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Cisco · Cisco Catalyst 3750-X Series stackable switches (bulletin shared with 3560-X)

Cisco Catalyst 3750-X end of life

The Cisco Catalyst 3750-X is end of life and has been outside Cisco support since 31 October 2021, the hardware Last Date of Support in Cisco's bulletin EOL10623, which it shares with the 3560-X. Security fixes stopped two years before that, on 30 October 2019. A 2023 Cisco notice carrying a 2028 date applies only to 3750-X software and licence SKUs, not to the switches.

Cisco Catalyst 3750-X support dates

Every row names its basis. A third-party tracker date is not the vendor’s own, and “not published” means exactly that.
MilestoneDateBasisSource
End-of-Life Announcement Date (switches, EOL10623)31 October 2015Vendor-publishedCisco EOL10623 (Amended, updated 26 Jul 2016): End-of-Sale and End-of-Life Announcement for the Cisco Catalyst 3560-X and 3750-X Series Switches
End-of-Sale Date (switches and network/service modules)30 October 2016Vendor-publishedCisco EOL10623 (Amended)
Last Ship Date: HW28 January 2017Vendor-publishedCisco EOL10623 (Amended)
End of SW Maintenance Releases Date: HW30 October 2017Vendor-publishedCisco EOL10623 (Amended)
End of New Service Attachment Date: HW30 October 2017Vendor-publishedCisco EOL10623 (Amended)
End of Vulnerability/Security Support: HW30 October 2019Vendor-publishedCisco EOL10623 (Amended)
End of Service Contract Renewal Date: HW28 January 2021Vendor-publishedCisco EOL10623 (Amended)
Last Date of Support: HW31 October 2021Vendor-publishedCisco EOL10623 (Amended)
Last Date of Support: HW (power supplies, power cords, fan modules, accessory kits and licences, EOL10903)31 October 2021Vendor-publishedEnd-of-Sale for these accessories was also 2016-10-30. EOL10903 has no standalone C3KX-NM network module PIDs; those are in EOL10623.Cisco EOL10903 (updated 2 May 2016): EoS/EoL announcement for Catalyst 3560-X and 3750-X power supplies, cables, and other accessories
End-of-Sale Date: OS SW, License (3750-X software/licence SKUs only, EOL14979)5 September 2023Vendor-publishedCovers only C1-R-C375X-24/48-L-S, LL-3750X-24-USED=, S375XVK9T-15002EZ and S375XVK9TN-15002EZ. Switch hardware is NOT included.Cisco EOL14979 (updated 7 Mar 2023): End-of-Sale and End-of-Life Announcement for the Cisco Catalyst 3750-X Series Switches
Last Date of Support: OS SW (3750-X software/licence SKUs only, EOL14979)30 September 2028Vendor-publishedScope is only the software and licence SKUs listed in EOL14979. The bulletin does not say how this relates to the hardware LDoS. Cisco's support page still shows the series status as 'End of Support', with End-of-Support 31-OCT-2021.Cisco EOL14979

Where the Cisco Catalyst 3750-X stands today

EOL10623 was announced on 31 October 2015 and ended sale of the 3750-X switches and their network and service modules on 30 October 2016, with last shipments on 28 January 2017. Software maintenance releases and new contract attachment ended on 30 October 2017. End of Vulnerability/Security Support followed on 30 October 2019, contract renewals closed on 28 January 2021, and the Last Date of Support arrived on 31 October 2021. Power supplies, power cords, fan modules, accessory kits and licences were retired under a separate bulletin, EOL10903, with the same End-of-Sale date of 30 October 2016 and the same Last Date of Support of 31 October 2021. Cisco's support page records the series, released on 15 March 2010, as 'End of Support'.

A later Cisco notice, EOL14979, needs reading carefully. Published in 2023 under the title 'Catalyst 3750-X Series Switches', it covers only these software and licence SKUs: C1-R-C375X-24/48-L-S, LL-3750X-24-USED=, S375XVK9T-15002EZ and S375XVK9TN-15002EZ. Their End-of-Sale date was 5 September 2023 and their operating-software Last Date of Support is 30 September 2028. Switch hardware is not included, the bulletin does not say how that date relates to hardware support, and Cisco's support page still shows End of Support on 31 October 2021, so the 2028 date should not be read as extended hardware support.

