Cisco 1121 4-Port 10/100/1000BASE-T Ethernet Desktop Integrated Services Router – C1121-4P

Cisco 1121 4-Port Gigabit Desktop Integrated Services Router

The Cisco C1121-4P is a compact desktop Integrated Services Router (ISR) offering four 10/100/1000BASE-T Ethernet ports, built-in security, and Cisco IOS XE software — designed for small branch offices and remote sites requiring enterprise-grade WAN connectivity and security in a small form factor.

Key Features

• 4 x 10/100/1000BASE-T LAN/WAN Ethernet ports for flexible branch connectivity
• Cisco IOS XE software for advanced routing, security, and SD-WAN capability
• Integrated firewall, VPN, and NAT for comprehensive branch security
• Desktop form factor for small offices and remote site deployments
• Cisco DNA Center compatible for centralized intent-based network management

Product Specifications

• Part Number: C1121-4P
• Manufacturer: Cisco
• Ports: 4 x 10/100/1000BASE-T Ethernet
• WAN Ports: 2 (configurable)
• Form Factor: Desktop
• Software: Cisco IOS XE
• USB: 1 x USB 3.0 (management/storage)

Interface Specifications

• LAN Ports: 2 x GbE (switchable)
• WAN Ports: 2 x GbE
• Console: RJ-45 + USB mini-B
• Management: Cisco DNA Center, CLI, Web UI
• Routing Protocols: OSPF, EIGRP, BGP, RIP, static
• VPN: IPSec, DMVPN, FlexVPN, SSL VPN

Use Cases

• Small branch office WAN gateway with integrated security
• Remote site router for SD-WAN deployments managed via Cisco DNA Center
• Secure VPN termination point for branch-to-HQ connectivity
• SMB edge router with firewall and NAT for internet access control

Compatibility

• Compatible with Cisco SD-WAN (Viptela) for software-defined branch deployments
• Supported by Cisco DNA Center for intent-based network management
• Works with Cisco Umbrella for cloud-delivered DNS security
• Compatible with standard IOS XE feature licensing via Cisco Smart Licensing

Frequently Asked Questions

Does the C1121-4P support SD-WAN?

Yes — the C1121-4P supports Cisco IOS XE SD-WAN (Viptela) software, enabling it to be managed as part of a Cisco SD-WAN fabric via vManage.

What is the difference between C1121-4P and C1121-8P?

The C1121-8P adds four additional LAN switch ports (8 total vs 4), providing more local connectivity for small branch environments with more endpoints.

Does the C1121-4P include a security license?

Cisco ISR 1000 series security features are available via Cisco DNA Advantage or Essentials licensing. Verify the included license tier with your Cisco partner at time of purchase.

The Cisco C1121-4P brings enterprise ISR capabilities to the smallest branch deployments — combining multi-WAN flexibility, integrated security, and full IOS XE programmability in a desktop footprint that scales from simple NAT routing to full SD-WAN orchestration.