{"product_id":"l-fl-4350-hsec-k9","title":"Cisco L-FL-4350-HSEC-K9 | High Security License for 4351 | E-Delivery","description":"\u003cdiv class=\"product-desc\"\u003e\n\u003c!-- Section: About This Product --\u003e\n\u003cdiv style=\"margin-bottom: 32px;\"\u003e\n\u003ch2 style=\"font-size: 16px; font-weight: bold; color: #1a1a1a; border-bottom: 2px solid #e8e8e8; padding-bottom: 10px; margin: 0 0 16px 0; letter-spacing: 0.01em;\"\u003eAbout This Product\u003c\/h2\u003e\n\u003ch3 style=\"font-size: 14px; font-weight: 600; color: #1a1a1a; margin: 0 0 10px 0;\"\u003eBuy Cisco L-FL-4350-HSEC-K9 | ISR 4351 High Security (HSEC) Feature License | E-Delivery\u003c\/h3\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0 0 14px 0;\"\u003eThe \u003cstrong\u003eL-FL-4350-HSEC-K9\u003c\/strong\u003e is a \u003cstrong\u003eCisco ISR 4351 High Security (HSEC) Feature License\u003c\/strong\u003e — the critical upgrade that removes export-restricted crypto throughput caps and enables unlimited IPsec tunnel capacity on the highest-performance Cisco ISR 4351 Integrated Services Router. This \u003cstrong\u003eCisco ISR 4351 HSEC license\u003c\/strong\u003e unlocks the full hardware crypto engine of the ISR 4351, eliminating the default tunnel count and throughput limitations for enterprise and carrier-grade VPN deployments.\u003c\/p\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0;\"\u003eAlso referenced as \u003cstrong\u003eFL-4350-HSEC-K9\u003c\/strong\u003e or \u003cstrong\u003eL-FL-4350-HSEC-K9=\u003c\/strong\u003e, this \u003cstrong\u003eCisco ISR 4351 HSEC license\u003c\/strong\u003e is a perpetual feature license requiring the \u003cstrong\u003eSEC (securityk9) technology package\u003c\/strong\u003e as a prerequisite. Once activated, HSEC removes IPsec tunnel caps and export-limited crypto thresholds, enabling the 4351 to encrypt at its full rated hardware capacity — critical for high-throughput DMVPN head-ends, GET VPN group members, and enterprise encrypted backbones. Without HSEC, VPN throughput is limited to export-controlled defaults. As a \u003cstrong\u003eCisco ISR 4000 high security feature license\u003c\/strong\u003e, it works with PERF and BOOST for maximum encrypted throughput at carrier-grade speeds. Whether aggregating thousands of branch VPN tunnels or securing a campus-to-data-center encrypted backbone, the \u003cstrong\u003eISR 4351 HSEC license e-delivery\u003c\/strong\u003e unlocks the 4351's full crypto potential.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Section: Key Features --\u003e\n\u003cdiv style=\"margin-bottom: 32px;\"\u003e\n\u003ch2 style=\"font-size: 16px; font-weight: bold; color: #1a1a1a; border-bottom: 2px solid #e8e8e8; padding-bottom: 10px; margin: 0 0 16px 0; letter-spacing: 0.01em;\"\u003e✅ Key Features\u003c\/h2\u003e\n\u003cul style=\"margin: 0; padding: 0; list-style: none;\"\u003e\n\u003cli style=\"font-size: 14px; line-height: 1.7; color: #444; padding: 7px 0 7px 20px; border-bottom: 1px solid #f5f5f5; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #0070d2; font-weight: bold;\"\u003e•\u003c\/span\u003e \u003cstrong\u003eRemoves crypto throughput cap\u003c\/strong\u003e — unlocks full hardware crypto engine performance of the ISR 4351, eliminating all export-restricted limits\u003c\/li\u003e\n\u003cli style=\"font-size: 14px; line-height: 1.7; color: #444; padding: 7px 0 7px 20px; border-bottom: 1px solid #f5f5f5; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #0070d2; font-weight: bold;\"\u003e•\u003c\/span\u003e \u003cstrong\u003eUnlimited IPsec tunnel capacity\u003c\/strong\u003e — removes default tunnel count limits for carrier-scale DMVPN head-end and hub deployments\u003c\/li\u003e\n\u003cli style=\"font-size: 14px; line-height: 1.7; color: #444; padding: 7px 0 7px 20px; border-bottom: 1px solid #f5f5f5; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #0070d2; font-weight: bold;\"\u003e•\u003c\/span\u003e \u003cstrong\u003eRequires SEC (securityk9) license\u003c\/strong\u003e — HSEC augments the Security technology package; SEC must be installed first\u003c\/li\u003e\n\u003cli style=\"font-size: 14px; line-height: 1.7; color: #444; padding: 7px 0 7px 20px; border-bottom: 1px solid #f5f5f5; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #0070d2; font-weight: bold;\"\u003e•\u003c\/span\u003e \u003cstrong\u003eWorks with throughput licenses\u003c\/strong\u003e — combines with PERF (400 Mbps) and BOOST (~600+ Mbps) for maximum encrypted throughput at carrier speeds\u003c\/li\u003e\n\u003cli style=\"font-size: 14px; line-height: 1.7; color: #444; padding: 7px 0 7px 20px; border-bottom: 1px solid #f5f5f5; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #0070d2; font-weight: bold;\"\u003e•\u003c\/span\u003e \u003cstrong\u003eCompatible with all VPN types\u003c\/strong\u003e — IPsec, DMVPN, GET VPN, FlexVPN, and SSL VPN all benefit from HSEC crypto throughput unlock\u003c\/li\u003e\n\u003cli style=\"font-size: 14px; line-height: 1.7; color: #444; padding: 7px 0 7px 20px; border-bottom: 1px solid #f5f5f5; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #0070d2; font-weight: bold;\"\u003e•\u003c\/span\u003e \u003cstrong\u003ePerpetual license\u003c\/strong\u003e — one-time purchase,  no recurring subscription fees\u003c\/li\u003e\n\u003cli style=\"font-size: 14px; line-height: 1.7; color: #444; padding: 7px 0 7px 20px; border-bottom: 1px solid #f5f5f5; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #0070d2; font-weight: bold;\"\u003e•\u003c\/span\u003e \u003cstrong\u003eE-Delivery\u003c\/strong\u003e — license entitlement delivered electronically, fast activation with no shipping delay\u003c\/li\u003e\n\u003cli style=\"font-size: 14px; line-height: 1.7; color: #444; padding: 7px 0 7px 20px; position: relative;\"\u003e\n\u003cspan style=\"position: absolute; left: 0; color: #0070d2; font-weight: bold;\"\u003e•\u003c\/span\u003e Ideal for \u003cstrong\u003ecarrier-grade VPN aggregation, enterprise encrypted backbones, and large-scale DMVPN head-ends\u003c\/strong\u003e on ISR 4351\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c!-- Section: Compatible Platform --\u003e\n\u003cdiv style=\"margin-bottom: 24px;\"\u003e\n\u003ch2 style=\"font-size: 16px; font-weight: bold; color: #1a1a1a; border-bottom: 2px solid #e8e8e8; padding-bottom: 10px; margin: 0 0 16px 0; letter-spacing: 0.01em;\"\u003eCompatible Platform\u003c\/h2\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0;\"\u003eThe \u003cstrong\u003eL-FL-4350-HSEC-K9\u003c\/strong\u003e is exclusively compatible with the \u003cstrong\u003eCisco ISR 4351\u003c\/strong\u003e Integrated Services Router running IOS XE. Requires the \u003cstrong\u003eSEC (securityk9) technology package license\u003c\/strong\u003e as a prerequisite. Requires IOS XE software version 16.x or later with Smart Licensing enabled. \u003cstrong\u003eNot compatible\u003c\/strong\u003e with ISR 4221, ISR 4321, ISR 4331, or ISR 4431\/4451\/4461 — each platform requires its own HSEC SKU. Please verify your router model and current license state before purchase.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Section: Information Needed --\u003e\n\u003cdiv style=\"margin-bottom: 24px;\"\u003e\n\u003ch2 style=\"font-size: 16px; font-weight: bold; color: #1a1a1a; border-bottom: 2px solid #e8e8e8; padding-bottom: 10px; margin: 0 0 16px 0; letter-spacing: 0.01em;\"\u003eInformation Needed\u003c\/h2\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0;\"\u003eTo generate your license file, please send the output of \u003ccode style=\"background: #f5f5f5; padding: 2px 6px; border-radius: 3px; font-size: 13px;\"\u003eshow license udi\u003c\/code\u003e from your Cisco ISR 4351 router to \u003cstrong\u003e\u003ca href=\"mailto:support@switchlicense.com\" style=\"color: #0070d2; text-decoration: none;\"\u003esupport@switchlicense.com\u003c\/a\u003e\u003c\/strong\u003e, or leave a message online after placing your order. The license file is tied to your specific device UDI and cannot be transferred to another unit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Section: License Delivery --\u003e\n\u003cdiv style=\"margin-bottom: 24px;\"\u003e\n\u003ch2 style=\"font-size: 16px; font-weight: bold; color: #1a1a1a; border-bottom: 2px solid #e8e8e8; padding-bottom: 10px; margin: 0 0 16px 0; letter-spacing: 0.01em;\"\u003eLicense Delivery\u003c\/h2\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0;\"\u003eThis \u003cstrong\u003eCisco ISR 4351 High Security feature license\u003c\/strong\u003e is delivered electronically. Once your device UDI is confirmed, we will send you the \u003cstrong\u003elicense entitlement by email\u003c\/strong\u003e. No physical shipment is required .\u003c\/p\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0;\"\u003e\u003cstrong\u003eThis license on sale are available exclusively Traditional License.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Section: Warranty --\u003e\n\u003cdiv style=\"margin-bottom: 24px;\"\u003e\n\u003ch2 style=\"font-size: 16px; font-weight: bold; color: #1a1a1a; border-bottom: 2px solid #e8e8e8; padding-bottom: 10px; margin: 0 0 16px 0; letter-spacing: 0.01em;\"\u003eWarranty\u003c\/h2\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0;\"\u003eWe provide a \u003cstrong\u003e100% working warranty\u003c\/strong\u003e on all licenses. If the license does not activate correctly on your device, we will resolve the issue at no additional cost. All payments are processed securely via \u003cstrong\u003ePayPal\u003c\/strong\u003e for your peace of mind.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c!-- Section: Part Numbers --\u003e\n\u003cdiv style=\"background: #f5f5f5; border-radius: 6px; padding: 14px 18px; font-size: 13px; color: #555; line-height: 1.8;\"\u003e\n\u003cstrong style=\"color: #1a1a1a;\"\u003ePart Numbers:\u003c\/strong\u003e FL-4350-HSEC-K9  |  L-FL-4350-HSEC-K9  |  FL-4350-HSEC-K9=  |  L-FL-4350-HSEC-K9=\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Cisco","offers":[{"title":"Default Title","offer_id":46957568032988,"sku":"FL-4350-HSEC-K9","price":50.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0636\/6402\/9916\/files\/L-FL-4350-HSEC-K9.jpg?v=1776688820","url":"https:\/\/switchlicense.com\/products\/l-fl-4350-hsec-k9","provider":"Switch License","version":"1.0","type":"link"}