Cisco Catalyst 3750 Series Switches
Data Sheet
Figure 1
Cisco Catalyst 3750
Series Switches for 10/
100 and 10/100/1000
access and aggregation
Product Overview
The new Cisco Catalyst 3750 Series
switches are an innovative product line that
improves LAN operating efficiency by
combining industry-leading ease of use and
thehighestresiliencyavailableforstackable
switches.This newproduct seriesrepresents
the next generation in desktop switches,
™
and features Cisco StackWise
technology,
a 32-Gbps stack interconnect that allows
customersto build a unified, highly resilient
switching system—one switch at a time.
For mid-sized organizations and enterprise
branch offices, the Cisco Catalyst 3750
Series eases deployment of converged
applications and adapts to changing
business needs by providing configuration
flexibility, support for converged network
patterns, and automation of intelligent
network-services configurations. In
addition, the Cisco Catalyst 3750 Series is
optimizedfor high-density GigabitEthernet
deploymentsand includes adiverse range of
switches that meet access, aggregation, or
small-network backbone-connectivity
requirements.
Configurations
• Cisco Catalyst 3750G-24TS—24
Ethernet 10/100/1000 ports and 4 SFP
uplinks
• Cisco Catalyst 3750G-24T—24
Ethernet 10/100/1000 ports
• CiscoCatalyst 3750G-12S—12 Gigabit
Ethernet SFP ports
• Cisco Catalyst 3750-48TS—48
Ethernet 10/100 ports and 4 SFP
uplinks
• Cisco Catalyst 3750-24TS—24
Ethernet 10/100 ports and 2 small
form-factor pluggable (SFP) uplinks
Cisco Catalyst 3750 Series is available in
the Standard Multilayer Software Image
(SMI) or the EnhancedMultilayerSoftware
Image (EMI). The SMI feature set includes
advanced quality of service (QoS),
rate-limiting, access control lists (ACLs),
and basic static and routed information
protocol (RIP) routing functionality. The
EMIprovides a richer set of enterprise-class
features including advanced
hardware-based IP unicast and multicast
routing.
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Cisco StackWise Technology—A New Standard in Stackable Resiliency
Cisco StackWise technology is a premium stacking architecture optimized for Gigabit Ethernet. This technology is
designed to respond to additions, deletions, and redeployment while maintaining constant performance.
Cisco StackWisetechnology unites up to nine individual Cisco Catalyst 3750 switches into a single logical unit, using
special stack interconnect cables and stacking software. The stack behaves as a single switching unit that is managed
by a master switch elected from one of the member switches. The master switch automatically creates and updates
all the switching and optional routing tables. A working stack can accept new members or delete old ones without
service interruption.
Key Features and Benef its
Ease of Use—“Plug-and-Play” Configuration
A working stack is self-managing and self-configuring. When switches are added or removed, the master switch
automatically updates all the routing tables to reflect changes. Upgrades are applied universally and simultaneously
to all members of the stack.
Scalability—Fast Ethernet to Gigabit Ethernet
The Cisco Catalyst 3750 Series stacks up to 9 switches as a single logical unit for a total of 468 Ethernet 10/100 ports
or 252 Ethernet 10/100/1000 ports. Individual 10/100 and 10/100/1000 units may be joined in any combination to
evolve with network needs.
Mix-and-Match Switch Types—Pay as You Expand Your Network
Stacks can be created with any combination of Cisco Catalyst 3750 switches. Customers who need a mixture of
10/100, 10/100/1000 ports and wiring closet aggregation capability can incrementally develop the access
environment, paying only for what they need.
Availability—Non-Stop Performance at Layer 2 and Layer 3
The Cisco Catalyst 3750 Series increases availability for stackable switches. Each switch can operate both as master
controller and forwarding processor. Each switch in the stack can serve as a master, creating an 1:N availability
scheme for network control. In the unlikely event of a single unit failure, all other units continue to forward traffic
and maintain operation.
Smart Multicast—A New Level of Efficiency for Converged Networks
With Cisco StackWise technology, the Cisco Catalyst 3750 Series offers greater efficiency for multicast applications
such as video. Each data packet is put on to the backplane only once, which provides more effective support for more
data streams.
Superior Quality of Service—Across the Stack and at Wire Speed
The Cisco Catalyst 3750 Series offers Gigabit Ethernet speed with intelligent services that keep everything flowing
smoothly—even at ten times normal network speed. Industry-leading mechanisms for marking, classification, and
scheduling deliver best-in-class performance for data, voice, and video traffic—all at wire speed.
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Security—Granular Control for the Access Environment
The Cisco Catalyst 3750 Series supports a comprehensive set of security features for connectivity and access control,
including ACLs, authentication, port-level security,and identity-based network services with 802.1x and extensions.
