Cisco Catalyst 3750

Cisco Catalyst 3750 is a legacy stackable switching family designed for enterprise access, branch networks, wiring closets, IP telephony, wireless access points, and Layer 2/Layer 3 connectivity. The series includes standard 3750, Gigabit-focused 3750G, 3750V2, and later related generations with different hardware and licensing characteristics.

For existing environments, the main requirement is usually not building a new 3750 network. Buyers are more often looking for a matching replacement switch, the correct software feature level, PoE capacity, stacking components, optics, or a migration path toward a newer Catalyst platform. Cisco lists the original Catalyst 3750 Series as end of support and recommends considering Catalyst 9300 for modernization.

Series Highlights

• Stackable enterprise campus and branch switching
• 24- and 48-port configurations
• Fast Ethernet and Gigabit Ethernet models
• PoE options for phones and wireless access points
• Cisco StackWise architecture
• IP Base and IP Services software feature sets
• Layer 2 and advanced Layer 3 options
• Legacy platform requiring lifecycle and migration review

Cisco Catalyst 3750 At a glance

What it is: Legacy stackable enterprise access-switch family

Product family: Cisco Catalyst License

Typical use: Campus access, branch switching, IP phones, wireless APs, VLAN routing, and wiring-closet aggregation

Main software levels: IP Base and IP Services, with licensing varying by generation

Ordering scope: Switch model, port type, PoE, software image, stacking, uplinks, power, optics, and lifecycle status

Current status: Retired; exact support milestones vary by model and generation

Series Overview

Catalyst 3750 was built around Cisco StackWise technology, allowing as many as nine compatible switches to operate as a single logical unit. Original 3750 platforms use a 32-Gbps stacking architecture, helping administrators expand port capacity while keeping one management view for VLANs, QoS, security, and fault handling. The family includes 10/100 and Gigabit Ethernet models, fiber variants, and PoE switches. Cisco 3750 and 3750G PoE models can power IP phones, Aironet access points, and other IEEE 802.3af devices.

Licensing and Part Number Guidance

For many standard Catalyst 3750 and 3750G models, Cisco used IP Base and IP Services software images within the broader Cisco License framework. IP Base provides common enterprise access features, QoS, ACLs, static routing, RIP, and EIGRP stub capabilities. IP Services extends this with more advanced IPv4/IPv6, multicast, and dynamic-routing functions such as OSPF and BGP.

Part-number suffixes often indicate the software level. For example, many -S models were supplied with IP Base, while corresponding -E models included IP Services. Upgrade kits such as CD-3750-EMI= and related 3750G licenses were also offered for moving supported standard models to advanced routing capabilities.

Later Catalyst 3750-X models introduced LAN Base alongside IP Base and IP Services and used Cisco IOS software activation. Because licensing changed between generations, the exact SKU should always be identified before assuming that a 3750 license or upgrade applies.

Common Use Cases

Models, Licenses, and Ordering Scope

What to Check Before Requesting a Quote

Start with the complete switch part number rather than “Catalyst 3750” alone. Confirm the current software image, number and type of ports, PoE requirement, stack membership, uplinks, and any missing accessories. Lifecycle is particularly important. Cisco lists the core Catalyst 3750 Series as end of sale on May 14, 2016 and end of support on July 31, 2023, although individual models reached retirement on different dates. Specific 3750-X software and license SKUs have separate lifecycle milestones, so their status should be checked independently.

Activation and Delivery Notes

Older Catalyst 3750 models may use software images or upgrade entitlements rather than the Smart Licensing workflows found on newer Catalyst platforms. Catalyst 3750-X introduced license-file-based software activation for LAN Base, IP Base, and IP Services. For replacement hardware, verify IOS version, feature set, stack compatibility, and configuration before adding the switch to production. Do not assume two switches carrying the 3750 name are operationally interchangeable.