Cisco ISR 4431 4GE 3NIM Router | Enterprise WAN, Modular ISR — CON-OS-C1ASR1TU

Keep branch connectivity under control with a router built for modular growth. The Cisco ISR 4431 provides four Gigabit Ethernet ports, three NIM slots, 8 GB of flash, and 4 GB of DRAM, giving infrastructure teams a platform that can adapt as WAN, voice, and service requirements change. This class of ISR is valued for its balance of performance, expansion, and operational consistency. The 4431 gives you a compact enterprise routing foundation with enough memory and interface flexibility to support demanding branch environments without moving to a larger chassis too early. The three NIM slots matter when you need to add services, interfaces, or specialized connectivity as the site evolves. For procurement teams, the value is in avoiding short-lived hardware decisions. For architects, it is the ability to standardize on a router family that can serve multiple branch profiles while preserving a familiar Cisco operational model. This makes the ISR 4431 a strong fit for organizations that want a durable routing platform rather than a minimal appliance that will be outgrown quickly. Ideal For Deploy as a branch office WAN router with room for future interface expansion Standardize routing across distributed enterprise sites Support modular service add-ons through NIM-based expansion Provide a Cisco-managed routing platform for campus edge connectivity Why This Product 1 Adds 3 NIM slots for future expansion 2 Includes 8 GB flash and 4 GB DRAM for branch workloads 3 Fits enterprise WAN standardization better than fixed-function routers 4 Offers Cisco ISR modularity for evolving site requirements