Powered by Cisco IOS XE and a multicore architecture, the series delivers deterministic performance—even when running intensive services like SD-WAN, firewall, and application control. Features like pay-as-you-grow performance licensing and modular expandability with Network Interface Module (NIM) and service module slots make scaling seamless.

Security is built in. With integrated NGFW, IPsec VPN, and seamless integration into Cisco Catalyst SD-WAN ecosystems, the ISR 4000 routers protect and optimize connectivity across distributed sites. They also support enhanced visibility, zero-touch provisioning, and application intelligence via SD-WAN frameworks—all aimed at reducing OpEx and accelerating branch turnaround.

At NetworkTigers, both refurbished and used Cisco ISR 4000 Series routers are available. Refurbished units undergo rigorous testing and verification to ensure they meet performance standards. Used units are confirmed ready for production networks, delivering dependable service right away. Inventory is kept in stock for fast fulfillment, orders ship quickly, and every purchase includes a 365-day warranty, offering long-term value and confidence.