Single IP Management—Many Switches, One Address
EachCiscoCatalyst 3750 Series stack is managed as a single object and has a single IP address. Single IP management
is supported for activities such as fault detection, virtual LAN creation and modification, security,and QoS controls.
Jumbo Frames—Support for High-Demand Applications
The Cisco Catalyst 3750 Series supports jumbo frames on the 10/100/1000 configurations for advanced data and
video applications requiring very large frames.
IPv6 Capable—Getting Ready For The Future
The Catalyst 3750 supports IPv6 routing in hardware for maximum performance. As network devices grow and
the need for larger addressing and higher security become necessary, the Catalyst 3750 will be ready to meet the
requirement.
Management Options
The Cisco Catalyst 3750 Series offers both a superior command-line interface (CLI) for detailed configuration and
Cisco Cluster Management Suite (CMS) Software, a Web-based tool for quick configuration based on pre-set
templates. In addition, CiscoWorks supports the Cisco Catalyst 3750 Series for network-wide management.
Figure 2
Cisco Catalyst 3750 Series Switches
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Product Specifications
Table 1 Product Features and Benefits
Feature Benefit
Ease of use and deployment • Auto-configuration of new stack units eliminates reconfiguration.
• Dynamic Host Configuration Protocol (DHCP) auto-configuration of multiple
switches through a boot server eases switch deployment.
• Automatic Cisco IOS Software version checking and updating helps ensure that
all stack members have the same software version.
• Automatic QoS (AutoQoS) simplifies QoS configuration in voice-over-IP (VoIP)
networks by issuing interface and global switch commands to detect Cisco IP
phones, classify traffic, and enable egress queue configuration.
• Master configuration management ensures that all switches are automatically
upgraded when the master switch receives a new software version.
• Auto-sensing on each non-SFP port detects the speed of the attached device and
automatically configures the port for 10-, 100-, or 1000-Mbps operation, easing
switch deployment in mixed 10, 100, and 1000BASE-T environments.
• Auto-negotiating on all ports automatically selects half- or full-duplex
transmission mode to optimize bandwidth.
• Dynamic Trunking Protocol (DTP) enables dynamic trunk configuration across all
switch ports.
• Port Aggregation Protocol (PAgP) automates the creation of Cisco Fast
EtherChannel groups or Gigabit EtherChannel groups to link to another switch,
router, or server.
• Link Aggregation Control Protocol (LACP) allows the creation of Ethernet
channeling with devices that conform to IEEE 802.3ad. This feature is similar to
Cisco EtherChannel technology and PAgP.
• DHCP Relay allows a DHCP relay agent to broadcast DHCP requests to the
network DHCP server.
• IEEE 802.3z-compliant 1000BASE-SX, 1000BASE-LX/LH, 1000BASE-ZX,
1000BASE-T and CWDM* physical interface support through a field-replaceable
SFP module provides unprecedented flexibility in switch deployment.
• To help ensure that the switch can be quickly connected to the network and can
pass traffic with minimal user intervention, there is a default configuration stored
in Flash.
• Auto-MDIX (media-dependent interface cross-over) automatically adjusts
transmit and receive pairs if an incorrect cable type (cross-over or
straight-through) is installed.
Availability/Scalability
Superior redundancy for
fault backup
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• 1:N master redundancy allows eachstack member to serve as a master,providing
the highest reliability for forwarding.
• Cisco CrossStack UplinkFast (CSUF) technology provides increased redundancy
and network resiliency through fast spanning-tree convergence (less than 2
seconds) across a switch stack with Cisco StackWise Technology.
• Cross-Stack EtherChannel provides the ability to configure Cisco EtherChannel
technology across different members of the stack for high resiliency.
• IEEE 802.1w Rapid Spanning Tree Protocol (RSTP) provides rapid spanning-tree
convergence independent of spanning-tree timers and benefit of distributed
processing.
• Stacked units behave as a single spanning-tree node.
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Table 1 Product Features and Benefits
Feature Benefit
• Per VLAN Rapid Spanning Tree (PVRST+) allows rapid spanning-tree
reconvergence on a per-VLAN spanning-tree basis, without requiring the
implementation of spanning-tree instances.
• Cisco Hot Standby Router Protocol (HSRP) is supported to create redundant,
failsafe routing topologies.
• Command-switchredundancy enabled in Cisco CMS Softwareallows designation
of a backup command switch that takes over cluster management functions if the
primary command switch fails.
• UniDirectional Link Detection (UDLD) and Aggressive UDLD allow unidirectional
links caused by incorrect fiber-optic wiring or port faults to be detected and
disabled on fiber-optic interfaces.
• Switch port auto-recovery (errdisable) automatically attempts to re-enable a link
that is disabled due to a network error.
• Cisco Redundant Power System 675 (RPS 675) support provides superior
power-source redundancy for up to 6 Cisco networking devices, resulting in
improved fault tolerance and network uptime.
