Cisco ISR4321 ISR4321 Gigabit Router ISR4321/K9 No Clock BUG Issue

Description:

The Cisco ISR4321/K9 Integrated Services Router is a Gigabit enterprise router used in Cisco ISR 4000 Series networking systems to deliver secure WAN connectivity, advanced routing, and integrated network services for branch office infrastructures. It provides multiple Gigabit Ethernet interfaces and supports modular expansion for security, voice, and application services within Cisco enterprise network environments. Commonly installed in corporate branch offices, distributed enterprise networks, and WAN edge infrastructures, this router enables reliable data routing and secure communication between remote sites and central networks. Network administrators, IT infrastructure teams, and system integrators use this router for new network deployments, replacing legacy routing hardware, or expanding branch office connectivity within Cisco-based enterprise networks.

Applications:

The Cisco ISR4321/K9 router is used in enterprise branch networks to provide secure WAN connectivity, advanced routing services, and integrated network management. It is commonly deployed in branch offices, remote enterprise sites, and distributed corporate infrastructures where reliable routing, secure VPN connectivity, and scalable network services are required. Organizations install this router to support secure communication between headquarters and branch locations while maintaining efficient network traffic management.

Technical Specifications:

• Brand: Cisco
• Manufacturer Part Number (MPN): ISR4321/K9
• Alternate Part Number: ISR4321K9
• Product Type: Integrated Services Router
• Series: Cisco ISR 4000 Series
• WAN Interfaces: 2 × Gigabit Ethernet WAN ports
• LAN Interfaces: 2 × Gigabit Ethernet ports
• Performance Throughput: Up to 50 Mbps base performance (upgradable with license)
• Expansion Slots: 2 × Network Interface Module (NIM) slots
• USB Ports: 2 × USB 3.0 ports
• Console Ports: RJ-45 and Mini-USB console ports
• Security Features: Integrated VPN, firewall, and advanced security services
• VPN Support: IPsec VPN, SSL VPN
• Management Interface: CLI, SNMP, Cisco Configuration Professional
• Form Factor: Rack-mountable chassis
• Power Supply: External AC power adapter

Common Replacements:

• Cisco ISR4331/K9
• Cisco ISR4351/K9
• Cisco C1111-8P