Cisco ISR4321-VSEC/K9 ISR4321 Gigabit Router ISR4321-VSEC/K9 NoClock BUG Issue ISR4321VSEC/K9

Description:

The Cisco ISR4321-VSEC/K9 Integrated Services Router is used in enterprise branch networking systems to provide secure WAN connectivity, routing, and advanced network services. Commonly installed in corporate branch offices, retail networks, financial institutions, and distributed enterprise infrastructures requiring secure gigabit routing and VPN capabilities. Maintenance teams, network administrators, and system integrators use this router for network expansion, infrastructure upgrades, replacement of legacy routing platforms, or resolution of hardware issues such as NoClock related failures.

Applications:

The Cisco ISR4321-VSEC/K9 Router is deployed in enterprise and branch office network infrastructures to deliver secure WAN connectivity, VPN encryption, and integrated routing services for business-critical communications. It is commonly used in corporate branch networks, retail chain locations, banking systems, and distributed enterprise environments where reliable routing, firewall security, and encrypted communications are required. IT administrators and system integrators implement this router to support secure site-to-site connectivity, centralized network management, and scalable branch network deployments.

Technical Specifications:

• Manufacturer Part Number (MPN): ISR4321-VSEC/K9
• Brand: Cisco
• Product Type: Integrated Services Router
• Series: Cisco ISR 4000 Series
• WAN Interfaces: 2 × Integrated Gigabit Ethernet WAN ports
• LAN Interfaces: 2 × Gigabit Ethernet ports
• Throughput: Up to 100 Mbps default throughput (upgradeable with performance licenses)
• Security Features: Integrated VPN, IPSec, firewall, and encryption acceleration
• Memory: 4 GB DRAM (expandable)
• Flash Storage: 4 GB internal flash
• Expansion Slots: 2 × NIM (Network Interface Module) slots
• USB Ports: 1 × USB 2.0 port
• Management Interfaces: Console port and auxiliary port
• Power Supply: Internal AC power supply
• Form Factor: Rack-mountable enterprise router
• Deployment Type: Branch office and enterprise edge networking

Common Replacements:

• Cisco ISR4331/K9 Integrated Services Router
• Cisco ISR4351/K9 Integrated Services Router
• Cisco C1111-8P Integrated Services Router