Cisco Catalyst 3750-X: lifecycle on one axis
Cisco Catalyst 3750-X lifecycle timeline20102012201420162018202020222024202620282030Checked 8 Oct 202615 Mar 2010Released31 Oct 2015End-of-Life AnnouncementDate (switches, EOL10623)30 Oct 2016End-of-Sale Date (switchesand network/servicemodules)28 Jan 2017Last Ship Date: HW30 Oct 2017End of SW MaintenanceReleases Date: HW; End ofNew Service AttachmentDate: HW30 Oct 2019End ofVulnerability/SecuritySupport: HW28 Jan 2021End of Service ContractRenewal Date: HW31 Oct 2021Last Date of Support: HW;Last Date of Support: HW(power supplies, powercords, fan modules,accessory kits andlicences, EOL10903)5 Sept 2023End-of-Sale Date: OS SW,License (3750-Xsoftware/licence SKUsonly, EOL14979)30 Sept 2028Last Date of Support: OSSW (3750-Xsoftware/licence SKUsonly, EOL14979)
Dated milestones are placed only where a source gives the date; Blue = vendor-published, amber = third-party tracker, violet = derived from a vendor policy. Checked 8 October 2026.

What still works after Cisco support ends

EOL10623 states that 'Cisco hardware warranty support will be discontinued on the Last Date of Support (LDoS)', so Cisco hardware warranty support ended with it in October 2021. Since that date, Cisco PSIRT has continued to take in vulnerability reports for the 3750-X while declining to analyse, fix or disclose them, and it issues no CVEs for the product. Security fixes had already ended on 30 October 2019, so a 3750-X in service today has been without them for about seven years.

With new service attachment closed since October 2017 and contract renewals since January 2021, hardware cover for 3750-X switches now has to come from outside Cisco. For switches past vendor end of support, network third-party maintenance generally provides fault diagnosis, replacement parts and engineers.

  • Security fixes ended first: End of Vulnerability/Security Support: HW was 2019-10-30, two years before the hardware Last Date of Support. (cisco.com)
  • Since the hardware Last Date of Support (2021-10-31), Cisco PSIRT accepts vulnerability reports but will not analyse, fix or disclose them, and issues no CVEs for the product. (sec.cloudapps.cisco.com)
  • EOL10623: 'Cisco hardware warranty support will be discontinued on the Last Date of Support (LDoS).' (cisco.com)

What a maintenance contract needs to cover on the Cisco Catalyst 3750-X

A 3750-X stack has more parts than its 1 RU height suggests. Models span 24- and 48-port 10/100/1000 switches in data, PoE+ and UPOE versions, plus 12- and 24-port GE SFP models. Uplinks come from modules: the C3KX-NM-1G (four GbE), C3KX-NM-10G (two 10GbE SFP+ plus two SFP), C3KX-NM-10GT (two 10GBASE-T) and the C3KX-SM-10G service module (two 10GbE SFP+ with NetFlow and MACsec). StackWise Plus joins up to nine switches as a single logical unit at 64 Gbps, and StackPower pools power across up to four switches.

Power supplies set the PoE budget, so a maintenance schedule should record the wattage fitted in each switch. The modular options are 350W AC, 715W AC, 1100W AC and 440W DC, with dual redundant supplies supported but only one shipped as standard. A 24-port PoE+ model has 435W of PoE with the 715W supply, 48-port full PoE and UPOE models get 800W with the 1100W supply, and the 1800W UPOE maximum needs the 1100W AC supply in both slots. EOL10903 lists no replacement for these supplies and Cisco no longer sells them, so spares come from the secondary market. Licence level matters too: a stack mixing LAN Base with IP Base or IP Services switches is not supported, so a replacement must not bring a LAN Base unit into an IP Base or IP Services stack, or the reverse.

