The modular Cisco 4000 Series Integrated Services Routers (ISRs) delivers LAN and WAN connectivity, and offer Network Interface Module (NIM) slots as well as Enhanced service module (SM-X) slots. These slots support a plethora of modules that include LAN, WAN, and Wireless Interfaces, and a range of Compute engines that enable embedded services. With its licenses, the ISR4431-SEC/K9 model comes with Security Bundle that offers IP Base + Advanced Security: Zone Based Firewall, IPSec VPN, EZVPN,
| Aggregate throughput | 500 Mbps base, up to 1 Gbps with Performance license |
| WAN/LAN ports | 2 x 1GE (RJ-45/SFP combo) |
| Expansion | 3 x NIM, 1 x SM-X |
| Memory | 4 GB DRAM, 8 GB flash (default) |
| Security license | SEC (ZBFW, IPsec, AVC) |
| Power/Redundancy | Single AC standard; optional dual hot-swappable PSUs |
| Aggregate service throughput | 500 Mbps default; 1 Gbps with Boost/Performance license |
| Built-in interfaces | 2 x 1GE (RJ-45/SFP combo), USB 2.0, RJ-45 and mini-USB console |
| Interface slots | 3 x NIM, 1 x SM-X |
| DRAM | 4 GB (expandable to 16 GB) |
| Flash memory | 8 GB (expandable) |
| Encryption acceleration | Hardware IPsec and MACsec (license dependent) |
| VPN capacity | Up to 2,000 IPsec tunnels |
| Software features | App visibility, PfR, AVC, WAAS (with licenses) |
| Power | AC PSU; optional dual AC/DC hot-swappable |
| Form factor | 1RU rack; approx. 44 x 438 x 470 mm (1.73 x 17.2 x 18.5 in) |
Yes, the Cisco ISR4431-SEC/K9 Router is currently in stock and available for immediate shipment from our Boulder, CO warehouse. Same-day shipping on orders placed before 2pm MT.
This ISR4431-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 ISR4431-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 ISR4431-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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