Cisco 4221 ISR Router Rack-Mountable Modular 1U

Overview

The Cisco ISR4221/K9 is a modular branch router designed to combine routing, security, and voice services within a compact 1U rack-mountable chassis. It delivers up to 35 Mbps aggregate throughput and supports Ethernet, Fast Ethernet, and Gigabit Ethernet interfaces, making it well suited for small to midsize offices requiring reliable connectivity. This router integrates essential network functions into a single device, simplifying infrastructure while supporting modern protocols like OSPF, BGP, and IPv6 for flexible network deployment.

Key features

• Modular design with two open Network Interface Module (NIM) slots allows easy expansion for additional LAN/WAN ports or advanced security services without replacing the base unit.
• Supports a range of routing protocols including OSPF, BGP, and IPv6 to fit seamlessly into diverse network topologies and enable secure site-to-site VPNs.
• Integrated VPN and VLAN capabilities provide secure and segmented traffic management, ideal for separating guest, voice, and data networks.
• Runs Cisco IOS IP Base software, offering a stable and feature-rich platform for network operations and future updates.
• External power adapter compatible with both 120 V and 230 V AC inputs simplifies installation across different global power standards.
• High reliability with a mean time between failures (MTBF) of approximately 593,270 hours ensures long-term stable operation in critical environments.

Key specs

• Aggregate throughput: up to 35 Mbps
• Memory: 4 GB RAM
• Storage: 8 GB flash memory
• Form factor: 1U rack-mountable chassis
• Network interfaces: Ethernet, Fast Ethernet, Gigabit Ethernet
• Expansion slots: 2 open Network Interface Module (NIM) slots
• Routing protocols supported: OSPF, BGP, IPv6
• Power input: external adapter supporting 120 V or 230 V AC
• Mean time between failures (MTBF): approximately 593,270 hours

Connectivity and compatibility

This router supports a variety of Ethernet standards, including Fast Ethernet and Gigabit Ethernet, allowing it to connect efficiently to existing network infrastructure. The two NIM slots provide flexibility to add specialized interfaces or additional ports as network demands grow. Compatibility with common routing protocols ensures it integrates smoothly with corporate backbones and supports secure VPN connections for remote branches or teleworkers.

Ideal uses and environments

The Cisco ISR4221/K9 fits well in small to midsize business environments that require dependable network connectivity with integrated security and voice capabilities. It is a strong choice for remote branch offices, teleworker access points, and retail locations where continuous uptime is critical. Its modular design and robust software platform make it adaptable to evolving network needs without requiring frequent hardware replacements.