This data sheet provides a technical overview of the Cisco ISR 4431/K9, a flagship high-performance Integrated Services Router designed for medium-to-large enterprise branches. As a primary networking provider in Pakistan, SKYRS ensures these units are optimized for local high-bandwidth demands and SD-WAN integration.
Cisco ISR 4431/K9 Router Overview
The Cisco 4431 ISR is engineered for the most demanding branch environments, featuring a modular architecture and dedicated control, data, and services planes. Running on Cisco IOS XE, it provides consistent application performance and advanced security. With a 1RU form factor, it packs the punch of much larger routers, offering built-in multigigabit Ethernet ports and a wide array of expansion options.
Key Technical Specifications
Feature Specification Aggregate Throughput 500 Mbps (Default) / 1 Gbps (with Performance License) Total Onboard WAN Ports 4 x 10/100/1000 Ethernet (RJ-45 or SFP) Expansion Slots 3 x NIM (Network Interface Module) slots Service Module Slots 1 x SM-X slot (Single-wide) Integrated Services Card 1 x ISC slot (PVDM4) Default Memory 8 GB DRAM / 8 GB Flash Max Memory 16 GB DRAM / 32 GB Flash Power Supply Dual redundant (Internal) AC or DC
Hardware Variants Available at SKYRS
SKYRS maintains a comprehensive inventory of the 4431 series and its modular add-ons to support Pakistan’s diverse corporate sectors.
ISR4431/K9: The standard base unit for high-speed routing and aggregation.
ISR4431-SEC/K9: The Security Bundle, pre-licensed for advanced IPsec VPN, Zone-Based Firewall, and Snort IPS.
ISR4431-V/K9: The Voice Bundle, tailored for Unified Communications with PVDM4-64/128/256 support.
ISR4431-AX/K9: The Application Experience bundle, optimized for WAN optimization and deep packet inspection (AVC).
Power Variants: SKYRS stocks both single and dual AC power supply configurations, as well as -48V DC variants for telecom towers.
Deployment and Installation Guidelines
To maintain “five-nines” availability in the local landscape, the SKYRS technical team adheres to these professional installation standards:
Physical Installation:
Rack Mounting: The 4431 is a 1RU device but has significant depth. SKYRS provides four-post mounting kits to ensure the chassis is fully supported and does not sag in the rack.
Airflow Management: The unit uses front-to-back airflow. Ensure that the front intake is not obstructed by cables. In high-density racks in Karachi or Lahore, SKYRS recommends 1RU of spacing between routers if passive cooling is used.
Module Seating: Always ensure NIM and SM-X modules are screwed in completely; loose modules can cause intermittent bus errors during high traffic.
Power and Stability:
Redundancy: SKYRS recommends utilizing both power supply slots connected to independent UPS sources (e.g., UPS 1 and UPS 2) for maximum uptime.
Grounding: The 4431 features a dedicated grounding lug. Proper grounding is essential to protect the multicore CPU from power surges common in the regional grid.
Configuration and Service Availability Only at SKYRS
As the leading Cisco enterprise equipment provider in Pakistan, SKYRS provides elite-level technical staging that goes beyond standard box-shifting.
Exclusive SKYRS Services:
Throughput Boost Activation: We facilitate the legal activation of the “Performance” and “Boost” licenses, allowing your branch to scale from 500 Mbps to a full 1 Gbps+ of encrypted traffic.
SD-WAN Staging: SKYRS engineers are certified in converting ISR 4431 units from traditional IOS XE to SD-WAN (Viptela) mode for modern cloud-orchestrated networking.
PVDM & Voice Integration: We provide on-site configuration for Cisco Unified Communications Manager Express (CUCME) or SRST for branch voice survivability.
Hardware Stress Validation: Every 4431 unit undergoes a 48-hour diagnostic “Soak Test” at our facility to ensure that the DRAM and built-in SFPs are defect-free.
