Cisco ISR4351/K9 Full English Product Description
Product Overview
TheCisco ISR4351/K9is a 2RU rack-mount modular integrated services router from Cisco ISR 4000 Series, designed for medium-to-large enterprise branch offices, multi-site retail chains, healthcare campuses, and hybrid WAN edge deployments with heavy converged data, voice, video, and security workloadsCisco. It adopts a separated multi-plane architecture (data, control, service planes) powered by Cisco IOS XE, integrating native SD-WAN, hardware-accelerated security, unified communications, and edge NFV virtualization on one compact chassis. The base SKU ISR4351/K9 comes factory-equipped with internal auto-ranging AC power supply and embedded K9 crypto security feature set, offering richer expansion slots and higher throughput capacity compared to ISR4331 modelsnetworking....
Core Hardware Specifications
Fixed Onboard Interfaces
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3 × 10/100/1000BASE-T Gigabit Ethernet ports:
1 combo GE port (shared RJ45 copper / SFP fiber slot), 1 fixed RJ45 GE, 1 fixed SFP-only GE uplink
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1 × USB 2.0 Type-A port for zero-touch provisioning, file storage and logging export
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Dual management console: Mini-USB Type B serial console + standard RJ45 console port
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RJ45 auxiliary port for out-of-band remote access via modem
Expansion Slots (Key Upgrade vs ISR4331)
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3 × hot-swappable NIM (Network Interface Module) slots for T1/E1, xDSL, serial leased line, LTE wireless gateway, and PoE switch modules
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2 × single-wide SM-X enhanced service module slots (double the capacity of ISR4331) for high-density voice DSP blades, WAN optimization, or high-speed switching extensions
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1 × internal ISC slot for dedicated crypto acceleration engine
Memory & Storage
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Default: 4 GB ECC DDR3 DRAM, expandable up to maximum 16 GB
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Default: 4 GB industrial-grade flash storage, upgradable to 16 GB for IOS XE images, virtual workloads and local logs
Throughput Performance
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Baseline unlicensed aggregate routing throughput: 200 Mbps
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Performance license upgrade unlocks full 400 Mbps multi-service throughput
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Boost license enables over 2 Gbps CEF-only forwarding and up to 500 Mbps encrypted VPN throughput for massive SD-WAN and IPsec traffic
Power & Physical Form Factor
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Form factor: 2 Rack Units (2RU), standard 19-inch rack mount brackets included
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Internal single AC power supply, supports optional redundant dual power supplies for high availability
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AC input range: 100–240 VAC auto-ranging, 47–63 Hz
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Max chassis power draw: ~200 W; compatible with PoE-capable NIM/SM modules via power supply upgrade
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Operating temperature range: 0°C to 40°C (32°F–104°F)
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Dimensions (H × W × D): 43.9 mm × 438.15 mm × 507.2 mm
Built-In Functional Capabilities
1. Cisco IOS XE SD-WAN & Intelligent WAN
Fully native SD-WAN stack supporting hybrid multi-link transport (MPLS, broadband fiber, 4G/5G LTE backup). It delivers application-aware routing, dynamic traffic steering, real-time path quality monitoring, centralized orchestration via Cisco vManage or DNA Center, and mass zero-touch provisioning (ZTD) for distributed branch rollouts. Supports cloud on-ramp and group-based segmentation for multi-tenant branch environments.
2. Hardware-Accelerated Enterprise Security (K9 Crypto Included)
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AES-256 hardware acceleration for IPsec site-to-site VPN and SSL remote access VPN
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Zone-Based Firewall (ZBFW), embedded Firepower IPS, URL filtering, malware threat defense
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Trustworthy Systems secure boot, runtime image integrity validation, FIPS 140-2 compliant crypto modules
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Local secure internet breakout to reduce central data center backhaul congestion
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Control Plane Policing (CoPP) and AVC Application Visibility & Control for threat identification
3. Unified Communications (UC)
Compatible with PVDM4 digital signal processor modules to support VoIP trunking, video conferencing, Cisco SRST, CME and CUBE unified border element, catering to full branch telephony deployments with dense IP phone endpoints.
4. Edge Virtualization & NFV
Supports Cisco NFVIS virtualization infrastructure, allowing deployment of virtual network functions (vFirewall, vWAN optimizer, monitoring agents) directly on the router without standalone branch servers, consolidating hardware footprint and cutting operational expenses. All NIM/SM modules support Online Insertion and Removal (OIR) for live service expansion without chassis reboot.
Software & Licensing
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Operating System: Modular modern Cisco IOS XE
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Base IP Base feature set preloaded: static routing, OSPF, EIGRP, basic NAT and ACL
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Optional subscription add-on licenses: Performance Boost, Security, SD-WAN, DNA Advantage, Unified Communications
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Lifecycle status: End-of-Sale since Nov 7, 2023; official Cisco TAC support terminates Nov 30, 2028. Recommended replacement: Cisco C8300 series edge routers
Typical Deployment Scenarios
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Medium & large enterprise branch offices with 200–400 Mbps multi-service bandwidth demand
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Multi-location retail, hospitality and healthcare sites requiring converged routing, voice, security and SD-WAN
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Campus remote building edge aggregation with multi-WAN fiber/copper connectivity
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Industrial and commercial sites needing dense modular expansion for leased-line or LTE backup
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Distributed branches deploying virtualized network functions and secure direct internet breakout
Core Differentiator vs ISR4331/K9
The ISR4351/K9 doubles service module capacity (2 SM-X slots vs 1), adds one extra NIM slot, raises baseline throughput to 200 Mbps (vs 100 Mbps), supports redundant AC power supplies, and delivers higher concurrent multi-service performance for larger, higher-traffic branch environments.
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