Cisco Systems 3750-48PS, 3750-24PS User Manual

Data Sheet

Cisco Catalyst 3750 Series Switches

The Cisco® Catalyst® 3750 Series Switches (Figures 1 through 4) are innovative switches
that improve LAN operating efficiency by combining industry-leading ease of use and high
resiliency for stackable switches. This product series features Cisco StackWise™
technology, a 32-Gbps stack interconnect that allows customers to build a unified, highly
resilient switching system, one switch at a time.

Figure 1. Cisco Catalyst 3750 Series Switches for 10/100 and 10/100/1000 Access and Aggregation

Figure 2. Cisco Catalyst 3750-24PS and Cisco Catalyst 3750-48PS Switches with IEEE 802.3af Power

Figure 3. Cisco Catalyst 3750G-16TD Switch

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Data Sheet

Figure 4. Cisco Catalyst 3750G-48TS Switch, Cisco Catalyst 3750G-48PS Switch with IEEE 802.3af

Power, Cisco Catalyst 3750G-24TS-1U Switch, and Cisco Catalyst 3750G-24PS Switch with IEEE

802.3af Power

PRODUCT OVERVIEW

For midsized 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 optimized for high­density Gigabit Ethernet deployments and includes a diverse range of switches that meet access,
aggregation, or small-network backbone-connectivity requirements.

CONFIGURATIONS

The Cisco Catalyst 3750 Series includes the following configurations:

●

Cisco Catalyst 3750G-24TS-24 Ethernet 10/100/1000 ports and four Small Form-Factor
Pluggable (SFP) uplinks

●

Cisco Catalyst 3750G-24T-24 Ethernet 10/100/1000 ports

●

Cisco Catalyst 3750G-12S-12 Gigabit Ethernet SFP ports

●

Cisco Catalyst 3750-48TS-48 Ethernet 10/100 ports and four SFP uplinks

●

Cisco Catalyst 3750-24TS-24 Ethernet 10/100 ports and two SFP uplinks

●

Cisco Catalyst 3750-48PS-48 Ethernet 10/100 ports with IEEE 802.3af and Cisco
prestandard Power over Ethernet (PoE) and four SFP uplinks

●

Cisco Catalyst 3750-24PS-24 Ethernet 10/100 ports with IEEE 802.3af and Cisco
prestandard PoE and two SFP uplinks

●

Cisco Catalyst 3750-24FS-24 100BASE-FX Ethernet ports and two SFP uplinks

●

Cisco Catalyst 3750G-16TD-16 Gigabit Ethernet 10/100/1000 ports and one 10 Gigabit
Ethernet XENPAK uplink

●

Cisco Catalyst 3750G-24TS-1U-24 Ethernet 10/100/1000 ports and four SFP uplinks, 1­rack unit (RU) height

●

Cisco Catalyst 3750G-24PS-24 Ethernet 10/100/1000 ports with IEEE 802.3af and Cisco
prestandard PoE and four SFP uplinks

●

Cisco Catalyst 3750G-48TS-48 Ethernet 10/100/1000 ports and four SFP uplinks

●

Cisco Catalyst 3750G-48PS-48 Ethernet 10/100/1000 ports with IEEE 802.3af and Cisco
prestandard PoE and four SFP uplinks

●

Cisco Catalyst 3750G-24WS-24 Ethernet 10/100/1000 ports with IEEE 802.3af, Cisco
prestandard PoE and two SFP uplinks and an integrated wireless LAN controller

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Data Sheet

The Cisco Catalyst 3750 Series is available with either the IP Base image or the IP Services
image. The IP Base image feature set includes advanced quality of service (QoS), rate-limiting,
access control lists (ACLs), and basic static and Routing Information Protocol (RIP) routing
capability. The IP Services image provides a richer set of enterprise-class features, including
advanced hardware-based IP unicast and multicast routing.

An additional Advanced IP Services license is also available. This license is required for IPv6
routing (Layer 3 switching).

Cisco StackWise Technology offers Stackable Resiliency

Cisco StackWise technology is a stacking architecture optimized for Gigabit Ethernet. This
technology is designed to respond to additions, deletions, and redeployment while maintaining
constant performance. Cisco StackWise technology unites up to nine individual switches into
a single logical unit, using special stack-interconnect cables and stacking software. The individual
switches can be any combination of Cisco Catalyst 3750 and Cisco Catalyst 3750-E Series
Switches. 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.

PRIMARY FEATURES AND BENEFITS

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 loads the Cisco IOS® Software revision running on the stack to
the new switch, loads the global configuration parameters, and updates all the routing tables to
reflect changes. Upgrades are applied universally and simultaneously to all members of the stack.

