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WS-C3850-12S-S
Cisco WS-C3850-12S-S Catalyst 3850 12-Port Gigabit Fiber Swi...
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WS-C3850-12S-S is a managed Layer 3 fiber access switch with 12 fixed 1G SFP ports and the IP Base feature set in a 1U rack-mount chassis. Its uplink architecture is modular, with an empty bay for a separately selected SFP or SFP+ network module rather than installed uplink ports. The Catalyst 3850 serves enterprise access and branch fiber aggregation, including connections from smaller access switches where fiber links are required. This is a non-PoE configuration, so connected equipment needs its own power source. The discontinued WS-C3850-12S-E shares the fixed fiber-port configuration but carries IP Services for advanced routing requirements.
WS-C3850-12S-S price for new stock is $1,441.65, a 92% saving from the Cisco list price of $17,967.00. WS-C3850-12S-S refurb price is $166.95. WS-C3850-12S-S is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for WS-C3850-12S-S for additional pricing. Browse the full Cisco 3850 Catalyst Switches series or explore all Cisco products.
68 Gbps switching capacity provides the forwarding fabric for the fixed interfaces and permitted uplink configuration. 50.5 Mpps forwarding rate applies with C3850-NM-2-10G providing two 10G and two 1G uplink connections. OSPF for routed access, EIGRP Stub, RIPv1, RIPv2, RIPng, static routing and PBR are available under IP Base; full OSPF, EIGRP, BGPv4 and IS-ISv4 require IP Services. The hardware accommodates 32000 MAC entries and a 24000-entry IPv4 route capacity that counts ARP plus learned routes. WS-C3850-12S-S uses 4 GB DRAM and 2 GB flash for runtime operation and image storage. Cisco IOS XE provides the CLI, while Cisco Prime Infrastructure handles centralized provisioning and monitoring. DHCP snooping and Dynamic ARP Inspection provide access-security controls, and MSTP or PVRST+ handles spanning-tree operation. The Cisco Catalyst 3850 uses UADP forwarding silicon to apply switching and policy functions in hardware, while the purchased feature set determines which routing functions are available.
WS-C3850-12S-S is available from ORM Systems new sealed or certified refurbished, with up to a 3-year extended warranty for new units, up to 1 year for certified refurbished units, and 30-day returns on every condition; terms apply. Certified refurbished units are inspected and bench-tested for rated-speed port links, clean boot and optics bay recognition; firmware is verified and the configuration is wiped to factory default. Specify condition and confirm the itemized accessories before submitting the purchase order. For enterprise and volume orders, ORM Systems accepts POs, offers Net-30 for government and RMA with advance replacement, and supports regional stock and RMA across the UK, EU, US and MEA.
| Key Specs | Key Spec Values |
|---|---|
Operating System | Cisco IOS XE |
License Tier | IP Base |
Port Configuration | 12 x 1G SFP / modular uplink bay |
Replaces | WS-C3750X-12S-S / end of sale October 30, 2016 |
Lifecycle Status | End of sale April 30, 2022 |
Replacement PID | C9300-24S |
In a multi-building enterprise campus, IT architects deploy the WS-C3850-12S-S as the distribution-layer switch to terminate 12 GE SFP fiber uplinks from building-level access switches. This configuration delivers business-critical, non-blocking 10 Gbps aggregation, redundant uplink paths via StackWise-480, and unified policy enforcement with Cisco IOS IP Base. Outcome: 5× improved backbone throughput, sub-millisecond failover, and 99.99 % campus-wide network availability.
In a modular data center, the WS-C3850-12S-S serves as a leaf-node switch for server racks running virtualization and container workloads. Leveraging 12 high-speed GE SFP ports and native IPv4/IPv6 routing in IOS IP Base, IT teams achieve low-latency east-west traffic, automated VXLAN segmentation, and simplified network fabric management with Cisco DNA Center. Outcome: 30 % reduction in application response times, seamless workload mobility, and streamlined network operations.
A distributed retail chain uses the WS-C3850-12S-S at each branch to aggregate multiple fiber-delivered WAN circuits (MPLS, DIA, LTE failover) into a single router-on-a-stick architecture. Integrated Cisco TrustSec and advanced QoS in the IP Base image ensure secure segmentation and prioritized voice/data services. Outcome: 40 % lower WAN costs through link bundling, zero-touch provisioning with Cisco Plug-and-Play, and end-to-end policy compliance across 200+ locations.
