The Cisco ISR4351/K9 is a flagship 2RU (2 Rack Unit) platform in the 4000 Series Integrated Services Router family. Designed for high-end branch offices and regional sites, it delivers a massive leap in performance and intelligence compared to older generation routers.
At SKYRS Pakistan, we provide the full range of Cisco ISR 4000 variants, ensuring that your enterprise backbone is powered by the most reliable hardware in the industry.
The ISR 4351 is built on a multicore CPU architecture that separates the data, control, and service planes to ensure that performance remains consistent even when multiple heavy services are running.
| Feature | Specification Details |
| Aggregate Throughput | 200 Mbps (Default) / 400 Mbps (Performance License) |
| Onboard WAN/LAN Ports | 3 x 10/100/1000 Mbps (RJ-45 and SFP combo) |
| NIM Slots | 3 (Network Interface Modules) |
| SM-X Slots | 2 (Enhanced Service Modules) |
| Memory (DRAM) | 4 GB Default / 16 GB Max |
| Flash Memory | 4 GB Default / 16 GB Max |
| Rack Height | 2 RU |
| Power Supply | Internal AC, DC, and PoE options available |
Depending on your branch size and throughput needs, we offer various bundles and hardware configurations:
ISR4351/K9: The standard IP Base model for general routing.
ISR4351-SEC/K9: Security bundle including firewall, IPS, and advanced encryption (IPSec VPN).
ISR4351-V/K9: Unified Communications (Voice) bundle for VoIP integration.
ISR4351-VSEC/K9: The comprehensive “Voice + Security” bundle, ideal for secure enterprise voice environments.
ISR4351-AX/K9: “Application Experience” bundle with WAAS (WAN Optimization) and Application Visibility.
Proper physical installation is critical for 2RU devices to ensure longevity and thermal stability.
Rack Mounting: Secure the router into a standard 19-inch rack using the provided brackets. Ensure there is at least 3 inches of clearance around the cooling vents (airflow is side-to-side/back-to-side).
Powering Up: Connect the AC or DC power cord. If your deployment requires Power over Ethernet (PoE) for connected devices like IP phones, ensure the PoE-capable power supply is installed.
Module Insertion: NIMs and SM-X modules can be inserted into the front-facing slots. These modules support OIR (Online Insertion and Removal), meaning you can swap some modules without powering down the unit (check specific module documentation).
The ISR4351 runs on Cisco IOS XE, which uses a Linux-based kernel to manage resources more efficiently than the classic IOS.
Connect via the RJ-45 or Mini-USB console port using a terminal emulator (like PuTTY) set to 9600 baud.
Bash
Router> enable
Router# configure terminal
Router(config)# hostname SKYRS-PAK-R1
Router(config)# interface GigabitEthernet 0/0/0
Router(config-if)# ip address 192.168.1.1 255.255.255.0
Router(config-if)# no shutdown
To upgrade from 200 Mbps to 400 Mbps, you must activate the performance license:
Router(config)# platform hardware throughput level 400000
Router(config)# exit
Router# copy running-config startup-config
Router# reload
SKYRS is your premier source for Cisco hardware in Pakistan. We don’t just sell boxes; we provide the local expertise required to design and maintain your network.
Stock Status: Ready stock available in Karachi, Lahore, and Islamabad.
Warranty: Full local support and replacement warranty.
Professional Services: Remote or on-site configuration and deployment by certified engineers.
Finding the best Cisco ISR4351/K9 Router equipment for call center call centre in Pakistan requires reliable hardware that manages high voice traffic. Skyrs stands as the premier vendor in Pakistan providing the versatile ISR4351/K9 router series for enterprise needs. This model excels in software houses and communication hubs across major Pakistani cities.
The Cisco ISR4351/K9 functions as a powerful modular platform for converged branch services. It manages network, compute, and WAN services seamlessly within a 2RU form factor. This router supports high-density voice and data applications for platforms like Zoom and RingCentral.
Throughput Performance: The ISR4351/K9 throughput limit starts at 200 Mbps aggregate. You can increase this to 400 Mbps via a performance license. For extreme needs, the Boost License pushes performance beyond 2 Gbps.
Memory and Storage: The ISR4351/K9 series memory upgrade allows expansion up to 16 GB DRAM. The default 4 GB flash is also upgradable to 16 GB for complex configurations.
Interfaces: It features 3 onboard WAN/LAN 10/100/1000 ports and 3 NIM slots.
Modern Licensing: Use the ISR4351/K9 security license activation to enable robust firewall and VPN features.
Managing your hardware requires following the official ISR4351/K9 configuration guide for stable deployments. Perform an ISR4351/K9 ROMMON update to ensure compatibility with the latest IOS-XE releases. Always verify your hardware using the official datasheet to confirm -8T-2G-L datasheets download specifications.
Note on Lifecycle: The ISR4351/K9 series EOSL date 2025 marks the end of software maintenance. However, Skyrs continues to provide support and the ISR4351/K9 series used price 2026 remains highly competitive.
When comparing router routing Cisco equipment with brands like Mikrotik, Huawei, and Aruba, Cisco leads in reliability.
| Feature | Cisco ISR4351/K9 | MikroTik / Ruijie / H3C |
| Security | Advanced Layer 7 Inspection | Basic Firewalling |
| Reliability | High MTBF for 24/7 Call Centers | Variable Hardware Quality |
| Support | Global TAC & Local Vendor Skyrs | Community Forums |
| Expansion | Modular NIM/SM-X Slots | Often Fixed Port Density |
While Palo Alto excels in pure security, Cisco provides a better balance for voice-heavy call center environments.
Skyrs offers the best Cisco router price in Pakistan with nationwide shipping and installation support.
Cisco ISR4351/K9 router price in Karachi: Call for the latest stock and discounts.
Cisco ISR4351/K9 router price in Peshawar & KPK: Localized support for northern regional hubs.
Cisco ISR4351/K9 router price in Faisalabad & Quetta: Reliable shipping for textile and trade sectors.
Buy cisco equipment Lahore/Islamabad: Visit our offices for a Cisco ISR4351/K9 router bulk quote.
Cisco equipment configuration guide: Access our library for Cisco VLAN configuration steps.
How to reset cisco equipment router: Follow our guide for factory resets and password recovery.
Cisco firmware update download: Ensure your system is patched with the latest stable releases.
Cisco KX-HDV430 PoE power budget: Calculate power requirements for integrated IP phone systems.
External Link: Official Cisco ISR 4000 Series Datasheet
Internal Link: View ISR4351/K9 at Skyrs.com.pk
Q: What is the maximum throughput for the ISR4351/K9?
A: It supports 200 Mbps by default, upgradable to 400 Mbps or 2 Gbps+ with specific licenses.
Q: Does the ISR4351/K9 support PoE for IP Phones?
A: Yes, with an optional PoE power supply and supported modules.
Q: Is Skyrs an authorized cisco equipment series distributor in Pakistan?
A: Skyrs is a leading provider specializing in Cisco solutions for call centers and software houses.
Q: Can I still use this router after the 2025 EOSL date?
A: Yes, the hardware remains functional, and Skyrs provides refurbished units and technical support through 2026.
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