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C1-CISCO4321/K9
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Cisco ONE ISR 4321 (2GE.2NIM.4G FLASH.4G DRAM.IPB)
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Name:
C1-CISCO4321/K9
- Description:
- Cisco ONE ISR 4321 (2GE.2NIM.4G FLASH.4G DRAM.IPB)
- Rating:
Added to cart 28 times recently
- Availability:
Ready to Ship
- Brand:
- Cisco
- GTIN:
- 0818242961542
- Condition:
Certified Refurbished
Professionally inspected, bench-tested, and firmware-verified, with configurations wiped. Restored to full working order and backed by our warranty.
- Warranty:
- 3
- List Price:
$3,745.00
- Price:
$1,970.0047.4% off
Quantity:
1
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C1-CISCO4321/K9 Overview
C1-CISCO4321/K9 is an enterprise-class integrated services router engineered with a modular architecture that supports a wide array of integrated services including voice, video, and WAN optimization. Built to deliver robust security and reliable connectivity, this router efficiently handles VPN features, advanced routing protocols, and firewall functions while ensuring performance and redundancy in mission‐critical applications.
C1-CISCO4321/K9 comes with versatile power options featuring an AC power supply with redundant capabilities, and its dual WAN configuration alongside modular LAN interfaces provide flexible connectivity. Designed for secure, high-performance networking, it offers integrated VPN support, high availability, and throughput capacity tailored to demanding enterprise and branch office use cases.
C1-CISCO4321/K9 price is $1,970.00, a 47.4% saving from the Cisco list price of $3,745.00. C1-CISCO4321/K9 is in stock and available for next-day dispatch. (terms applied)
Request bulk order quote for C1-CISCO4321/K9 for additional pricing. Browse the full Router Isr 4000 series or explore all Cisco products.
C1-CISCO4321/K9 Specifications
- Product Type
- Enterprise Router
- Brand
- Cisco
- VPN Support
- IPSec / SSL VPN / DMVPN / FlexVPN
- Power Source
- AC Power Supply with Redundant Options
- Routing Protocols
- OSPF / BGP / EIGRP / RIP / Static Routing
- Architecture
- Modular
- WAN Configuration
- Dual WAN
- WAN Ports
- 2 WAN
- LAN Ports
- Modular LAN
- Ethernet Technology
- 10/100/1000
- Connectivity Type
- Wired
- Network Protocols
- IPv4, IPv6
- Remote Management
- SSH / Telnet / SNMP
- Compliance Standards
- FCC / CE
- Wireless Support
- No
- Speed/Capacity
- Gigabit
- Firewall Features
- Yes
- Features
- VPN / VoIP / IPv6 Compatible / Firewall / WAN Optimization
- Use Case
- Enterprise
- Management
- Managed
- Form Factor
- Rack-mount
- Integrated Services
- Voice / Video / WAN Optimization
- High Availability Support
- Supported
- Throughput Capacity
- 0.15 Gbps
- QoS Features
- Supported
- Built-in Security Features
- Firewall / Intrusion Prevention
- Expansion Slots
- NIM / EHWIC
- Modular Slots Available
- 2 Slots
- Stacking Capability
- No
- 5G Support
- No
- Memory
- 1 GB
- Flash Memory
- 512 MB
- Interface Ports
- RJ-45 / SFP
- Power
- 110 W
- Device Type
- Router
- Product Name
- Cisco 4321 Integrated Services Router (C1-CISCO4321/K9)
- Height
- 1.75 inches
- Width
- 17.5 inches
- Depth
- 20 inches
- Weight
- 14 lbs
C1-CISCO4321/K9 Use Case
Secure Multi-site SD-WAN and Encrypted VPN for Retail Branches with C1-CISCO4321/K9
A national retail chain deploys Cisco ONE ISR 4321 (C1-CISCO4321/K9) routers at 100 locations to establish dynamic SD-WAN overlays and encrypted DMVPN connections to the corporate data center, optimizing POS transactions and inventory updates over dual 1 GbE links. Advanced QoS and IP routing modules ensure sub-10 ms failover while reducing MPLS leased-line costs by 45%. Benefit: Scalable, resilient branch connectivity with 99.99% availability and lower operational expenses.
High-Performance Cloud On-Ramp to AWS and Azure with Cisco ONE ISR 4321
A global financial services firm leverages the C1-CISCO4321/K9 Cisco ONE ISR 4321 to provision secure IPsec tunnels and BGP peering directly into AWS VPC and Azure ExpressRoute, providing low-latency access to Salesforce, Office 365, and trading platforms. Dual NIM slots support concurrent encryption and virtualized services, maintaining sub-20 ms WAN latency and ensuring compliance with FINRA regulations. Benefit: Accelerated SaaS performance, streamlined cloud migration, and robust security posture.
IoT Edge Security and Traffic Segmentation in Manufacturing Plants
An automotive manufacturer integrates C1-CISCO4321/K9 Cisco ONE ISR 4321 routers at multiple factory floors to segment Industrial IoT devices, PLC networks, and guest Wi-Fi using Zone-Based Firewall and VLAN tagging, while enabling 4G LTE backup for zero downtime. Built-in threat intelligence and real-time monitoring automate intrusion prevention and maintain continuous production line operations. Benefit: Enhanced IoT security with a 30% reduction in cyber incidents and uninterrupted manufacturing processes.
