Cisco ISR4451-X/K9: Flagship Integrated Services Router for High-End Enterprise

The Cisco ISR4451-X/K9 is the top-of-the-line Integrated Services Router (ISR) in the 4000 Series, engineered for the most demanding large branch offices, campus edge deployments, and enterprise-wide application services. This high-performance, modular router delivers unprecedented levels of throughput, scalability, and integrated services, consolidating routing, advanced security, voice, and robust application hosting onto a single, resilient platform. With its comprehensive "K9" security features, it provides highly secure, reliable, and high-bandwidth connectivity, acting as a critical nerve center for your entire Cisco Network Switch infrastructure.

Extreme Performance for Demanding Networks

The ISR 4451-X offers the highest forwarding performance in the ISR 4000 Series, capable of handling multi-gigabit traffic flows for large-scale data, voice, and video applications. This ensures seamless operation even during peak network utilization.

Maximum Modularity and Future Scalability

Equipped with the greatest number of network interface module (NIM) and enhanced service module (SM-X) slots in its series, the ISR4451-X/K9 provides unparalleled modularity. It supports extensive customization and future expansion to meet evolving business demands, integrating new technologies as they emerge.

Advanced Integrated Security (K9 Bundle)

The "/K9" security bundle delivers cutting-edge threat intelligence and defense, including powerful VPN capabilities, advanced firewall, intrusion prevention (IPS), and robust content filtering. This comprehensive security protects your enterprise network from sophisticated cyber threats and ensures data integrity.

Comprehensive Unified Communications and Application Hosting

This router supports high-density voice and video services, making it ideal for large-scale unified communications deployments. Its superior processing power also allows it to host multiple Cisco and third-party applications directly, simplifying branch IT and efficiently managing all forms of traffic, including that from numerous Cisco Wireless AP deployments.

Cisco ISR4451-X/K9 Detailed Parameters

Parameter Category	Parameter	Specification
Device Type	Model	ISR4451-X/K9
	Product Type	Integrated Services Router (ISR)
Performance	Aggregate Throughput	1 Gbps to 2 Gbps (scalable with performance license)
Modularity	NIM Slots	3
	SM-X Slots	2 (can support single or double-wide modules)
	DIMM Slots	2
	Onboard GE Ports	4 (2 RJ-45, 2 Combo RJ-45/SFP)
Memory	Default DRAM	4 GB
	Max DRAM	16 GB
	Default Flash	4 GB
	Max Flash	16 GB
Features	Security Bundle	Yes (K9 - including IPsec VPN, SSL VPN, Firewall, etc.)
	Voice/Video Support	Yes (with appropriate modules and licenses)
	Application Services	Yes (Cisco IOS XE based)
Physical Specifications	Rack Units (RU)	2 RU
	Dimensions (H x W x D)	88.9 x 438.15 x 476.25 mm (3.5 x 17.25 x 18.75 inches)
	Weight (Approximate)	14.2 kg (31.3 lbs)
Environmental	Operating Temperature	0°C to 40°C (32°F to 104°F)
	Operating Humidity	5% to 85% non-condensing
Compliance	Safety/EMC	Regulatory compliance specific to Cisco ISRs