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CISCO1921/K9
Cisco ISR 1900 Series, Cisco 1921 Modular Router, 2 GE, 2 EH...
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CISCO1921/K9 delivers a fixed architecture router equipped with integrated LAN/WAN interfaces, optimized power options via an AC power supply, and built‐in security features including IPSec VPN support. Designed with integrated services such as voice, video, and WAN optimization, it meets the connectivity demands of modern branch networks.
Building on its robust design, the Cisco 1921 Integrated Services Router provides modular expansion through dedicated EHWIC and NIM slots, allowing tailored enhancements to interface capabilities. With reliable throughput performance up to 5 Mbps, redundant power supply options, and comprehensive VPN features, CISCO1921/K9 is ideally suited for business and small business use cases where consistent, secure connectivity is critical.
CISCO1921/K9 price is $346.00, a 71% saving from the Cisco list price of $1,195.00. CISCO1921/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for CISCO1921/K9 for additional pricing. Browse the full Router Isr 1900 series or explore all Cisco products.
Scenario: A retail chain needs to interconnect 25 branch locations to its data center over a mixed MPLS and Internet backbone. The Cisco ISR 1921/K9, with its 2 GE ports, 2 EHWIC slots and IP Base feature set, terminates site-to-site IPsec VPN tunnels and integrates seamlessly with existing MPLS circuits. Outcome: End-to-end encryption and dynamic routing reduce WAN complexity by 40 %, deliver sub-5 ms failover for mission-critical POS and inventory traffic, and consolidate security policies centrally for PCI-DSS compliance.
Scenario: A manufacturing plant deploys hundreds of sensors and PLCs on the shop floor. By equipping each cell with a Cisco 1921/K9 router, leveraging its 2 EHWIC slots for dedicated serial and IO modules and 2 GE uplinks, the operations team creates a secure, high-throughput edge network. Outcome: Local data preprocessing and encrypted backhaul to the SCADA system cut cloud ingestion latency by 60 %, simplify device onboarding, and enable predictive maintenance analytics with five-nines availability.
Scenario: A professional services firm requires dynamic path selection for SaaS and IaaS applications across multiple Internet links. Deploying the Cisco 1921/K9 with the IP Base license enables zero-touch provisioning for Cisco SD-WAN, leverages dual GE interfaces for active/backup Internet circuits, and uses 512 MB DRAM for control-plane resiliency. Outcome: Automatic traffic steering improves application SLAs by 30 %, lowers bandwidth costs by 25 %, and accelerates cloud onboarding with centralized orchestration through Cisco vManage.
To get the detailed certification, please go to the Compliance Center.
 CISCO1921/K9 |  C1921-3G-S-SEC/K9 |  CISCO1941-SEC/K9 |  C1921-3G-U-K9 |  C1921-3G-G-SEC/K9 | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Fixed | Fixed | Fixed | Fixed |
| Broadband | N/A | 3G | N/A | 3G | 3G |
| Built-in Security Features | Firewall, Intrusion Prevention | Firewall / Intrusion Prevention | Firewall / Intrusion Prevention / VPN | Firewall, Intrusion Prevention | Firewall / Intrusion Prevention |
| Compliance Standards | IEEE 802.3, IEEE 802.1Q | FCC / CE | FCC / CE / RoHS | FCC, CE | FCC / CE |
| Connectivity Type | Wired | Wired | Wired | Wired | Wired |
| Depth | N/A | N/A | 12.7 inches | N/A | 11.5 inches |
| Device Type | Router | Router | Router | Router | Router |
| EMC | FCC, CE | FCC / CE | FCC Part 15 / CISPR22 | N/A | N/A |
| Ethernet Technology | 10/100 | 10/100 | 10/100 | 10/100 | 10/100 |
| Expansion Slots | EHWIC / NIM | EHWIC | EHWIC | NIM | EHWIC |
| Features | VPN, VoIP, IPv6 Compatible, Firewall | VPN / Firewall / IPSec / 3G Connectivity / Integrated Services | VPN / IPv6 Compatible / Firewall | VPN, IPv6 Compatible, Firewall | VPN / Firewall / IPv6 Compatible / MPLS |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 256 MB | 256 MB | 256 MB | 256 MB |
| Form Factor | Desktop | Desktop | Desktop | Rack-mount | Rack-mount |
| Height | N/A | N/A | 1.8 inches | N/A | 1.75 inches |
| High Availability Support | Supported | Supported | Not Supported | Not Supported | Supported |
| Integrated Services | Voice, Video, WAN Optimization | Voice | Voice / WAN Optimization | Voice, Video | Voice |
| Interface Ports | RJ-45 | RJ-45 | RJ-45 | RJ-45 | RJ-45 |
| LAN Ports | 2 LAN Ports | 4 LAN Ports | 2 LAN Ports | 2 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 512 MB | 256 MB | 512 MB | 512 MB | 256 MB |
| Modular Slots Available | 2 Slots | 2 Slots | 2 Slots | 2 Slots | 2 Slots |
| Network Protocols | IPv4, IPv6 | IPv4 / IPv6 | IPv4 / IPv6 | OSPF, EIGRP, BGP, RIP, Static Routing | IPv4 / IPv6 / MPLS |
| Power | 46 Watt | 85 Watts | 65 W | 43W | 65 W |