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Product Comparison Table 
| C1-CISCO4321/K9 |  C1-CISCO4451/K9 |  ISR4451-X/K9 |  ISR4331-AX/K9 |  ISR4461-AXV/K9 | |
|---|---|---|---|---|---|
| Architecture | Modular | Modular | Modular | Fixed / Modular | Modular |
| Compliance Standards | FCC / CE | FCC, CE | Safety: UL 60950-1, CAN/CSA C22.2 No. 60950-1, EN 60950-1, AS/NZS 60950-1, IEC 60950-1 / EMC: 47 CFR Part 15, ICES-003 Class A, EN55032 Class A, CISPR32 Class A, AS/NZS CISPR 32 Class A, VCCI V-3, CNS 13438, EN 300-386, EN 61000, EN 55024, CISPR 24, KN22, KN24 | FCC / CE / UL | FCC / CE / UL |
| Connectivity Type | Wired | Wired | Wired | Wired | Wired |
| Ethernet Technology | 10/100/1000 | 10/100/1000 | Gigabit Ethernet | 10/100/1000 | 10/100/1000 |
| Expansion Slots | NIM / EHWIC | EHWIC / NIM | 3 x NIM; 2 x SM-X; 1 x ISC; OIR for I/O modules | EHWIC / NIM | EHWIC / NIM |
| Form Factor | Rack-mount | Rack-mount | Rack-Mount 2U | Rack-mount | Rack-mount |
| High Availability Support | Supported | Supported | High Availability Supported | Supported | Supported |
| LAN Ports | Modular LAN | Modular LAN | 4 x 1GbE (configurable, shared with WAN) | 4 LAN Ports | 4 LAN Ports |
| Power | 110 W | 250 W | 100-240 VAC; 48-60V DC; 450W AC max; redundant PS optional | 65 Watts | 370W |
| Power Source | AC Power Supply with Redundant Options | AC Power Supply / Redundant | AC or DC | AC Power Supply | AC Power Supply / Redundant |
| Product Name | Cisco 4321 Integrated Services Router (C1-CISCO4321/K9) | Cisco 4451 Integrated Services Router | Cisco ISR 4451-X Integrated Services Router | Cisco ISR4331-AX/K9 | Cisco ISR 4461 Integrated Services Router |
| Product Type | Enterprise Router | Enterprise Router | Enterprise Router / Branch Router / SD-WAN Router / VPN Router | Enterprise Router | Enterprise Router |
| QoS Features | Supported | Supported | CBWFQ; WRED; Hierarchical QoS; PBR; NBAR | Supported | Supported |
| Remote Management | SSH / Telnet / SNMP | CLI, SNMP, Telnet, SSH | CLI / Web GUI / SNMP / NETCONF / Cloud Dashboard / Controller | SSH / Telnet / SNMP | SSH / Telnet / SNMP |
| Routing Protocols | OSPF / BGP / EIGRP / RIP / Static Routing | OSPF / BGP / EIGRP / MPLS / IS-IS / RIP / Static Routing | BGP / EIGRP / IS-IS / OSPF / RIP / LISP / Static Routing | OSPF / BGP / EIGRP / MPLS / RIP / Static Routing | OSPF / BGP / EIGRP / IS-IS / RIP / Static Routing |
| Use Case | Enterprise | Enterprise | Enterprise / Branch Office | Enterprise / Branch | Enterprise |
| VPN Support | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / GRE / DMVPN / FlexVPN / N/A | IPsec / DMVPN / GETVPN / GRE / VPN License Required | IPSec / SSL VPN / DMVPN / FlexVPN | IPSec / SSL VPN / DMVPN / FlexVPN |
| WAN Configuration | Dual WAN | Dual WAN | Multi-WAN / Modular WAN | Dual WAN | Dual WAN |
| WAN Ports | 2 WAN | Modular WAN | 4 x 1GbE (configurable WAN/LAN) | 2 WAN | 2 WAN |
Compliance & Warranty
100% Genuine Product Guarantee
Every unit is authentic, sourced through trusted and authorised channels, and serial-verified on request. Genuine networking and IT hardware, guaranteed, or your money back.
Up to 3-Year Warranty Coverage
New products are backed by up to 3 years of extended warranty, and certified refurbished units by up to 3 months, for dependable protection on every order. Coverage is clear, honoured in full, and confirmed on each product page.
Hassle-Free RMA & Returns
If a unit ever falls short, our streamlined RMA process gets a replacement to you fast, with advance replacement available to keep your network running. No jargon, no runaround.
Rigorously Tested & Quality Assured
Every device is inspected, bench-tested, and firmware-verified, with configurations wiped before dispatch. Additional testing can be arranged to confirm full working condition on request.
Expert Technical Support
Our specialists assist with compatibility, configuration, licensing, and installation, before and after you buy. Real hardware expertise, whenever you need it.
Fast Global Delivery
dispatched quickly and shipped worldwide from regional hubs, fully tracked and insured.
