The Cisco 4000 Series contains six platforms: the 4451, 4431, 4351, 4331, 4321 and 4221 ISRs (Figure 1).
| Platform | Cisco ISR 4221 (4000 Series) |
| Security license | SEC/K9 (IPsec VPN, ZBFW, Advanced Encryption) |
| Aggregate throughput | 35 Mbps base, up to 75 Mbps with Performance license |
| Integrated LAN/WAN ports | 2 x 10/100/1000 RJ-45 |
| Modularity | 1 x NIM slot, 1 x PVDM4 DSP slot |
| Memory/Storage | 4 GB DRAM, 4 GB Flash (upgradeable) |
| Routing performance | 35 Mbps base, up to 75 Mbps with Performance (Boost) license |
| Interfaces | 2 x GE RJ-45 LAN/WAN; RJ-45 console; USB 2.0 Type-A; mini-USB console |
| Expansion | 1 x NIM slot; 1 x internal PVDM4 slot for voice/UC |
| Security/crypto | Hardware-accelerated IPsec/AES; DMVPN; GETVPN; ZBFW (with SEC license) |
| Voice/UC readiness | SRST/CUBE supported with PVDM4 and appropriate licenses |
| Operating system | Cisco IOS XE (unified software image, feature-licensed) |
| High availability | Online Insertion and Removal (OIR) for NIM; ISSU via IOS XE (where supported) |
| Power | Fixed AC PSU (100–240 VAC, 50/60 Hz) |
| Form factor | 1RU, compact/half-width desktop or rack-mount (with brackets) |
| Environmental | Operating temp 0 to 40°C; nonoperating humidity 5–95% RH |
Yes, the Cisco 4221 ISR Security Router - ISR4221-SEC/K9 is currently in stock and available for immediate shipment from our Boulder, CO warehouse. Same-day shipping on orders placed before 2pm MT.
This ISR4221-SEC/K9 is professionally refurbished or new-surplus enterprise hardware. Every unit is fully tested, factory-reset, and inspected before shipping. Cosmetic blemishes (rack marks, minor scuffs) may be present but never affect functionality.
The ISR4221-SEC/K9 comes with the Eldo Systems Lifetime Warranty covering hardware defects. We are an independent reseller — manufacturer warranties do not apply, but our lifetime coverage matches or exceeds typical OEM terms.
Free ground shipping on every order, included in the price. Orders ship same-day if placed before 2pm MT (Mon–Fri). Expedited overnight and 2-day options are available at checkout for urgent deployments.
Yes — we ship worldwide. International orders are quoted individually so we can present accurate freight, duties, and lead time. Use the Request a Quote form or call (484) 630-1533 to start.
Absolutely. We offer volume discounts and project pricing for resellers, integrators, and end-users buying in quantity. Submit a quote with your target quantity and our team will respond within 15 minutes during business hours.
Get the ISR4221-SEC/K9 from Eldo Systems with lifetime warranty and free ground shipping.
Independent Reseller Notice: Eldo Systems is an independent reseller of refurbished and new-surplus enterprise networking equipment. We are not affiliated with, authorized by, or endorsed by Cisco, Juniper, Arista, HPE, Dell, Meraki, Fortinet, Mellanox, NVIDIA, Finisar, or any other manufacturer listed on this site. All product names, logos, and brands are property of their respective owners. All products sold are refurbished or new-surplus unless otherwise noted. Manufacturer warranties do not apply; all items are covered by the Eldo Systems Lifetime Warranty.
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