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Arthur Curry
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The Cisco 921 is the perfect branch office router. It's compact, secure, and incredibly reliable. High-performance Gigabit routing in a very small footprint.
C921-4P
900 SERIES INTEG SVCS ROUTERS
FEATURED DEAL
Name:
C921-4P
- Description:
- 900 SERIES INTEG SVCS ROUTERS
- Rating:
Added to cart 28 times recently
- Availability:
In stock - Ready to Ship
- Brand:
- Cisco
- GTIN:
- 889728172110
- Condition:
- Warranty:
- 3
- List Price:
$997.00
- Price:
$612.0038.6% off
Quantity:
1
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C921-4P Overview
C921-4P is a high-performance integrated services router, designed with a fixed architecture that delivers reliable throughput and robust security tailored for enterprise branch deployments. Its power options include an AC power supply, while the device offers a single WAN interface and four dedicated LAN ports with Gigabit Ethernet speeds, ensuring efficient network connectivity and high redundancy for business-critical applications.
C921-4P supports advanced VPN features including IPSec and SSL VPNs, and comes equipped with integrated voice and video services that streamline converged communications. Built as a fully managed, rack-mount solution with proven firewall capabilities and quality of service (QoS) features, this router excels in supporting enterprise use cases that demand modular performance, comprehensive remote management (via SSH, Telnet, and SNMP), and high availability.
C921-4P price is $612.00, a 38.6% saving from the Cisco list price of $997.00. C921-4P is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for C921-4P for additional pricing. Browse the full Cisco Router Isr 900 series or explore all Cisco products.
C921-4P Specifications
- Product Type
- Integrated Services Router
- VPN Support
- IPSec, SSL VPN
- Power Source
- AC Power Supply
- Routing Protocols
- OSPF, EIGRP, RIP, BGP, Static Routing
- Broadband
- LTE
- Architecture
- Fixed
- WAN Configuration
- WAN
- WAN Ports
- 1 WAN
- LAN Ports
- 4 LAN Ports
- Ethernet Technology
- 10/100/1000
- Wi-Fi Standard
- N/A
- Connectivity Type
- Wired
- Network Protocols
- IPv4, IPv6
- Remote Management
- SSH, Telnet, SNMP
- Compliance Standards
- IEEE 802.1x
- Wireless Support
- No
- Speed/Capacity
- Gigabit
- Firewall Features
- Yes
- Features
- VPN, Firewall, QoS, PoE
- Use Case
- Enterprise
- Management
- Managed
- Form Factor
- Rack-mount
- Integrated Services
- Voice, Video
- High Availability Support
- Supported
- Safety
- UL, CE
- EMC
- FCC, CE
- Telecom
- TIA/EIA
- Throughput Capacity
- 250 Mbps
- QoS Features
- Supported
- Built-in Security Features
- Firewall, Intrusion Prevention, Malware Protection
- Expansion Slots
- N/A
- Modular Slots Available
- N/A
- Stacking Capability
- No
- 5G Support
- No
- Memory
- 512 MB
- Flash Memory
- 256 MB
- Interface Ports
- RJ-45, SFP
- Power
- 45 Watt
- Device Type
- Router
- Product Name
- Cisco C921-4P Integrated Services Router
- Height
- 1.75 inches
- Width
- 17.5 inches
- Depth
- 16.5 inches
- Weight
- 8 lbs
Quality Certifications
To get the detailed certification, please go to the Compliance Center.
