Cisco L-FL-4220-PERF-K9 | Performance License (35M to 75M) for ISR 4221 E-Delivery

About This Product

Buy Cisco L-FL-4220-PERF-K9 | ISR 4221 Performance Throughput License | E-Delivery

The L-FL-4220-PERF-K9 is a Cisco ISR 4221 Performance (PERF) Throughput License — the essential upgrade that doubles the aggregate throughput of the Cisco ISR 4221 Integrated Services Router from 35 Mbps to 75 Mbps. This Cisco ISR 4221 performance license unlocks the next throughput tier on the entry-level ISR 4000 platform, making it the ideal upgrade for growing branch deployments that need more WAN bandwidth headroom without replacing the router hardware.

Also referenced as FL-4220-PERF-K9 or L-FL-4220-PERF-K9=, this Cisco ISR 4221 throughput upgrade license is a perpetual feature license that removes the base 35 Mbps aggregate throughput limit and raises it to 75 Mbps. The PERF license is a prerequisite for the BOOST license (FL-4220-BOOST-K9), which further increases throughput. Unlike technology packages (APP/SEC), the PERF license does not add features — it purely increases the platform throughput ceiling. As a Cisco ISR 4000 performance license, it is applied via Smart Licensing on IOS XE. Whether you are upgrading bandwidth at a small branch or preparing for future growth, the ISR 4221 PERF license e-delivery doubles your router's capacity instantly — no hardware upgrade needed.

✅ Key Features

• • Doubles aggregate throughput — raises the ISR 4221 platform limit from 35 Mbps to 75 Mbps aggregate (combined ingress + egress)
• • Software-based throughput unlock — no hardware module or physical upgrade required; activated entirely through Smart Licensing
• • Prerequisite for BOOST license — the FL-4220-BOOST-K9 license requires PERF to be installed first; BOOST further raises throughput beyond 75 Mbps
• • Applies to all traffic — increased throughput covers routing, firewall, VPN, and application services running on the platform
• • No feature changes — purely a throughput upgrade; technology features remain governed by APP/SEC/UC licenses
• • Perpetual license — one-time purchase, no recurring subscription fees
• • E-Delivery — license entitlement delivered electronically, fast activation with no shipping delay
• • Ideal for growing branch deployments, bandwidth upgrades, and preparing for BOOST on the ISR 4221 platform

Compatible Platform

The L-FL-4220-PERF-K9 is exclusively compatible with the Cisco ISR 4221 Integrated Services Router running IOS XE. Requires IOS XE software version 16.x or later with Smart Licensing enabled. Throughput tiers: Base = 35 Mbps → PERF = 75 Mbps → PERF + BOOST = maximum platform throughput. Not compatible with ISR 4321 or other ISR 4000 Series models — each platform uses its own performance license SKU (e.g., FL-4320-PERF-K9 for ISR 4321). Please verify your router model before purchase.

Information Needed

To generate your license file, please send the output of show license udi from your Cisco ISR 4221 router to support@switchlicense.com, 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.

License Delivery

This Cisco ISR 4221 Performance throughput license is delivered electronically. Once your device UDI is confirmed, we will send you the license entitlement by email. No physical shipment is required 

This license on sale are available exclusively Traditional License.

Warranty

We provide a 100% working warranty 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 PayPal for your peace of mind.