| Power Source | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply | AC Power Supply / Redundant Power Supply |
| Product Name | Cisco 1921 Integrated Services Router | Cisco 1921 Integrated Services Router | Cisco 1941 Integrated Services Router Security | Cisco 1921 Integrated Services Router - 3G | Cisco 1921 Integrated Services Router (C1921-3G-G-SEC/K9) |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | SSH, Telnet, SNMP | CLI / SNMP / Web-based | Telnet / SSH / SNMP | Telnet, SSH, SNMP | SSH / Telnet / SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / RIP / Static Routing | EIGRP / OSPF / RIP / BGP / Static Routing |
| Safety | N/A | UL | UL60950 / IEC60950 | N/A | N/A |
| Speed/Capacity | Fast Ethernet | N/A | N/A | 10/100 | N/A |
| Stacking Capability | No | No | No | No | No |
| Telecom | N/A | N/A | TIA/EIA-568 | N/A | N/A |
| Throughput Capacity | 0.075 Gbps | 50 Mbps | 0.075 Gbps | 0.03 Gbps | 0.05 Gbps |
| Use Case | Business / Small Business | Enterprise | Business | Enterprise, Business, Small Business | Enterprise |
| VPN Support | IPSec / DMVPN / N/A | IPSec / DMVPN / FlexVPN | IPSec / SSL VPN | IPSec / SSL VPN / DMVPN | IPSec / DMVPN |
| WAN Configuration | WAN | Dual WAN | Dual WAN | Dual WAN | Dual WAN |
| WAN Ports | 1 WAN | 2 WAN | 2 WAN | 2 WAN | 2 WAN |
| Weight | N/A | N/A | 15.7 lbs | N/A | 12 lbs |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
| Width | N/A | N/A | 17.3 inches | N/A | 17.3 inches |
| Wireless Support | No | No | No | No | No |
Perfect for smaller branch office environments. Performance is consistent, and it integrates seamlessly with our existing systems.
Compact, reliable, and easy to manage. We've used it in multiple locations with no issues at all.
The Cisco 1921 delivers excellent performance. It handles our networking requirements reliably while maintaining a user-friendly interface.
Ideal for small businesses looking for reliable networking equipment. Solid features at an affordable price.
Works as expected for basic routing needs. We've had zero downtime since installation.
The Cisco ISR 1921 is an integrated services router that delivers secure data, voice, and video services for branch offices, featuring 2 Gigabit Ethernet ports, 2 EHWIC slots, 512 MB DRAM, and an IP Base license.
Key features include 2 GE LAN/WAN ports, 2 enhanced HWIC slots for modular expansion, 512 MB of DRAM (upgradeable to 2 GB), 4 GB flash storage, and Cisco IOS IP Base software for routing and basic security.
The Cisco 1921 provides two integrated Gigabit Ethernet RJ-45 ports that support LAN or WAN connectivity and can be configured for either copper or SFP modules.
The Cisco 1921 includes two Enhanced WAN Interface Card (EHWIC) slots for modular voice, security, WAN, or PoE modules, plus one internal service module bay for future growth.
The Cisco 1921 ships with 512 MB of DRAM (expandable to 2 GB) and 4 GB of onboard flash memory to store the IOS image, configuration files, and logs.
With Cisco IOS IP Base, the ISR 1921 delivers up to 50 Mbps of aggregate throughput and up to 25 Mbps of IPsec VPN throughput under standard configurations.
The router includes the Cisco IOS IP Base license by default, with optional upgrades to Security, Unified Communications, or Application Visibility and Control (AVC) feature sets.
Yes, the Cisco 1921 supports IPsec, SSL VPN, Dynamic Multipoint VPN (DMVPN), and FlexVPN, enabling secure site-to-site and remote-access connections.
Integrated security features include Cisco Zone-Based Firewall, Network Address Translation (NAT), Intrusion Prevention System (IPS), Secure Boot, Trust Anchor, and basic malware defenses with optional Cisco ASA services.
The Cisco 1921 uses an internal 60 W AC power supply with an optional DC power supply upgrade; it supports IEC-compliant power cords and offers internal power redundancy when paired with Cisco power modules.
Ideal use cases include small to medium branch offices, retail locations, and enterprise teleworker sites requiring secure routing, VPN connectivity, and modular service expansion.
Basic configuration can be done via Cisco IOS CLI or through the web-based Cisco Configuration Professional, guiding you step-by-step to set up interfaces, routing protocols, and security policies.
The Cisco 1921 includes a limited lifetime hardware warranty, with optional Cisco SMARTnet® support for 24x7 hardware replacement, software updates, and access to the Cisco Technical Assistance Center (TAC).
The Cisco 1921 features ENERGY STAR® design, low-power components, and active power-management features that reduce idle power consumption and optimize thermal performance.
Compared to the 1941, the Cisco 1921 is more cost-effective for smaller sites, with lower base throughput and fewer expansion slots, while the 1941 offers higher performance, additional slots, and advanced service integration.