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SPECIFICATIONS
All information in this section is
relevant to all members of the 3Com
Switch 5500 10/100 family, unless
otherwise stated.
CONNECTORS
52-port models
48 auto-negotiating 10BASE-T/
100BASE-TX ports configured as auto-
MDI/MDIX; IEEE 802.3af in-line
power for PWR models
4 Gigabit SFP ports
28-port non-FX models
24 auto-negotiating 10BASE-T/
100BASE-TX ports configured as auto-
MDI/MDIX; IEEE 802.3af in-line
power for PWR models
4 Gigabit SFP ports
28-port FX
24 SFP ports, to be populated with
100BASE-X SFP multi- or single-mode
transceivers
2 auto-negotiating 10BASE-T/
100BASE-TX/1000BASE-T ports
configured as auto-MDI/MDIX
2 Gigabit SFP ports
PERFORMANCE
52-port
17.6 Gbps switching capacity, max.
13.1 Mpps forwarding rate, max.
28-port
12.8 Gbps switching capacity, max.
9.5 Mpps forwarding rate, max.
All models
Wirespeed performance across all
ports within stack or fabric
Store-and-forward switching;
latency <10 µs
2 Gbps full-duplex stacking bandwidth
LAYER 2 SWITCHING
16K MAC addresses in address table
Static MAC addresses: 256 (EI models);
64 (SI models); in addition to default
address
Jumbo Frame support (EI models only)
Port-based IEEE 802.1Q VLANs:
4,094 (EI models); 256 (SI models)
IEEE 802.1 Q-in-Q double-tagged
VLANs (EI models only)
IEEE 802.1v protocol-based VLANs
(EI models only)
MAC-based VLANs using RADA auto-
VLAN assignment
Auto-voice VLAN
IEEE 802.3ad Link Aggregation
Control Protocol (LACP); automated
and manual aggregation
Link aggregation trunk groups,
per switch:
• 26 (52-port); 14 (28-port)
• 8 10/100 ports or 8 SFP ports per
group
• 8 Distributed Link Aggregation
(DLA) groups
Auto-negotiation and manual
configuration of port speed and duplex
IEEE 802.3x full-duplex flow control
Back pressure flow control for half-
duplex
Unidirectional Link Detection (UDLD)
6
Broadcast, Multicast and Unicast
traffic suppression
IEEE 802.1D Spanning Tree Protocol
(STP)
IEEE 802.1w Rapid Spanning Tree
Protocol (RSTP)
IEEE 802.1s Multiple Spanning Tree
Protocol (MSTP)
Bridge Protocol Data Unit (BPDU)
protection
Spanning Tree root guard
Internet Group Management Protocol
(IGMP) v1 and v2 snooping
IGMP querier
Filtering for 256 multicast groups
LAYER 3 SWITCHING
Hardware based routing
Static routes: 256 (EI models);
64 (SI models); in addition to
default address
Address Resolution Protocol (ARP)
entries: 4K dynamic, 1K static
(EI models); 2K dynamic, 256 static
(SI models)
IP interfaces: 32 (EI models);
4 (SI models)
Routing Information Protocol (RIP),
v1 and v2: 2K routes (EI models);
1K (SI models)
Open Shortest Path First (OSPF)
(EI models only):
• 2 areas with 4 virtual interfaces
per area
• 2 neighbors per virtual interface
• 2 virtual links
Protocol Independent Multicast-Dense
Mode (PIM-DM) (EI models only)
Protocol Independent Multicast-Sparse
Mode (PIM-SM) (EI models only)
IGMP v1 and v2
Equal Cost Multipath Protocol (ECMP)
Multicast VLAN Registration (MVR)
Dynamic Host Configuration Protocol
Relay (DHCP Relay): 4 K max.
