Cisco 921 Series Gigabit Ethernet Security Router
Product Description
The Cisco C921‑4P is a compact enterprise‑class Gigabit Ethernet security router from the Cisco 900 Series Integrated Services Routers (ISR) family. Designed for small to medium‑sized businesses, branch offices, and service provider customer premises equipment (CPE) deployments, it combines routing, switching, and security features in a single device. The router provides flexible connectivity with multiple Ethernet interfaces, integrated security and routing services, and support for Cisco IOS XE software for scalable network management.
Model Type
Integrated Services Router (Fixed Configuration Gigabit Router)
Category
Networking — Enterprise Security Router / Branch Router
Key Features
2× Gigabit Ethernet WAN Interfaces — Dual Gigabit ports for reliable broadband or Metro Ethernet WAN connectivity.
4× Gigabit Ethernet LAN Ports — Built‑in managed switch for connecting multiple local devices.
Integrated Security & Routing — Runs Cisco IOS XE with support for routing protocols (OSPF, BGP, RIPv1/2), NAT, ACLs, DHCP services, and secure tunnelling (GRE, L2TP, VRF‑Lite).
Maximum Crypto Throughput ~150 Mbps — Policed throughput for secure VPN and encrypted traffic.
Managed LAN Features — VLAN support, QoS, ACLs, IGMP snooping, SPAN, and MAC filtering for robust traffic control.
USB 2.0 Port — Integrated USB port for external storage or device connectivity.
Compact & Power‑Efficient — Internal AC power supply, desktop form factor ideal for constrained spaces.
Multiple Management Options — CLI, SNMP, web‑based GUI, and remote tools for configuration and monitoring.
Technical Specs at a Glance
| Specification | Details |
|---|---|
| Model | Cisco C921‑4P |
| Series | Cisco 900 ISR |
| WAN Ports | 2 × Gigabit Ethernet |
| LAN Ports | 4 × Gigabit Ethernet (managed switch) |
| USB Ports | 1 × USB 2.0 |
| Routing Throughput | Up to ~150 Mbps crypto policed |
| Software | Cisco IOS XE |
| Routing Protocol Support | OSPF, BGP, RIPv1/2, VRF‑Lite, GRE, MGRE |
| Switching Features | VLAN, QoS, ACL, IGMP Snooping, SPAN |
| Management Interfaces | CLI, Web UI, SNMP |
| Form Factor | Desktop / Compact |
| Power | Internal AC Power Supply |
| PoE Support | No |
| Deployment | Branch offices / SMB sites / service provider CPE |
Typical Use Cases
Branch Office Connectivity — Provides secure WAN and LAN routing with integrated switching and security protection.
Small Business Internet Edge — Acts as a secure gateway for internet, VPN, and site‑to‑site connectivity.
Managed Services CPE — Ideal for service providers deploying Ethernet WAN services with SLA monitoring at customer sites.
Remote Offices and Retail Locations — Compact solution for secure, manageable network access where space and IT resources are limited.
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