• Equal-cost routing for load balancing and redundancy.
• Bandwidth aggregation up to 8 Gbps through Gigabit EtherChannel technology
and up to 800 Mbps through Fast EtherChannel technology enhances fault
tolerance and offers higher-speed aggregated bandwidth between switches and
to routers and individual servers.
High-performance IP routing • Cisco Express Forwarding hardware routing architecture delivers extremely
high-performance IP routing.
• Basic IP unicast routing protocols (static, Routing Information Protocol Version 1
[RIPv1], and RIPv2) are supported for small-network routing applications.
• IPv6 routing support in hardware for maximum performance in the future.
• Advanced IP unicast routing protocols (Open Shortest Path First [OSPF], Interior
Gateway Routing Protocol [IGRP], Enhanced IGRP [EIGRP], and Border Gateway
Protocol Version 4 [BGPv4]) are supported for load balancing and constructing
scalable LANs. Enhanced Multilayer Software Image (EMI) is required.
• Policy-based routing (PBR) allows superior control by enabling flow redirection
regardless of the routing protocol configured. EMI is required.
• Inter-VLAN IP routing for full Layer 3 routing between 2 or more VLANs.
• Protocol-Independent Multicast (PIM) for IP multicast routing is supported,
including PIM sparse mode (PIM-SM), PIM dense mode (PIM-DM), and PIM
sparse-dense mode. EMI is required.
• Distance Vector Multicast Routing Protocol (DVMRP) tunneling interconnects 2
multicast-enabled networks across non-multicast networks. EMI is required.
• Fallback bridging forwards non-IP traffic between 2 or more VLANs. EMI is
required.
• Routing is enabled across the stack.
• 1000 switch virtual interfaces (SVIs) (depends on the number of routes and
multicast entries) and 468 routed ports are supported per stack.
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Table 1 Product Features and Benefits
Feature Benefit
IntegratedCisco IOS Software
features for bandwidth
optimization
• Per-port broadcast, multicast, and unicast storm control prevents faulty end
stations from degrading overall systems performance.
• WebCache Communication Protocol (WCCP) allows interaction with a Web cache
for the purpose of redirecting content requests and performing basic load
balancing across multiple caches. EMI is required.
• IEEE 802.1d Spanning TreeProtocol support for redundant backbone connections
and loop-free networks simplifies network configuration and improves fault
tolerance.
• PVST+ allows for Layer 2 load sharing on redundant links to efficiently utilize the
extra capacity inherent in a redundant design.
• IEEE 802.1s Multiple Spanning Tree Protocol (MSTP) allows a spanning-tree
instance per VLAN, enabling Layer 2 load sharing on redundant links.
• Equal-cost routing for Layer 3 load balancing and redundancy across the stack.
EMI is required.
• Local Proxy Address Resolution Protocol (ARP) works in conjunction with Private
VLAN Edge to minimize broadcasts and maximize available bandwidth.
• VLAN1 minimization allows VLAN1 to be disabled on any individual VLAN trunk
link.
• VLAN Trunking Protocol (VTP) pruning limits bandwidth consumption on VTP
trunks by flooding broadcast traffic only on trunk links required to reach the
destination devices.
• Internet Group Management Protocol (IGMP) snooping provides fast client joins
and leaves of multicast streams and limits bandwidth-intensive video traffic to
only the requestors.
• Multicast VLAN Registration (MVR) continuously sends multicast streams in a
multicast VLAN while isolating the streams from subscriber VLANs for bandwidth
and security reasons.
• Up to 12 EtherChannel groups are supported per stack.
Scalable stacking • Cisco StackWise stacking creates a 32-Gbps backplane. Stacking does not require
user ports. Up to 9 units can be stacked together for a maximum of 468 10/100
ports, 252 10/100/1000 ports, 108 optical aggregation ports, or any mix thereof.
QoS/Control
Advanced QoS • Cross-stack QoS allows QoS to be configured across the entire stack.
• 802.1p class of service (CoS) and Differentiated Services Code Point (DSCP) field
classification are provided, using marking and reclassification on a per-packet
basis by source and destination IP address, source and destination Media Access
Control (MAC) address, or Layer 4 Transmission Control Protocol/User Datagram
Protocol (TCP/UDP) port number.
• Cisco control-plane and data-plane QoS ACLs on all ports ensure proper marking
on a per-packet basis.
• 4 egress queues per port enable differentiated management of up to 4 traffic
types across the stack.
• Shaped RoundRobin (SRR) scheduling ensures differential prioritization of packet
flows by intelligently servicing the ingress queues and egress queues.
• Weighted Tail Drop (WTD) provides congestion avoidance at the ingress and
egress queues before a disruption occurs.
• Strict priority queuing guarantees that the highest-priority packets are serviced
ahead of all other traffic.
• There is no performance penalty for highly granular QoS functionality.
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