Cisco ISR4351/K9 End of Life & End of Support
Cisco ISR 4351 Integrated Services Router
Supported through Nov 30, 2028High-density ISR 4000 router with multiple NIM and SM slots that replaced the 2951/3900-series. Cisco's bulletin migrates it to the Catalyst 8300 (C8300-2N2S-6T).
Cisco ISR4351/K9 lifecycle milestone dates
- End-of-Sale Date
- Nov 7, 2023
- End of Software Maintenance
- Aug 31, 2025
- Last Date of Support (LDoS)
- Nov 30, 2028
Dates per Cisco’s official End-of-Sale/End-of-Life bulletin. Verify against your support contract before acting.
Running past End-of-Sale or Last Date of Support means no new Cisco TAC, hardware replacement, or security fixes. Uniqcli, an authorized Cisco partner, scopes a like-for-like or better replacement, confirms TAA compliance, accepts the Government Purchase Card (GPC), and plans a low-risk cutover.
Compare ISR4351/K9 vs its replacement → · Prefer to keep it running? Renew SmartNet / support instead →
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Frequently asked questions
When is the Cisco ISR4351/K9 end of life?
Cisco announced End-of-Sale for the ISR4351/K9 effective Nov 7, 2023. The Last Date of Support (LDoS) is Nov 30, 2028, after which Cisco no longer provides support. Check the milestone dates on this page and plan your refresh accordingly.
What replaces the Cisco ISR4351/K9?
Cisco's recommended migration is the Cisco Catalyst C8300-2N2S-6T Edge Platform. Uniqcli, an authorized Cisco partner, can quote the replacement TAA-compliant and GPC-payable, and help plan the cutover.
Can I still get support for the ISR4351/K9?
Yes, until the Last Date of Support (Nov 30, 2028) with an active SmartNet/Solution Support contract. Uniqcli can review your install base, confirm coverage, and quote a refresh.