Cisco Integrated Services Router ISR4331/K9 – High‑Performance Branch Router

Description

The Cisco ISR4331/K9 is a modular integrated services router from Cisco’s 4000 Series, designed to deliver robust and scalable networking for mid‑sized branch offices and enterprise edge deployments. Engineered with flexibility in mind, this rack‑mountable 1 RU platform combines routing, security, WAN optimization, and unified communications support in a single device. It offers an aggregate throughput range from 100 Mbps up to 300 Mbps (with performance licenses), making it suitable for demanding WAN environments and hybrid connectivity strategies.

The ISR4331/K9 includes a modular interface architecture with 2 NIM slots and 1 Enhanced Service Module (SM‑X) slot, enabling expansion with additional WAN, LAN, and service interfaces as network requirements grow. Its onboard connectivity includes multiple Gigabit Ethernet and SFP ports for flexible LAN and WAN integration. Running on Cisco’s IOS XE operating system, the router supports advanced features such as SD‑WAN, VPN, firewall, and segmentation to ensure secure and optimized application delivery across distributed networks.

With internal AC power options and compact rack‑mount design, the ISR4331/K9 is ideal for branch offices, regional hubs, and enterprise sites that need consolidated networking and security functions in a single, manageable platform.

Key Features:

• Integrated Services platform with modular interface expansion (2 × NIM, 1 × SM‑X)

• Aggregate throughput from 100 Mbps up to 300 Mbps with performance licensing

• Multiple onboard Gigabit Ethernet and SFP ports for flexible WAN/LAN connectivity

• Runs Cisco IOS XE for advanced routing, security, and SD‑WAN capabilities

• Compact 1 RU rack‑mount chassis for efficient deployment in branch racks

• Supports VPN, firewall, and integrated services for converged branch networks