55024
Heat Dissipation:
4900 & 4900 SX:50 W maximum (168 BTU/hr)
4924:254 W maximum (870 BTU/hr)
4950:200 W maximum (683 BTU/hr)
Power Supply
ACLine Frequency 50/60 Hz
Input Voltage Options 90-240 VAC
Current Rating 4.5A maximum
Industry Standards Supported
Ethernet Protocols
IEEE 802.1D (STP)
IEEE 802.1p (CoS)
IEEE 802.1Q (VLANs)
IEEE 802.1w (RSTP)
IEEE 802.3ad (Link Aggregation)
IEEE 802.3i (10BASE-T)
IEEE 802.3u (Fast Ethernet)
IEEE 802.3x (Flow Control)
IEEE 802.3z (Gigabit Ethernet)
Administration Protocols
RFC768 (UDP)
RFC791 (IP)
RFC792 (ICMP)
RFC793 (TCP)
RFC826 (ARP)
RFC854 (Telnet)
RFC1350 (TFTP)
RFC1542 (BOOTP/DHCP)
RFC2616 (HTTP)
SNMP Standards
RFC1157 (SNMP Protocol)
RFC1213 (SNMP MIB II)
RFC1215 (SNMP MIB II Traps)
RFC1493 (Bridge MIB)
RFC1659 (RS232 MIB)
RFC1757 (RMON I)
RFC2021 (RMON II Probe Config)
RFC2233 (Interfaces MIB)
RFC2618 (RADIUS Authentication Client MIB)
RFC2665 (EtherLike-MIB)
RFC2620 (RADIUS Accounting Client MIB)
RFC2674 (Bridge MIB Extensions)
RFC2668 (MAU MIB)
RFC2925 (Traceroute, Remote PING, Lookup MIB)
Routing Protocols
RFC1058 (RIP)
RFC1519 (CIDR)
RFC1723 (RIP v2)
RFC 1724 (RIP v2 Extensions)
RFC1850 (OSPF MIB)
RFC2328 (OSPF Version 2)
RFC2096 (IP Forwarding Table)
RFC2131 (BOOTP/DHCP Relay)
Management
Web interface
Command line interface
SNMP compatibility
Management through 3Com management applications
-3Com Network Supervisor
-3Com Network Director
-3Com Enterprise Management Suite
Warranty
Limited Lifetime Hardware Warranty. Limited
Software Warranty for ninety (90) days. See
www.3com.com/warranty for details.
Other Service Benefits
Advance hardware replacement with same day shipment
for North America and Western Europe. Next day
shipment for rest of world. Calls must be received
by published cut-off times.
90 days of telephone technical support. Limited software
updates.
See www.3com.com/warranty for more detail.
Register products at http://eSupport.3com.com/

3Com Corporation, Corporate Headquarters, 350 Campus Drive, Marlborough, MA 01752-3064
Tolearnmore about 3Com solutions, visit www.3com.com. 3Com is publicly traded on NASDAQ under the symbol COMS.
Copyright © 2005 3Com Corporation. All rights reserved. 3Com, the 3Com logo, SuperStack, NBX, and XRN are registered
trademarks, and Guardian and Express are servicemarks of 3Com Corporation. All other company and product names may be
trademarks of their respective companies. While every effort is made to ensure the information given is accurate, 3Com does not
accept liability for any errors or mistakes which may arise. Specifications and other information in this document may be subject
to change without notice. 400874-002 09/05
Ordering Information
3COM®SUPERSTACK®3SWITCH 4900 FAMILY DATA SHEET
PRODUCT DESCRIPTION 3COM SKU
Switches
3Com SuperStack 3 Switch 4900 3C17700
3Com SuperStack 3 Switch 4900 SX 3C17702
3Com SuperStack 3 Switch 4924 3C17701
3Com SuperStack 3 Switch 4950 3C17706
Optional Modules and Accessories
3Com XRN Interconnect Kit 3C17715
3Com 5m XRN Interconnect Cable 3C17722
3Com 4-Port 1000BASE-SX Module for SuperStack 3 Switch 4900 and Switch 40x0 3C17710
3Com 4-Port 1000BASE-T Module for SuperStack 3 Switch 4900 and Switch 40x0 3C17711
3Com 4-Port 1000BASE-LX Module for SuperStack 3 Switch 4900 and Switch 40x0 3C17712
3Com 4-Port GBIC Module for SuperStack 3 Switch 4900 and Switch 40x0 3C17714
Transceivers
3Com 1000BASE-SX GBIC 3CGBIC91
3Com 1000BASE-LX GBIC 3CGBIC92
3Com 1000BASE-T GBIC 3CGBIC93A
3Com 1000BASE-LH70 GBIC 3CGBIC97
Redundant Power
3Com SuperStack Advanced Redundant Power System Chassis 3C16071B
3Com SuperStack Advanced Redundant Power System Type 3 325W 3C16075
Network Management
3Com Network Director 3C15500
3Com Enterprise Management Suite 3C15600
3Com ExpressSM Service Plans1Americas EMEA / AP2
3Com SuperStack 3 Switch 4900 3CS-EX7N-08E 3CS-EXP4-X17
3Com SuperStack 3 Switch 4900SX 3CS-EX7N-11E 3CS-EXP4-X20
3Com SuperStack 3 Switch 4924 3CS-EX7N-10E 3CS-EXP4-X19
3Com SuperStack 3 Switch 4950 3CS-EX7N-13E 3CS-EXP4-X21
1Includes telephone support, advance hardware replacement, and software upgrades
2Europe, Middle East, Africa and Asia Pacific