An installed WS-C3750X-12S-S requiring a legacy hardware refresh has WS-C3850-12S-S as its named replacement. Treat the job as a compatibility-led purchase rather than a move to a new switching family. Before the PO, inventory the existing optics, rack hardware and licensed routing requirements, then specify the replacement unit and any changed accessories.
An existing Catalyst 3850 stack needing additional fiber connections can incorporate this member through the 480 Gbps StackWise-480 interconnect. Treat data stacking and shared power as separate order items because their connections perform different functions. Before the PO, confirm the stack topology, available positions and the exact interconnect hardware required.
A branch consolidation project needing multiple VLAN interfaces can use the hardware's 1000-SVI capacity as a sizing reference. That interface count does not expand the routing functions included with the purchased feature set. Before the PO, record the required routed interfaces and features, then match the installed software entitlement to that requirement.
10G fiber access connections
WS-C3850-12S-S fixed SFP access ports operate at 1G. C9300X-12Y provides 12 SFP28 access ports supporting 1G, 10G and 25G for higher-speed fiber connections.
Powered copper endpoint connections
WS-C3850-12S-S has no RJ-45 access ports or PoE output. C9300-24P-E provides 24 Gigabit copper PoE+ ports, changing both connection type and port density.
Cisco service beyond April 2027
WS-C3850-12S-S reaches its last Cisco support date on April 30, 2027. C9300-24S is the current migration replacement, with 24 rather than 12 fixed 1G SFP ports.
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| WS-C3850-12S-S |  WS-C3850-48U-S |  WS-C3850-24U-L |  WS-C3850-24XU-S | |
|---|---|---|---|---|
| Depth | 450 mm | 488 mm | 488 mm | 488 mm |
| Ethernet Technology | Gigabit Ethernet | Gigabit Ethernet | Gigabit Ethernet | Multi-Gigabit (2.5G/5G) |
| Flash Memory | 2 GB | 2 GB | 2 GB | 2 GB |
| Form Factor | Rack-Mount 1U | Rack-Mount 1U | Rack-Mount 1U | Rack-Mount 1U |
| Height | 44.5 mm | 44.5 mm | 44.5 mm | 44.5 mm |
| Manufacturer Part Number | WS-C3850-12S-S | WS-C3850-48U-S | WS-C3850-24U-L | WS-C3850-24XU-S |
| Memory | 4 GB | 4 GB | 4 GB | 4 GB |
| Power Consumption | 90.04W with C3850-NM-2-10G at 100% traffic | 127.7W (excluding PoE load / tested with C3850-NM-4-10G) | 84.8W (excluding PoE load / C3850-NM-2-10G installed) | 248.1W (100% IMIX traffic / no PoE load / C3850-NM-8-10G installed) |
| Switching Capacity | 68 Gbps | 176 Gbps | 92 Gbps | 640 Gbps |
| Weight | 7.02 kg | 8 kg. | 7.5 kg | 8 kg |
| Width | 445 mm | 445 mm | 445 mm | 445 mm |
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Reviewed on the 2 September 2022
Compact SFP switch delivered reliable fiber access performance.
Reviewed on the 10 February 2024
LAN Base features met our access requirements well.
Reviewed on the 19 August 2020
Stable operation with simple configuration.
Reviewed on the 31 May 2023
Cisco reliability in a small footprint.
Reviewed on the 21 February 2025
Good choice for fiber-based access deployments.
WS-C3850-12S-S identifies a Catalyst 3850 stackable switch with 12 Gigabit Ethernet SFP ports and IP Base. WS-C3850 names the switch family, 12 identifies the port count, the first S denotes SFP ports, and the final S denotes IP Base. The base configuration includes PWR-C1-350WAC.
WS-C3850-12S-S supports Cisco IOS XE CLI management, SSH or Telnet access, SNMPv1, SNMPv2c, SNMPv3 and Cisco Prime Infrastructure; Cisco DNA Center provides package-based automation and management. SSH and encrypted SNMPv3 require the cryptographic software image. Specify the intended management method and associated software entitlements before ordering.
