Cisco router comparison
C1121-4P vs C1121X-8P
C1121-4P has four switched LAN ports; C1121X-8P has eight, with twice the fixed memory and storage. Their two WAN ports are unchanged, while the published encrypted SD-WAN rates and optional PoE capacity differ.
2models compared
48specs published for every model
12confirmed differences
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Key differences
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| Specification | C1121-4P | C1121X-8P |
|---|---|---|
Integrated LAN Switch Ports |
4 x 10/100/1000BASE-T RJ-45 switched LAN ports | 8 x 10/100/1000BASE-T RJ-45 switched LAN ports |
Built-in 1GE Ports |
6 | 10 |
SD-WAN Throughput (512-byte) |
Up to 200 Mbps | Up to 250 Mbps |
IPsec Throughput (512-byte) |
Up to 500 Mbps | Up to 600 Mbps |
Default DRAM |
4 GB | 8 GB |
Storage |
4 GB | 8 GB |
Detailed comparison
Full specification comparison
| Comparison parameter | ||
|---|---|---|
| Product ID | C1121-4P | C1121X-8P |
| Product and ordering | ||
| Product Type | Cisco 1000 Series Integrated Services Router | Cisco 1000 Series Integrated Services Router |
| Form Factor | Desktop fanless router | Desktop fanless router |
| Router Role | Small-branch integrated services router | Small-branch integrated services router |
| Routing and WAN performance | ||
| Configurable Ethernet Ports | 1 x 1GE RJ-45; 1 x 1GE SFP/RJ-45 combo | 1 x 1GE RJ-45; 1 x 1GE SFP/RJ-45 combo |
| Configurable Ethernet Port Count | 2 | 2 |
| Integrated LAN Switch Ports | 4 x 10/100/1000BASE-T RJ-45 switched LAN ports | 8 x 10/100/1000BASE-T RJ-45 switched LAN ports |
| Integrated LAN Port Count | 4 | 8 |
| Built-in 1GE Ports | 6 | 10 |
| Built-in 10GE Ports | 0 | 0 |
| Expansion Slots | No modular slots | No modular slots |
| NIM Slots | 0 | 0 |
| SM-X Slots | 0 | 0 |
| Service Module Support | Not applicable | Not applicable |
| Ports and interfaces | ||
| Management Ports | Management through routed Ethernet; no dedicated management Ethernet port | Management through routed Ethernet; no dedicated management Ethernet port |
| Console Ports | 1 x micro-USB console | 1 x micro-USB console |
| Performance and scale | ||
| Forwarding Throughput (512-byte) | Up to 1,600 MbpsAutonomous mode | Up to 1,600 MbpsAutonomous mode |
| SD-WAN IPsec Throughput (512-byte) | Up to 450 Mbps | Up to 700 Mbps |
| SD-WAN Throughput (512-byte) | Up to 200 Mbps512-byte packets; IPsec, QoS, deep packet inspection and Flexible NetFlow enabled | Up to 250 Mbps512-byte packets; IPsec, QoS, deep packet inspection and Flexible NetFlow enabled |
| IPsec Throughput (512-byte) | Up to 500 MbpsAutonomous mode | Up to 600 MbpsAutonomous mode |
| SD-WAN Overlay Tunnels | 200 | 200 |
| IPsec Tunnels | 100IPsec SVTI tunnels, autonomous mode | 100IPsec SVTI tunnels, autonomous mode |
| NAT Sessions | 100,000 | 100,000 |
| IPv4 Routes | 280,000 | 280,000 |
| IPv6 Routes | 260,000 | 260,000 |
| IPv4 ACLs | 4,000 | 4,000 |
| IPv4 ACEs | 10,000 | 10,000 |
| VRF Instances | 1,000 | 1,000 |
| Configuration, licensing and management | ||
| Routing Protocols | Static routing, BGP, OSPF, EIGRP, IS-IS, RIP and VRF-Lite | Static routing, BGP, OSPF, EIGRP, IS-IS, RIP and VRF-Lite |
| Management Model | Cisco Catalyst SD-WAN Manager, Cisco Catalyst Center, WebUI, CLI and SNMP | Cisco Catalyst SD-WAN Manager, Cisco Catalyst Center, WebUI, CLI and SNMP |
| Licensing | Cisco Smart Licensing with Network and security feature tiers | Cisco Smart Licensing with Network and security feature tiers |
| Required Subscription | Cisco DNA subscription required for SD-WAN; autonomous routing can be licensed separately | Cisco DNA subscription required for SD-WAN; autonomous routing can be licensed separately |
| USB Ports | 1 x USB 3.0 Type-A host port | 1 x USB 3.0 Type-A host port |
| Memory and software | ||
| Default DRAM | 4 GB | 8 GB |
| Maximum DRAM | 4 GB | 8 GB |
| Storage | 4 GB | 8 GB |
| Operating System | Cisco IOS XE autonomous or SD-WAN software | Cisco IOS XE autonomous or SD-WAN software |
| Minimum Software Release | Cisco IOS XE 16.11.1 or later; Cisco IOS XE SD-WAN 17.2.1 or later | Cisco IOS XE 16.11.1 or later; Cisco IOS XE SD-WAN 17.2.1 or later |
| PoE and power | ||
| Integrated PoE Support | Optional PoE/PoE+ on LAN ports with the 115 W adapter: 2 PoE or 1 PoE+ port | Optional PoE/PoE+ on LAN ports with the 150 W adapter: 4 PoE or 2 PoE+ ports |
| Default PoE Budget | 0 W | 0 W |
| Default Power Supply | 66 W external AC adapter; 115 W adapter for PoE | 66 W external AC adapter; 150 W adapter for PoE |
| Power Redundancy | No power-supply redundancy | No power-supply redundancy |
| Physical and environmental | ||
| Dimensions (H × W × D) | 41.9 × 274.3 × 199.4 mm | 41.9 × 274.3 × 199.4 mm |
| Weight | 1.55 kg | 1.58 kg |
| Operating Temperature | 0 to 40 °C | 0 to 40 °C |
| Storage Temperature | -40 to 70 °C | -40 to 70 °C |
| Storage Humidity | 5% to 95% | 5% to 95% |
| Operating Humidity | 10% to 85% | 10% to 85% |
| Operating Altitude | 0–3,048 m | 0–3,048 m |
| MTBF | 680,590 hours | Not published by Cisco |
| Warranty | Cisco 1-year limited hardware warranty | Cisco 1-year limited hardware warranty |
Specifications from Cisco 1000 Series Integrated Services Routers Data Sheet (checked 2026-10-11).
“Not published by Cisco” and “Not listed” indicate that a confirmed direct comparison is unavailable. These rows are not counted as confirmed differences.
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