Cisco 921 Gigabit Ethernet Security Router C921-4P

The Cisco 921 Gigabit Ethernet Security Router C921-4P delivers high-performance connectivity with integrated enterprise-grade security, making it ideal for small businesses, branch offices, and managed service deployments. With dual Gigabit WAN ports, a 4-port managed LAN switch, and advanced VPN and firewall capabilities, it offers secure broadband or Metro Ethernet connectivity in a compact and cost-efficient package. Designed for easy deployment and remote management, this router enables service providers to deliver high-quality Ethernet WAN services with extensive routing, threat protection, and application visibility.

Product Features

Integrated Gigabit WAN and LAN Ports

Equipped with two Gigabit Ethernet WAN ports and a four-port managed Gigabit LAN switch, the C921-4P allows flexible deployment for primary and backup WAN links while supporting multiple local devices with reliable LAN performance.

Enterprise-Level Security

Provides advanced security features including IPsec VPN, SSL VPN, DMVPN, zone-based firewall, access control lists, intrusion prevention system (IPS), NAT, and MAC/IP binding. Protects against both known and emerging network threats.

High VPN Throughput

Supports up to 150 Mbps of crypto throughput, making it suitable for secure site-to-site or remote access VPN connections without performance degradation.

Full Routing Protocol Support

Supports comprehensive IPv4 and IPv6 routing protocols including OSPF, EIGRP, BGP, RIP, GRE, and VRF-Lite. Ideal for dynamic, scalable, and highly available enterprise and service provider networks.

Application Visibility and Control

Features NBAR2 and Flexible NetFlow for real-time traffic classification and network usage monitoring, allowing intelligent bandwidth allocation and QoS.

Centralized Management and Remote Access

Manages via CLI, SSH, HTTP(S), SNMPv3, and Cisco Configuration Professional. Supports RADIUS, TACACS+, and auto-install features to simplify provisioning and reduce deployment time.

Compact and Power-Efficient Design

With a small form factor and internal power supply, the router operates efficiently in limited-space environments without compromising performance or reliability.

Product Specifications

• Model: Cisco C921-4P
• WAN interfaces: 2 Gigabit Ethernet ports
• LAN interfaces: 4-port Gigabit Ethernet managed switch
• USB: 1 USB 2.0 Type A port
• Console port: RJ-45
• VPN capability: Supports 50 IPsec VPN tunnels
• Maximum crypto throughput: 150 Mbps
• Routing protocols: OSPF, BGP, EIGRP, RIP, VRF-Lite, GRE, L2TP, L2TPv3
• Security features: IPsec, SSL VPN, DMVPN, zone-based firewall, NAT, IPS, ACLs
• Management options: CLI, SSH, HTTP/HTTPS, SNMPv3, Cisco Configuration Professional
• QoS capabilities: LLQ, CBWFQ, NBAR2, Hierarchical QoS, RTP header compression
• IPv6 support: Full IPv6 dual-stack, SLAAC, DHCPv6, NAT64, OSPFv3, BGP4+
• Application monitoring: Flexible NetFlow, Performance Agent
• Dimensions: 1.70 x 9.0 x 9.5 inches (4.32 x 22.86 x 24.13 cm)
• Power input: 100 to 240 VAC, 50 to 60 Hz (internal power supply)
• Operating temperature: 0°C to 50°C
• Storage temperature: -40°C to 70°C
• Operating humidity: 5% to 95% non-condensing
• Certifications: IEC 60950-1, UL 60950-1, CE, FCC, RoHS, EN 55032, EN 61000-3-2