Cisco Catalyst 3750-X: what to tell a maintenance provider
Cisco Catalyst 3750-X hardware factsCISCO · CISCO CATALYST 3750-X SERIES STACKABLESWITCHES (BULLETIN SHARED WITH 3560-X)Cisco Catalyst 3750-XPast the vendor’s last date ofsupportPORT CONFIGURATIONS24- and 48-port 10/100/1000 in data, PoE+and UPOE versions, plus 12- and 24-port GESFP models; 1 RUPOEPoE+ up to 30W per port; UPOE 60W per port.435W PoE available on 24-port PoE+ modelswith the 715W PSU; 800W with the 1100W PSU(48-port full PoE and UPOE models). MaximumUPOE budget 1800W per switch, whichrequires the 1100W AC PSU in both slots.STACKINGStackWise Plus with 64 Gbps throughput, upto nine switches as a single logical unitSTACKPOWERUp to four switches in a StackPower stack,sharing pooled powerUPLINK NETWORK MODULESC3KX-NM-1G (4x GbE), C3KX-NM-10G (2x 10GbESFP+ + 2x SFP), C3KX-NM-10GT (2x10GBASE-T), C3KX-SM-10G service module (2x10GbE SFP+, NetFlow/MACsec)POWER SUPPLIESModular 350W AC, 715W AC, 1100W AC and 440WDC supplies. Dual redundant power suppliesare supported; the switch ships with oneand a second can be purchased.FEATURE SETSLAN Base, IP Base, IP Services. A mixedstack of LAN Base with IP Base or IPServices switches is not supported.7 sourced specification facts · checked 8 October 2026
The hardware facts a maintenance quote is priced on, printed in the vendor's own wording from its specification documents (cited in Sources). Nothing on this plate is estimated; facts the vendor does not state are left off rather than filled in.
Cisco Catalyst 3750-X hardware, from Cisco’s own specification documents
SpecificationDetailSource
Port configurations24- and 48-port 10/100/1000 in data, PoE+ and UPOE versions, plus 12- and 24-port GE SFP models; 1 RUcisco.com
PoEPoE+ up to 30W per port; UPOE 60W per port. 435W PoE available on 24-port PoE+ models with the 715W PSU; 800W with the 1100W PSU (48-port full PoE and UPOE models). Maximum UPOE budget 1800W per switch, which requires the 1100W AC PSU in both slots.cisco.com
StackingStackWise Plus with 64 Gbps throughput, up to nine switches as a single logical unitcisco.com
StackPowerUp to four switches in a StackPower stack, sharing pooled powercisco.com
Uplink network modulesC3KX-NM-1G (4x GbE), C3KX-NM-10G (2x 10GbE SFP+ + 2x SFP), C3KX-NM-10GT (2x 10GBASE-T), C3KX-SM-10G service module (2x 10GbE SFP+, NetFlow/MACsec)cisco.com
Power suppliesModular 350W AC, 715W AC, 1100W AC and 440W DC supplies. Dual redundant power supplies are supported; the switch ships with one and a second can be purchased.cisco.com
Feature setsLAN Base, IP Base, IP Services. A mixed stack of LAN Base with IP Base or IP Services switches is not supported.cisco.com

Extend or refresh the Cisco Catalyst 3750-X?

Hardware maintenance can keep a 3750-X stack switching and powered, and for a stable, segmented part of the network with a dated replacement plan that may be enough. It does not change the software position: no Cisco security fixes since October 2019, and no vulnerability analysis since October 2021. The longer a stack stays in service, the more that gap counts against it.

Cisco's named path in EOL10623 is the Catalyst 3850, PID for PID, for example WS-C3750X-48P-S to WS-C3850-48P-S. Module replacements need care: for the C3KX-NM-1G, NM-10G and SM-10G, Cisco names 3850 modules but notes 'The replacement product part number will not work with the Catalyst 3750X and 3560X switches', and EOL10623 lists no replacement for the C3KX-NM-10GT. Cisco's support page suggests the Catalyst 9300 Series instead. Whichever you choose, check its own lifecycle first; the Catalyst 3850 end of life and Catalyst 9300 end of life pages set those out.

  • EOL10623 names Catalyst 3850 PIDs as replacements (e.g. WS-C3750X-48P-S to WS-C3850-48P-S). For the C3KX-NM-1G/NM-10G network modules and C3KX-SM-10G service module it names 3850 modules but notes 'The replacement product part number will not work with the Catalyst 3750X and 3560X switches'. C3KX-NM-10GT has no replacement. (cisco.com)
  • Cisco's support page shows status 'End of Support' and suggests the Catalyst 9300 Series. (cisco.com)
  • Power supplies, power cords, fan modules, accessory kits and licences were ended under a separate bulletin (EOL10903), which says there is no replacement for the 3560-X/3750-X power supplies. Cisco no longer sells these parts, so spares now come from the secondary market. (cisco.com)
  • A 2023 bulletin (EOL14979) titled 'Catalyst 3750-X Series Switches' covers only software and licence SKUs, with OS SW Last Date of Support 2028-09-30. Do not read it as extended hardware support. (cisco.com)
Cisco Catalyst 3750-X: what came before and what replaces it
Cisco Catalyst 3750-X product lineageCisco Catalyst 3750-XReleased 15 Mar 2010Past the last date of supportCisco Catalyst 3850(WS-C3850 PID-for-PIDreplacements)Named as the replacement inthe vendor noticeCisco · Cisco Catalyst 3750-X Series stackable switches (bulletin shared with 3560-X)
The successor shown is the one the vendor names in its own end-of-life notice. No predecessor is shown because none could be sourced.

