The Cisco 4000 series integrated services routers (ISR) include a revolutionary converged branch platform with industry-leading network, compute, and WAN services. These routers can seamlessly extend cloud services across remote sites, and help you accelerate the digitization of your business. Use the 4000 series to effectively transition to a hybrid WAN architecture. Cisco 4000 series ISRs introduce chassis, modules, and WAN services with a robust management framework and validated designs for
| Platform | Cisco ISR 4351, modular branch router |
| Throughput | 200 Mbps base, up to 400 Mbps with Performance license |
| Bundle | AX (Application Experience: AppX + Security feature set) |
| Integrated interfaces | 4x 1G (2x RJ-45 + 2x SFP combo), console, AUX, USB |
| Expansion | NIM and SM-X modular slots for WAN/LAN/compute |
| Power and form factor | AC power, 2RU rack-mount |
| Application services | AppX for AVC (NBAR2), WAAS Express, PfR, NetFlow |
| Security | Zone-based firewall, IDS/IPS, AMP/URL filtering (licenses), TrustSec ready |
| VPN and crypto | IPsec, DMVPN, FlexVPN, GETVPN with hardware crypto acceleration |
| Routing | Dual-stack IPv4/IPv6, MPLS, BGP/OSPF/EIGRP/IS-IS, NAT, QoS |
| SD-WAN | IOS XE SD-WAN capable (controller-based) |
| Voice readiness | CUBE/SRST support via licenses; PVDM4 DSP modules optional |
| Memory and storage | 4 GB DRAM, 8 GB Flash standard (upgrade options available) |
| Management | Cisco DNA Center, vManage (SD-WAN), NETCONF/RESTCONF, SNMP, CLI |
| Environmental | Operating 0 to 40 C; typical branch office environment |
| High availability | Optional redundant PSU, field-replaceable fans, ISSU on IOS XE |
Yes, the Cisco ISR4351-AX/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 ISR4351-AX/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 ISR4351-AX/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 ISR4351-AX/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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