Cisco C1121-4P ISR 1100 4-Port Dual GE SFP Integrated Services Router - New

The Cisco C1121-4P is a compact ISR 1100 Series Integrated Services Router built for small offices, retail sites, and branch deployments that need enterprise-class routing in a small footprint. It features dual GE WAN ports (1x GE and 1x GE/SFP combo) for flexible or redundant uplinks, plus 4x Gigabit Ethernet LAN ports, all managed through Cisco IOS XE software. The router supports both traditional autonomous mode and Cisco SD-WAN (vManage) controller mode, giving IT teams a simple upgrade path to intent-based networking. Its fanless, silent design makes it ideal for noise-sensitive environments like clinics, retail counters, and home offices.

Cisco C1121-4P - Key Features & Benefits

• Dual GE WAN for Flexible Connectivity: 1x Gigabit Ethernet port + 1x GE/SFP combo port support fiber or copper uplinks with primary/backup WAN flexibility
• 4x Gigabit LAN Ports with Optional PoE+: Connect switches, IP phones, or access points directly; optional PoE/PoE+ module (2 PoE or 1 PoE+ port) available for single-cable device power
• Cisco IOS XE - Autonomous or SD-WAN Mode: Runs the same Cisco IOS XE software used across the Catalyst 8000 and ASR platforms, supporting both classic CLI management and Cisco SD-WAN (vManage) centralized control
• Compact, Fanless, Silent Operation: Passive cooling design keeps power consumption at 18.8W maximum with zero fan noise, ideal for small offices and open workspaces
• Enterprise Security Ready: Ships with the IP Base license by default; optional Security (SEC) license unlocks zone-based firewall, IPsec VPN, DMVPN, and FlexVPN

Cisco C1121-4P - Technical Specifications

• Part Number: C1121-4P • ISR 1100 4P Dual GE SFP Router
• WAN Ports: 2x Gigabit Ethernet • 1x GE (copper) + 1x GE/SFP combo
• LAN Ports: 4x Gigabit Ethernet (copper)
• PoE Support: Optional PoE/PoE+ module (2 PoE or 1 PoE+ port) via ISR-1100-POE2 & 115W PSU
• Memory: 4GB DRAM • 4GB Flash
• Console & USB: Micro-USB console port • USB 3.0 Type-A storage port
• Software: Cisco IOS XE — Autonomous Mode or Cisco SD-WAN Controller Mode
• Max IPsec Throughput: Up to 370 Mbps (multi-tunnel, IMIX, Autonomous Mode)
• Default License: IP Base • optional APP, UC, and SEC licenses available
• Dimensions: 1.65 x 10.80 x 7.85 in.
• Weight: 3.43 lb (1.55 kg)
• Power: External 12VDC power supply, 66W max output • 18.8W max device consumption
• Operating Temperature: 32°F to 104°F (0° to 40°C)
• Condition: New

Cisco C1121-4P - Frequently Asked Questions (FAQ)

• Does the C1121-4P support Cisco SD-WAN?
  Yes — it runs the same Cisco IOS XE image and can operate in either traditional autonomous mode or Cisco SD-WAN (vManage) controller mode. It ships with the IP Base license; advanced features like firewall and VPN require an optional SEC license.
• What's the difference between the C1121-4P and C1121-4PLTEP?
  The C1121-4P (this listing) has no cellular hardware installed. The C1121-4PLTEP is a separate SKU that ships with an integrated pluggable LTE/5G cellular module factory-installed, giving it built-in cellular WAN for backup or primary connectivity. Port counts and base specs are otherwise the same.
• Does this router include PoE for powering phones or access points?
  Not out of the box. PoE/PoE+ requires the optional ISR-1100-POE2 module and a 115W power supply, which together provide 2 PoE or 1 PoE+ port on the 4-port LAN side.

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