Reviews & Ratings
M
Michael Harrington
5
Cisco ONE licensing made rollout simple. Performance has been stable and well suited for branch routing needs.
D
Daniel Whitmore
5
Reliable ISR for small branches. Easy to manage and integrates smoothly into existing Cisco environments.
R
Robert Ellison
5
Consistent uptime and predictable performance. A solid entry level enterprise router.
J
James Thornton
5
Straightforward deployment with good routing capacity. Meets daily business requirements.
A
Andrew Collins
5
Cisco quality hardware with dependable results. No operational issues so far.
Questions & Answers
What is the Cisco ONE ISR 4321 and what makes it unique?
The Cisco ONE ISR 4321 is an integrated services router featuring two Gigabit Ethernet ports, two NIM slots, 4 GB flash, 4 GB DRAM, and an IP Base license, designed for secure, high-performance, and scalable connectivity in small branch and enterprise edge networks.
What key technical specifications should I know about the Cisco ONE ISR 4321?
The Cisco ONE ISR 4321 delivers up to 50 Mbps encrypted throughput with a dual-core 1.2 GHz CPU, two GE ports, two NIM slots, 4 GB DRAM, 4 GB flash, IP Base licensing, and support for Cisco DNA Center and SD-WAN features.
Which licensing options are available for the Cisco ONE ISR 4321?
The product includes the IP Base license and supports optional IP Services, Security, and AppX licenses for advanced routing, VPN, firewall, and application optimization, allowing tailored feature sets to match evolving network demands.
How do I install and set up the Cisco ONE ISR 4321 in my network?
Mount the ISR 4321 on a rack or wall plate, connect AC or optional DC power, attach network cables to the GE ports, access the Cisco IOS CLI via console for initial configuration, and deploy WAN, LAN, and security settings using Prime Infrastructure or Cisco DNA Center.
What performance can I expect from the Cisco ONE ISR 4321?
The ISR 4321 offers up to 50 Mbps of IPsec VPN throughput, 100 Mbps of aggregate data routing, up to 25,000 concurrent sessions, and hardware-accelerated encryption, ensuring reliable performance in small branch and enterprise edge scenarios.
What network modules are supported by the Cisco ONE ISR 4321?
Cisco ONE ISR 4321 supports two NIM slots compatible with serial, T1/E1, xDSL, 4G LTE, and fiber WAN modules, delivering flexible connectivity options to meet diverse branch office requirements.
Does the Cisco ONE ISR 4321 support SD-WAN functionality?
Yes, with the optional Cisco SD-WAN subscription, the ISR 4321 enables zero-touch provisioning, centralized policy control, secure overlay tunnels, and application-aware routing across multiple WAN links.
How does the Cisco ONE ISR 4321 ensure network security?
The router integrates stateful and zone-based firewalls, IPsec VPN encryption, Secure Boot, a Trusted Platform Module, and optional Cisco Umbrella DNS protection, providing multi-layered defense for branch offices.
What is the power consumption of the Cisco ONE ISR 4321?
The ISR 4321 consumes up to 28 Watts, supports AC and optional DC power inputs, and features an energy-efficient design that complies with global safety and electromagnetic standards.
What are the environmental operating conditions for the Cisco ONE ISR 4321?
It operates between 0–40 °C (32–104 °F) at 10–90% non-condensing humidity, meets NEBS Level 3 and ETSI standards, and is suitable for standard office and telecom room environments.
How does the Cisco ONE ISR 4321 support redundancy and high availability?
It offers redundant WAN connectivity via dual GE ports or NIM modules, supports HSRP for gateway failover, and allows dual power inputs to ensure uninterrupted network service.
What management tools can I use with the Cisco ONE ISR 4321?
You can manage the ISR 4321 via Cisco IOS CLI, Cisco Prime Infrastructure, Cisco DNA Center, SD-WAN vManage, and RESTful APIs for streamlined deployment, configuration, and monitoring.
What warranty and support options are available for the Cisco ONE ISR 4321?
Cisco provides a limited lifetime hardware warranty with 8×5×NBD replacement; software updates, advanced technical support, and enhanced SLAs are available through Cisco SMARTnet service contracts.
Can I upgrade the memory and storage on the Cisco ONE ISR 4321?
Yes, you can expand the DRAM up to 8 GB with Cisco-approved SODIMM modules and increase flash storage by installing a higher-capacity flash module in the dedicated flash slot.
What are the common use cases for the Cisco ONE ISR 4321?
Use cases include secure branch routing, SD-WAN edge, VPN gateway, voice and video services, cloud connectivity, and managed service applications for small offices and retail environments.
How do I configure IPsec VPN on the Cisco ONE ISR 4321?
Define IKEv2 policies, pre-shared keys or certificates, and crypto maps using the CLI or Prime Infrastructure, then apply these configurations to the WAN interface to establish secure IPsec VPN tunnels.
Where can I purchase the Cisco ONE ISR 4321 and accessories?
You can order the Cisco ONE ISR 4321, power supplies, network modules, and software licenses from Cisco authorized resellers, the Cisco online store, and vetted partner marketplaces.