Keep your Cisco Catalyst 3750-X covered

Tell us how many you run and when your current cover ends, and we will come back with a like-for-like maintenance quote for that estate. Your model and its support status are attached to the enquiry automatically, so there is nothing to re-type.

Cisco maintenance in detail →

The 3750-X shares its end-of-life bulletin, EOL10623, with the Catalyst 3560-X, and its accessory bulletin, EOL10903, covers both series too. Its forward path splits between the 3850 that the bulletin names and the 9300 that Cisco's support page suggests. For the 3750-X units an estate still runs, an alternative to Cisco SmartNet is the relevant route, since Cisco no longer offers a contract for them.

Where the Cisco Catalyst 3750-X sits against related models
Cisco Catalyst 3750-X: end of support passed 4.9 years ago (31 October 2021, the vendor’s date).20102012201420162018202020222024202620282030Cisco Catalyst 3750-XCatalyst 3850Catalyst 2960-XCatalyst 3650ISR 4000 SeriesCatalyst 9300Catalyst 9200TodayCisco Catalyst 3750-X: end of support passed 4.9 years ago (31 October 2021, the vendor’s date).
Each bar runs from release to the milestone that marks end of support for the model as a whole. Amber bars end on a third-party tracker's date, not the vendor's. A dashed open end means no end date is published — not that support is indefinite. Component and accessory dates (a management controller, a power module) are not treated as the model's.

Look up another model in the server & network end-of-life checker, or read what third-party maintenance covers.

Questions people ask about the Cisco Catalyst 3750-X

Is the Cisco Catalyst 3750-X end of life?

Yes. Cisco ended sale of the 3750-X on 30 October 2016, and its hardware Last Date of Support was 31 October 2021 under bulletin EOL10623. Cisco's support page lists the 3750-X with the status 'End of Support'.

When did security updates stop for the 3750-X?

End of Vulnerability/Security Support for 3750-X hardware was 30 October 2019, two years before the Last Date of Support. After the Last Date of Support on 31 October 2021, reports sent to Cisco PSIRT about the 3750-X are accepted, yet Cisco will not analyse, fix or disclose them, and it issues no CVEs for the product.

Does EOL14979 extend Catalyst 3750-X support to 2028?

Not for the hardware. EOL14979 covers only a short list of software and licence SKUs, and 30 September 2028 is the operating-software Last Date of Support for those SKUs. The bulletin does not say how it relates to hardware support, and Cisco's support page still shows End of Support on 31 October 2021.

What replaced the Catalyst 3750-X?

EOL10623 names Catalyst 3850 switches as PID-for-PID replacements, such as the WS-C3850-48P-S for the WS-C3750X-48P-S. Cisco's support page suggests the Catalyst 9300 Series.

Can I get third-party maintenance for a 3750-X stack?

A quote can be requested; third-party maintenance generally covers diagnosis, replacement parts and engineers for switches past vendor support. List each switch's PID, power supply wattage, uplink module and feature set (LAN Base, IP Base or IP Services), because a stack mixing LAN Base with IP Base or IP Services is not supported.

Sources

Every date, rule and specification above was checked against these on 8 October 2026 by an independent verification pass. Vendors revise lifecycle notices; this page is re-checked by 8 January 2027.

  1. Cisco EOL10623 (Amended, updated 26 Jul 2016): End-of-Sale and End-of-Life Announcement for the Cisco Catalyst 3560-X and 3750-X Series Switches — cisco.com
  2. Cisco EOL10903 (updated 2 May 2016): EoS/EoL announcement for Catalyst 3560-X and 3750-X power supplies, cables, and other accessories — cisco.com
  3. Cisco EOL14979 (updated 7 Mar 2023): End-of-Sale and End-of-Life Announcement for the Cisco Catalyst 3750-X Series Switches — cisco.com
  4. Cisco Catalyst 3750-X release — cisco.com
  5. sec.cloudapps.cisco.com — sec.cloudapps.cisco.com
  6. cisco.com — cisco.com

Last reviewed 7 October 2026. Lifecycle dates for the Cisco Catalyst 3750-X are re-verified against Cisco's own notices at each review; a date a vendor has not published is never filled in.