Product Comparison Table 
 C921-4P |  C931J-4P |  C926-4P |  C921-4PLTEAS |  C941J-4P | |
|---|---|---|---|---|---|
| 5G Support | No | No | No | No | No |
| Architecture | Fixed | Modular | Modular | Modular | Modular |
| Broadband | LTE | N/A | N/A | LTE | Fiber Optic / DSL |
| Built-in Security Features | Firewall, Intrusion Prevention, Malware Protection | Firewall, Intrusion Prevention, Malware Protection | Firewall, Intrusion Prevention, Malware Protection | Firewall, Intrusion Prevention, Malware Protection | Firewall, Intrusion Prevention |
| Compliance Standards | IEEE 802.1x | FCC, CE | FCC, CE, RoHS | FCC, CE, RoHS | FCC, CE, RoHS |
| Connectivity Type | Wired | Wired | Wired | Wired | Wired |
| Depth | 16.5 inches | 17 inches | 18 inches | N/A | 15 inches |
| Device Type | Router | Router | Router | Router | Router |
| EMC | FCC, CE | N/A | N/A | N/A | N/A |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 | 10/100/1000 |
| Expansion Slots | N/A | NIM, SFP+ | N/A | NIM | N/A |
| Features | VPN, Firewall, QoS, PoE | VPN, Firewall, IPv6 Compatible, High Availability | VPN, IPv6 Compatible, Firewall | VPN, IPv6 Compatible, Firewall, Redundancy | VPN, Firewall, Integrated Services, Redundancy |
| Firewall Features | Yes | Yes | Yes | Yes | Yes |
| Flash Memory | 256 MB | 512 MB | 512 MB | 512 MB | 256 MB |
| Form Factor | Rack-mount | Rack-mount | Rack-mount | Rack-mount | Rack-mount |
| Height | 1.75 inches | 1.75 inches | 1.75 inches | N/A | 1.75 inches |
| High Availability Support | Supported | Supported | Supported | Supported | Supported |
| Integrated Services | Voice, Video | Voice, Video, WAN Optimization | Voice, Video, WAN Optimization | Voice, Video | Voice, Video |
| Interface Ports | RJ-45, SFP | RJ-45, SFP, Combo Ports | RJ-45, SFP | RJ-45, SFP | RJ-45, SFP |
| LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports | 4 LAN Ports |
| Management | Managed | Managed | Managed | Managed | Managed |
| Memory | 512 MB | 4 GB | 2 GB | 2 GB | 1 GB |
| Modular Slots Available | N/A | 3+ Slots | N/A | 3+ Slots | N/A |
| Network Protocols | IPv4, IPv6 | IPv4, IPv6, MPLS | IPv4, IPv6 | IPv4, IPv6, MPLS | IPv4, IPv6 |
| Power | 45 Watt | 150 W | 65 W | 50 Watt | 65 Watt |
| Power Source | AC Power Supply | AC Power Supply / Redundant | AC/DC Power Supply with Redundancy | Redundant AC/DC Power Supply | AC Power Supply / Redundant |
| Product Name | Cisco C921-4P Integrated Services Router | C931J-4P Enterprise Modular Router | C926-4P Enterprise Router | C921-4PLTEAS | C941J-4P |
| Product Type | Integrated Services Router | Enterprise Router | Enterprise Router | Integrated Services Router | Enterprise Router |
| QoS Features | Supported | Supported | Supported | Supported | Supported |
| Remote Management | SSH, Telnet, SNMP | SSH, SNMP, Telnet | SSH, Telnet, SNMP | CLI, SNMP, WebUI | SSH, HTTPS, SNMP |
| Routing Protocols | OSPF, EIGRP, RIP, BGP, Static Routing | OSPF / BGP / EIGRP / Static Routing | OSPF / BGP / EIGRP / Static Routing | OSPF / BGP / EIGRP / Static Routing | OSPF / BGP / RIP / Static Routing |
| Safety | UL, CE | N/A | IEC 60950 | N/A | N/A |
| Speed/Capacity | Gigabit | Gigabit | Gigabit | Gigabit | Gigabit |
| Stacking Capability | No | Yes | No | Yes | Yes |
| Telecom | TIA/EIA | N/A | N/A | N/A | N/A |
| Throughput Capacity | 250 Mbps | 2.5 Gbps | 1 Gbps | 1 Gbps | 1 Gbps |
| Use Case | Enterprise | Enterprise | Enterprise | Enterprise | Enterprise |
| VPN Support | IPSec, SSL VPN | IPSec / SSL VPN / GRE / DMVPN / FlexVPN | IPSec / SSL VPN | IPSec / SSL VPN | IPSec / SSL VPN |
| WAN Configuration | WAN | Dual WAN | Dual WAN | Dual WAN | Dual WAN |
| WAN Ports | 1 WAN | 2 WAN | 2 WAN | 1 WAN (Fixed) / 1 LTE | 4 WAN |
| Weight | 8 lbs | 11 lbs | 15 lbs | N/A | 6 lbs |
| Wi-Fi Standard | N/A | N/A | N/A | N/A | N/A |
| Width | 17.5 inches | 19 inches | 17 inches | N/A | 17 inches |
| Wireless Support | No | No | No | No | No |
Reviews & Ratings
M
Mera Xebelle
4
Excellent for small businesses. The integrated security features provide peace of mind, and the performance is top-notch for modern fiber-to-the-premise connections. Very satisfied.
