{"product_id":"l-fl-4350-perf-k9","title":"Cisco L-FL-4350-PERF-K9 | Performance License (200M to 400M) 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-PERF-K9 | ISR 4351 Performance Throughput 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-PERF-K9\u003c\/strong\u003e is a \u003cstrong\u003eCisco ISR 4351 Performance (PERF) Throughput License\u003c\/strong\u003e — the essential upgrade that doubles the aggregate throughput of the Cisco ISR 4351 Integrated Services Router from 200 Mbps to 400 Mbps. This \u003cstrong\u003eCisco ISR 4351 performance license\u003c\/strong\u003e unlocks the next throughput tier on the highest-performance ISR 4000 platform, making it the critical upgrade for enterprise campus, data center edge, and carrier-grade deployments that need maximum WAN bandwidth for concurrent routing, security, voice, and SD-WAN services.\u003c\/p\u003e\n\u003cp style=\"font-size: 14px; line-height: 1.75; color: #444; margin: 0;\"\u003eAlso referenced as \u003cstrong\u003eFL-4350-PERF-K9\u003c\/strong\u003e or \u003cstrong\u003eL-FL-4350-PERF-K9=\u003c\/strong\u003e, this \u003cstrong\u003eCisco ISR 4351 throughput upgrade license\u003c\/strong\u003e is a perpetual feature license that removes the base 200 Mbps aggregate throughput limit and raises it to 400 Mbps. The PERF license is a \u003cstrong\u003eprerequisite for the BOOST license\u003c\/strong\u003e (FL-4350-BOOST-K9), which further increases throughput to the platform maximum (~600+ Mbps). Unlike technology packages, the PERF license does not add features — it purely increases throughput across all services. As a \u003cstrong\u003eCisco ISR 4000 performance license\u003c\/strong\u003e, it is applied via Smart Licensing on IOS XE. Whether upgrading from a 200 Mbps WAN link or preparing for SD-WAN at carrier scale, the \u003cstrong\u003eISR 4351 PERF license e-delivery\u003c\/strong\u003e doubles your router's capacity instantly.\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\u003eDoubles aggregate throughput\u003c\/strong\u003e — raises the ISR 4351 platform limit from 200 Mbps to 400 Mbps aggregate (combined ingress + egress)\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\u003eSoftware-based throughput unlock\u003c\/strong\u003e — no hardware module or physical upgrade; activated entirely through Smart Licensing on IOS XE\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\u003ePrerequisite for BOOST license\u003c\/strong\u003e — the FL-4350-BOOST-K9 requires PERF first; BOOST raises throughput to the maximum (~600+ Mbps)\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\u003eApplies to all services\u003c\/strong\u003e — increased throughput covers routing, firewall, VPN encryption, voice DSP, WAAS, and SD-WAN concurrently\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\u003eNo feature changes\u003c\/strong\u003e — purely a throughput upgrade; technology features remain governed by APP\/SEC\/UC licenses\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\u003eenterprise campus WAN, data center edge, and carrier-grade multi-service deployments\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-PERF-K9\u003c\/strong\u003e is exclusively compatible with the \u003cstrong\u003eCisco ISR 4351\u003c\/strong\u003e Integrated Services Router running IOS XE. Requires IOS XE software version 16.x or later with Smart Licensing enabled. \u003cstrong\u003eThroughput tiers:\u003c\/strong\u003e Base = 200 Mbps → PERF = 400 Mbps → PERF + BOOST = ~600+ Mbps. \u003cstrong\u003eNot compatible\u003c\/strong\u003e with ISR 4221, ISR 4321, ISR 4331, or ISR 4431\/4451\/4461 — each platform uses its own performance license SKU. Please verify your router model 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 Performance throughput 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-PERF-K9  |  L-FL-4350-PERF-K9  |  FL-4350-PERF-K9=  |  L-FL-4350-PERF-K9=\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Cisco","offers":[{"title":"Default Title","offer_id":46957548110044,"sku":"L-FL-4350-PERF-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-PERF-K9.jpg?v=1776688799","url":"https:\/\/switchlicense.com\/products\/l-fl-4350-perf-k9","provider":"Switch License","version":"1.0","type":"link"}