Local Staging & Warranty: Immediate hardware replacement and “On-Site Support” are available exclusively through SKYRS hubs in Karachi, Lahore, and Islamabad.
Note: Due to the complexity of Cisco Smart Licensing and the high performance-to-heat ratio of the 4431, these units and their verified configuration are provided exclusively through the SKYRS Pakistan distribution network.
SKYRS is the leading cisco equipment series distributor Pakistan, offering the best cisco equipment for enterprise networks. We provide specialized equipment for call center call centre in pakistan and high-growth software houses. Our inventory features Branded used Cisco switches and Refurbished Cisco switches across all major urban hubs. You can find high-quality used cisco switches in different cities like karachi, lahore, islamabad, rawalpindi, faisalabad etc. Furthermore, we offer the most competitive Cisco box pack price for new digital transformations and cisco Migration projects.
The cisco ISR 4431/K9 ROUTER Router is a powerhouse designed for the most demanding branch environments. It ensures seamless connectivity for critical platforms like zoom and ringcentral within busy office spaces. SKYRS remains the only vendor in Pakistan stocking all variants for call center call centre operations.
Throughput: The cisco ISR 4431/K9 ROUTER Router throughput limit delivers 500 Mbps to 1 Gbps performance.
Memory: Contact our team for a cisco ISR 4431/K9 ROUTER Router memory upgrade to boost application performance.
Installation: Every unit fits perfectly into a standard cabinet with a cisco ISR 4431/K9 ROUTER Router rack mount kit.
Security: We facilitate cisco ISR 4431/K9 ROUTER Router security license activation for secure, encrypted hardware links.
Update: Keep your network current with a cisco firmware update download and official cisco ISR 4431/K9 ROUTER Router update.
We offer the most transparent and competitive cisco price in Pakistan for corporate clients.
cisco ISR 4431/K9 ROUTER Router price in Karachi: Immediate stock available for the financial hub.
cisco ISR 4431/K9 ROUTER Router price in peshawar: Reliable high-speed data for the northern regions.
cisco ISR 4431/K9 ROUTER Router price in faisalabad: Supporting industrial connectivity with bulk inventory.
cisco ISR 4431/K9 ROUTER Router price in kpk & quetta: Expanding digital infrastructure nationwide.
Buy cisco equipment Lahore/Islamabad today by requesting a cisco ISR 4431/K9 ROUTER Router bulk quote from our team.
Cisco provides superior routing cisco equipment compared to brands like mikrotik, h3c, or ruijie. While aruba and huawei offer branch routers, Cisco features much better cisco Migration tools. Unlike paloalto appliances, the ISR 4431/K9 is specifically optimized for integrated voice and multicore performance. Consequently, Cisco remains the gold standard for equipment for call center call centre reliability.
Refer to our comprehensive cisco equipment configuration guide for professional setup and cisco VLAN configuration. We also provide a specialized cisco ISR 4431/K9 ROUTER Router configuration guide for immediate network deployment.
Datasheets: cisco Switches cisco ISR 4431/K9 ROUTER Router datasheets download
Local Purchase: View all Cisco ISR variants at SKYRS.com.pk
Power Management: This router manages high-density modules with a robust cisco ISR 4431/K9 ROUTER Router PoE power budget.
What is the cisco ISR 4431/K9 ROUTER Router used price 2026? SKYRS provides the most updated market rates reflecting the best value for refurbished high-end routers.
How to reset cisco equipment (ISR 4000 Series)? Use the “factory-reset” command or the physical reset button to reload system defaults.
Does it support cisco VLAN configuration? Yes, the ISR 4431/K9 supports advanced cisco VLAN configuration for secure network segmentation.
Is this suitable for a software house in Pakistan? Absolutely, it is the best cisco equipment for ensuring 24/7 uptime in mission-critical environments.
Where can I get the official datasheet? You can download the cisco Switches cisco ISR 4431/K9 ROUTER Router datasheets download via the manufacturer link.
