C1121-4P Integrated Services Router with 4 Gb ports and 2 Gb WAN

Cisco C1121-4P – ISR 1100 Series 4‑Port Gigabit Ethernet Router

The Cisco C1121‑4P is a next‑generation branch router designed for secure, high‑performance WAN connectivity with integrated switching and advanced SD‑WAN capabilities. Part of the ISR 1100 Series, it delivers 4x Gigabit Ethernet LAN ports, multi‑layer security, and application‑optimized performance for modern distributed networks. With support for Cisco SD‑WAN, encrypted tunnels, and cloud‑managed provisioning, the C1121‑4P is ideal for small branches, retail sites, and remote offices requiring reliable, scalable connectivity.

🔧 Key Specifications

• WAN Interfaces: 1x RJ45 and RJ45/SFP combo Gigabit Ethernet WAN port
• LAN Interfaces: 4x 10/100/1000 Gigabit Ethernet LAN ports with PoE/PoE+ support
• SD-WAN IPsec Throughput: Up to 1426 Mbps
• Routing Performance: Optimized for secure WAN, SD-WAN, and advanced services
• Integrated Security: Cisco IOS XE with Zone-Based Firewall, VPN, and advanced threat defense
• Management: Cisco DNA Center, CLI, web-based UI, and zero-touch provisioning
• Form Factor: Compact desktop or rack-mountable (1RU with bracket)
• Power: Internal AC power supply with PoE budget (up to 120W depending on model)
• Dimensions (W x D x H): 1.65 x 10.80 x 7.85 in
• Weight: 3.43 lb
• Operating System: Cisco IOS XE

🧩 Ideal Use Cases

• Branch office WAN edge with integrated PoE for IP phones and APs
• Secure VPN gateway for remote offices
• Small business deployments needing routing, switching, and PoE in one device
• Environments adopting Cisco SD-WAN for simplified WAN management
  

⚙️ Licensing & Expansion

• Runs Cisco IOS XE with perpetual or subscription licensing for advanced features (e.g., SD-WAN, security, application visibility).
• Supports Cisco DNA Center for centralized management and automation.
• PoE budget allows powering of multiple endpoints without external injectors or switches.