The Cisco Catalyst 3750 Series stacks up to nine switches as a single logical unit for a total of 468
Ethernet or PoE 10/100 ports, or 468 Ethernet 10/100/1000 ports or PoE 10/100/1000 ports, or
nine 10 Gigabit Ethernet ports. Additional port combinations can be created by connecting
the Cisco Catalyst 3750-E Series Switches to the stack. Individual 10/100, 10/100/1000, and 10
Gigabit Ethernet units can be joined in any combination to evolve with network needs.

Return on Investment Through Lower Operations Costs

The automatic Cisco IOS Software version checking and loading of the global configuration
parameters provide the first level of operational time saving. The second level is added during
the event of an outage. When you remove a troubled switch from an existing stack of switches and
replace it with another switch, the master switch will recognize this as a maintenance outage and
automatically reload the port-level configuration that was on the previous switch without user
intervention. This allows IT managers to have local personnel in remote locations perform
maintenance tasks instead of sending costly technicians out for a few minutes of work, thus saving
thousands of dollars in operational costs.

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Data Sheet

Mix-and-Match Switch Types: Pay as You Expand Your Network

Stacks can be created with any combination of Cisco Catalyst 3750 and Cisco Catalyst 3750-E
switches. Customers who need a mixture of 10/100 and 10/100/1000 ports, PoE, and wiring-closet
aggregation capability can incrementally develop the access environment, paying only for what
they need. When uplink capacity needs to be increased, you can easily upgrade your bandwidth
by adding a 10 Gigabit Ethernet version to the stack and upgrade your Gigabit Ethernet links with
10 Gigabit Ethernet on the existing fiber.

Integrated Wireless LAN Controller

The Cisco Catalyst 3750G Integrated Wireless LAN Controller integrates wireless LAN controller
functions into the Cisco Catalyst 3750G Series Switches and delivers improved operating
efficiency and WLAN security, mobility, and ease of use for business-critical wireless LANs. The
Cisco Catalyst 3750G Integrated Wireless LAN Controller delivers centralized security policies,
wireless intrusion prevention system (IPS) capabilities, award-winning RF management, QoS, and
Layer 3 fast secure roaming for WLANs. As a core component of the Cisco Unified Wireless
Network, the Cisco Catalyst 3750G Integrated Wireless LAN Controller provides the control,
security, redundancy, and reliability that network managers need to scale and manage their
wireless networks as easily as they scale and manage their traditional wired networks.

Availability: Uninterrupted Performance at Layer 2 and Layer 3

The Cisco Catalyst 3750 Series increases availability for stackable switches. Each switch can
operate as both a master controller and a forwarding processor. Each switch in the stack can
serve as a master, creating a 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 onto 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-E and 3750 Series offer Gigabit and 10 Gigabit Ethernet speed with
intelligent services that keep everything flowing smoothly, even at 10 times the normal network
speed. Mechanisms for marking, classification, and scheduling deliver best-in-class performance
for data, voice, and video traffic, all at wire speed.

Network 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. This set of comprehensive features not only helps prevent
external attacks, but also defends the network against “man-in-the-middle” attacks, a primary
concern in today’s business environment.

Single IP Management: Many Switches, One Address

Each Cisco Catalyst 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, VLAN creation and
modification, network security, and QoS controls.

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Data Sheet

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. All Cisco Catalyst 3750-E
Series switch models also support jumbo frames.

IPv6 Support

The Cisco Catalyst 3750 Series supports IPv6 routing in hardware for maximum performance. As
network devices grow and the need for larger addressing and higher security becomes critical,
the Cisco Catalyst 3750 Series will be ready to meet the requirement.

Standard PoE Support: Graceful Addition of IP Communications

The Cisco Catalyst 3750 and 3750G PoE models support Cisco IP phones and Cisco Aironet®
wireless LAN (WLAN) access points, as well as any IEEE 802.3af-compliant end device. The
Cisco Catalyst 3750 and 3750G 24-port versions can support 24 simultaneous full-powered PoE
ports at 15.4W for maximum powered device support. The 48-port versions can deliver the
necessary power to support 24 ports at 15.4W, 48 ports at 7.7W, or any combination in between.

10 Gigabit Ethernet Support: Increased Uplink Bandwidth for Gigabit Ethernet Deployments

The Cisco Catalyst 3750 Series allows network managers to incrementally add IEEE 802.3ae­compliant 10 Gigabit Ethernet connectivity in their wiring closets or grid clusters, further facilitating
and enhancing Gigabit Ethernet networks. This provides investment protection to customers who
want to use their existing fiber plant, add uplink bandwidth capacity to their switching stacks, and
provide higher performance to applications and users. The Cisco Catalyst 3750-E Series offers
an even greater variety of 10 Gigabit Ethernet port configuration switches.