WS-C3850-12S-S ended Cisco sales on April 30, 2022, and reaches its last date of support on April 30, 2027. Software maintenance releases ended April 30, 2023; vulnerability and security support ends April 30, 2027. C9300-24S is the current replacement, with 24 fixed 1G SFP ports.
ORM Systems offers WS-C3850-12S-S new sealed with up to a 3-year extended warranty or certified refurbished with up to 1 year. Every condition carries 30-day returns; terms apply. Cisco's Enhanced Limited Lifetime Warranty is original-owner coverage, bounded by the last support date of April 30, 2027.
WS-C3850-12S-S includes IP Base, with RTU upgrades to IP Services through C3850-12-S-E or L-C3850-12-S-E. Optional Cisco DNA Essentials and Cisco DNA Advantage add-ons start at three years and use Smart Accounts; expiration leaves base capabilities after deactivation and reload. Cisco ONE Software offers a separate suite-based purchase path.
WS-C3850-12S-S replaces the discontinued WS-C3750X-12S-S, whose end-of-sale date was October 30, 2016. That replacement preserves a 12-port Gigabit SFP configuration with IP Base rather than changing to copper access ports. WS-C3850-12S-S is itself discontinued, and its current migration replacement is the 24-port C9300-24S.
WS-C3850-12S-S accepts C3850-NM-4-1G for four Gigabit SFP uplinks or C3850-NM-2-10G for supported Gigabit and 10G combinations. The base switch ships with an empty uplink bay. C3850-NM-4-10G is not supported on this 12-port Gigabit model, so specify a permitted module and compatible optics separately.
Catalyst 3850 StackWise-480 stacks nine members using a 480 Gbps interconnect and presents a single management IP address. STACK-T1-50CM=, STACK-T1-1M= and STACK-T1-3M= provide the available cable lengths. Members must use compatible feature sets; a mixed LAN Base and IP Base or IP Services stack is unsupported.
Catalyst 3850 IP Base supports static routing, RIPv1, RIPv2, RIPng, EIGRP Stub, OSPF for routed access and PBR. Full OSPF, EIGRP, BGPv4, IS-ISv4 and VRF-Lite require IP Services. The 24000-entry IPv4 hardware capacity includes ARP plus learned routes and does not remove feature-set restrictions.
No, WS-C3850-12S-S ships with one PWR-C1-350WAC supply and an empty second power-supply bay. Redundancy is optional rather than included in the base configuration. A second PWR-C1-350WAC can populate the additional bay, while StackPower provides a separate power-sharing arrangement that needs its own connections.
WS-C3850-12S-S includes IP Base, while WS-C3850-12S-E includes IP Services for full OSPF, EIGRP, BGPv4 and IS-ISv4. Both are discontinued fiber models with support ending April 30, 2027. The IP Base version suits installed routed-access requirements; the IP Services version suits legacy replacements requiring advanced routing.
WS-C3850-12XS-S provides 12 fixed 1G/10G SFP+ ports, whereas WS-C3850-12S-S provides 12 fixed 1G SFP ports. Both are discontinued IP Base models with support ending April 30, 2027. The Gigabit version suits existing 1G fiber connections; the SFP+ version suits legacy replacements requiring 10G access connections.
C9300-24S provides 24 fixed 1G SFP ports, compared with 12 on WS-C3850-12S-S, and is the current replacement for the discontinued model. Both use modular uplinks. WS-C3850-12S-S suits maintaining an installed legacy configuration; C9300-24S suits migration orders needing the current replacement and twice the fixed fiber-port density.
WS-C3850-12S-S reaches 90.04W with C3850-NM-2-10G at 100% traffic under 115V AC, 60 Hz testing. The C3850-NM-4-1G configuration reaches 86.75W under the same traffic condition. These figures describe specific tested configurations; the PWR-C1-350WAC supply rating is not the switch's operating consumption.
WS-C3850-12S-S is a 1U rack-mount switch measuring 44.5 mm high, 445 mm wide and 450 mm deep, with a 7.02 kg chassis weight. The chassis weight excludes the uplink module. Reserve space for the installed configuration and specify suitable mounting hardware alongside the switch.
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