V
Vulko Nereus
4
A robust and professional ISR. It's easy to deploy and the management interface is intuitive. Stability has been 100% across all our remote sites.
B
Black Manta
5
Compact power. This 900 series router handles our VPN tunnels flawlessly. It's a reliable and cost-effective solution for secure branch connectivity.
O
Orm Marius
4
Professional grade reliability. The 921 is a workhorse for our remote workers. It delivers consistent Gigabit speeds and excellent security features every day.
Questions & Answers
What is the Cisco C921-4P 900 Series Integrated Services Router?
The Cisco C921-4P is a compact, high-performance branch router offering integrated security, multilayer switching, and Power over Ethernet (PoE) connectivity for small to midsize offices.
Which connectivity options does the C921-4P support?
It supports four Gigabit Ethernet LAN ports with PoE+, one Gigabit Ethernet WAN port, USB, and optional LTE/4G cellular backup modules for reliable branch connectivity.
What is the maximum throughput of the C921-4P router?
The router delivers up to 85 Mbps of aggregate throughput, suitable for typical branch office traffic with integrated firewall and VPN services enabled.
Does the C921-4P provide PoE capabilities?
Yes. The four integrated Gigabit Ethernet LAN ports each deliver up to 30 W of PoE+ (802.3at) to power IP phones, wireless access points, and security cameras.
What security features are built into the C921-4P?
The router includes Cisco IOS Firewall, Zone-Based Policy Firewall, intrusion prevention, URL filtering, and advanced malware protection for complete branch security.
Which VPN protocols are supported by the C921-4P?
It supports IPsec VPN, SSL VPN, GRE, DMVPN, and FlexVPN, enabling secure site-to-site and remote-access connections.
How many VLANs and subinterfaces can the C921-4P handle?
The router supports up to 50 VLAN interfaces and 50 subinterfaces, allowing granular traffic segmentation and QoS configurations.
What power options and redundancy does the C921-4P offer?
It includes an internal AC power supply with voltage auto-sensing and supports dual power supplies for high availability in critical deployments.
Which WAN modules are compatible with the C921-4P?
Compatible WAN modules include HWIC-4G, VWIC2-2MFT-T1/E1, and EHWIC-4G-LTE for diverse cellular and T1/E1 connectivity requirements.
How do I set up and configure the C921-4P router?
Use Cisco Configuration Professional or CLI via console/SSH for step-by-step setup. Plug in WAN/LAN cables, power on, then follow the guided wizard or enter IOS commands.
What management and monitoring tools are available?
Manage centrally with Cisco DNA Center, Cisco Prime Infrastructure, or Cisco Meraki Dashboard. On-box SNMP, NetFlow, and Syslog support ensure full visibility.
Does the C921-4P run Cisco IOS Software?
Yes. It runs Cisco IOS XE, offering modular software for advanced routing, security, application optimization, and programmability.
What are the typical use cases for the C921-4P?
Ideal for small branch offices, retail stores, and healthcare clinics that require secure routing, PoE to endpoints, and reliable WAN failover.
What is the warranty and support policy for the C921-4P?
Cisco provides a limited lifetime hardware warranty, with optional solution support and software updates through Cisco SMARTnet contracts.
How does LTE/4G failover work on the C921-4P?
When primary WAN fails, the integrated LTE/4G module automatically establishes a cellular link, maintaining continuous connectivity without manual intervention.
Where can I purchase the Cisco C921-4P 900 Series router?
The C921-4P is available through authorized Cisco resellers, partners, and distributors. Contact your local Cisco representative for pricing and lead times.