Management Options

The Cisco Catalyst 3750 Series (Figure 5) offers both a superior command-line interface (CLI) for
detailed configuration and Cisco Network Assistant Software, a Web-based tool for quick
configuration based on preset templates. In addition, CiscoWorks supports the Cisco Catalyst
3750 Series for networkwide management. Table 1 lists the features and benefits of the Cisco
Catalyst 3750 Series.

Figure 5. Cisco Catalyst 3750 Series Switches

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Table 1. Features and Benefits

Feature Benefit

Ease of
Use and
Deployment

Availability and Scalability
Superior

Redundancy
for Fault
Backup

●

Autoconfiguration of new stack units eliminates reconfiguration.

●

Dynamic Host Configuration Protocol (DHCP) autoconfiguration of multiple switches through a boot
server eases switch deployment.

●

Automatic Cisco IOS Software version checking and updating help 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 help enable
egress queue configuration.

●

Master configuration management helps ensure that all switches are automatically upgraded when the
master switch receives a new software version.

●

Autosensing 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.

●

Autonegotiating on all ports automatically selects half- or full-duplex transmission mode to optimize
bandwidth.

●

Dynamic Trunking Protocol (DTP) facilitates 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.

●

There is a default configuration to help ensure that the switch can be quickly connected to the network
and can pass traffic with minimal user intervention. This default configuration exists even if there is no
configuration stored in Flash memory.

●

Automatic media-dependent interface crossover (MDIX) automatically adjusts transmit and receive
pairs if an incorrect cable type (crossover or straight-through) is installed.

●

1:N master redundancy allows each stack 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 also offers the benefit of distributed processing.

●

Stacked units behave as a single spanning-tree node.

●

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.

●

Unidirectional Link Detection Protocol (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 autorecovery (errdisable) automatically attempts to reactivate a link that is disabled
because of a network error.

●

Cisco RPS 2300 and RPS 675 Redundant Power Systems 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 16 Gbps through 10 Gigabit EtherChannel technology, 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.

●

Uplink bandwidth can be easily upgraded by adding a 10 Gigabit Ethernet version to a wiring-closet
stack and replacing the Gigabit Ethernet uplinks with 10 Gigabit Ethernet without having to change
fiber pairs.

Data Sheet

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Feature Benefit

High­Performance
IP Routing

Integrated
Cisco IOS
Software
Features
for Bandwidth
Optimization

Scalable
Stacking

QoS and Control
Advanced QoS ● Cross-stack QoS allows QoS to be configured across the entire stack.

●

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. The Advanced IP Services License is
required.

●

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. The IP Services image is required.

●

Policy-based routing (PBR) allows superior control by facilitating flow redirection regardless of the
routing protocol configured. The IP Services image is required.

●

HSRP provides dynamic load balancing and failover for routed links; up to 32 HSRP links supported
per unit or stack.

●

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. The IP Services image is
required.

●

Distance Vector Multicast Routing Protocol (DVMRP) tunneling interconnects 2 multicast-enabled
networks across nonmulticast networks. The IP Services image is required.

●

Fallback bridging forwards non-IP traffic between 2 or more VLANs. The IP Services image is
required.

●

Routing is possible across the stack.

●

128 switch virtual interfaces (SVIs) are recommended. Maximum of 1000 are supported (depending on
the number of routes and multicast entries). 468 routed ports are supported per stack.

●

Per-port broadcast, multicast, and unicast storm control prevents faulty end stations from degrading
overall systems performance.

●

IEEE 802.1d Spanning Tree Protocol 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 use the extra capacity inherent
in a redundant design.

●

IEEE 802.1s Multiple Spanning Tree Protocol allows a spanning-tree instance per VLAN, for Layer 2
load sharing on redundant links.

●

Equal-cost routing facilitates Layer 3 load balancing and redundancy across the stack. The IP
Services image 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 48 EtherChannel groups are supported per stack.

●

Cisco StackWise stacking creates a 32-Gbps switch interconnection. Stacking does not require user
ports. Up to 9 units can be stacked together for a maximum of 468 10/100 ports, 468 10/100/1000
ports, 108 optical aggregation ports, nine 10 Gigabit Ethernet ports, or any mix thereof. Additional port
combinations can be created by stacking together the Cisco Catalyst 3750 Series Switches and the
Cisco Catalyst 3750-E Series Switches.

●

802.1p class of service (CoS) and differentiated services code point (DSCP) field classification is
provided, using marking and reclassification on a per-packet basis by source and destination IP
address, source and destination 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 help ensure proper marking on a per­packet basis.

●

4 egress queues per port help enable differentiated management of up to 4 traffic types across the
stack.

●

Shaped Round Robin (SRR) scheduling helps ensure 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 helps ensure that the highest-priority packets are serviced ahead of all other
traffic.

●

There is no performance penalty for highly granular QoS capability.

Data Sheet

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