(EI models); 2 K max. (SI models)
3Com XRN
®
Technology:
• Resilient stacking and fabric links
up to 70 km (43.5 mi)
• Distributed Link Aggregation, hot-
swappable switch units; high-speed
fully resilient trunks up to 8 Gbps
• Distributed Resilient Routing:
optimized Layer 3, one routing table
per switch (EI models only)
Virtual Router Redundancy Protocol
(VRRP): EI models Only
CONVERGENCE
8 hardware queues per port
IEEE 802.1p Class of Service/Quality
of Service (CoS/QoS) on ingress and
egress
Remarking of packets based on
priority:
• Type of Service (ToS)
• IEEE 802.1p CoS
• IP precedence
• Physical port
• Source/destination MAC address
• VLAN information
• Ethertype
• Source/destination IP address
• Source/destination TCP port
• Source/destination UDP port
Webcache redirection (EI models only)
Time-based Access Control Lists
(ACLs) (EI models only)
Auto-prioritization of voice traffic
determined by vendor OUI
Weighted Round Robin (WRR),
including WRR+SP
Weighted Fair Queuing (WFQ),
including WFQ + SP
Strict Priority Queuing (SPQ)
Weighted Random Early Discard
(WRED)
DiffServ Code Point Expedited
Forwarding (DSCP EF) remarking for
prioritization of VoIP traffic
Application rate limiting and blocking
on ingress
Port-based traffic shaping on egress
IEEE 802.3af Power over Ethernet
standards-compliant (PWR models)
POE (PWR MODELS ONLY)
IEEE 802.3af PoE injection into Cat5
or 5e LAN wiring (300 W total max.)
Supports all standard and most
common pre-standard phones, access
points and other PoE devices from
selected vendors (Cisco, Nortel,
Philips, Siemens, Avaya, NEC,
Polycom, Pingtel, Proxim, et. al.)
Available standards-based supplemental
power system enables full 15.4 W to
all PoE ports in a switch or stack
SECURITY
IEEE 802.1X Network login user
authentication:
• Local, RADIUS, or TACACS+ server
authentication
• PAP , CHAP , EAP over LAN (EAPoL),
EAP-TLS/TTLS and PEAP
• Automatic port assignment of
VLANs, ACLs and QoS profile based
on user
• Multiple users per port
• 1,024 users per fabric
• Guest VLAN option
• Multiple authentication server realm
definitions
RADIUS/TACACS+ session accounting
RADIUS Authenticated Device Access
(RADA): authenticate devices based
on MAC address against RADIUS
server or local database; assign VLAN
ID and ACL through RADIUS
Combined MAC and IEEE 802.1X
authentication on same port
DHCP Tracker (EI models only)
DHCP snooping, including DHCP Trust
Wirespeed packet filtering in hardware
ACLs filter at Layers 2, 3 and 4:
• Source/destination MAC address
• Ethernet type
• Source/destination IP address
• Source/destination TCP port
• Source/destination UDP port
User-defined ACL filters
(EI models only)
Port-based MAC address Disconnect
Unknown Device (DUD)
IEEE 802.1X or TACACS+ user
authentication of switch management
on Telnet and console sessions
3COM
SWITCH 5500 10/100 FAMILY
®
MD5 cipher-text and clear-text
authentication for OSPF v2 and RIP
v2 packets and SNMP v3 traffic
Hierarchical management and password
protection for management interface
and encrypted traffic, with SNMP v3
and SSH v2
4 local user access privilege levels
Trusted management station IP and/or
MAC address
STACKING
Up to 400 user ports, including up to
384 10/100 ports
Single IP address and management
interfaces for stack-wide control
Hot-swappable, resilient stacking
Distributed stacking over standard
media with links up to 70 km (43.5 mi)
XRN Stacking Technology of up to
eight units high
Distributed Resilient Routing with
router tables in all units; no master/
slave arrangement (EI models only)
Stack Switch 5500 EI models only
with other like units using XRN
Technology via SFP ports
Stack Switch 5500 SI models only with
other like units using SFP ports
MANAGEMENT
CLI via console or Telnet
Embedded web management interface
System configuration with SNMP v1,
2c and 3
Comprehensive statistics, including
ACL/QoS and IP interface
Syslog
Remote Monitoring (RMON) groups
statistics, history, alarm and events
DHCP server including options 60, 82
and 184 (EI models only)
Supports multiple software images and
bank swap, stored in non-volatile
memory
Configuration conversion tool for
migration from Switch 3300, 4200
and 4400 to Switch 5500
1-to-1 port mirroring
Ability to apply ACL to mirror port
and forward only certain traffic types
Many-to-1 port mirroring
(EI models only)
VLAN-to-1 port mirroring
(EI models only)
Remote port mirroring (EI models only)
Detailed alarm and debug information
Front panel indicators for port and
unit status information
Supports ping, remote ping and
traceroute
Configuration file for backup and
restore, stored in non-volatile
memory; multiple configuration files
available
Backup and restore of software images
Network Time Protocol (NTP)
DHCP Relay and UDP Helper
System file transfer mechanisms:
Xmodem, FTP, Trivial FTP (TFTP),
Secure FTP (SFTP)