Cisco ISR 4300 ISR4331/K9 Cisco ISR 4000 series router
Brand: Cisco | Category: Network Equipment
SKU: CSC-ISR4331K9 | Part #: ISR4331/K9 | MPN: ISR4331/K9
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About the Cisco ISR 4300 ISR4331/K9 Cisco ISR 4000 series router
The Cisco ISR4331/K9 router delivers enterprise-grade connectivity with 3 built-in Gigabit Ethernet ports and comprehensive modular expansion capabilities, featuring 2 NIM slots for network interface modules, 1 SM slot for service modules, and 1 ISM slot for internal service modules. This 1U rack-mountable design from Cisco combines dense interface options with flexible architecture, enabling network engineers to scale branch and campus deployments without sacrificing physical footprint.
Built on Cisco IOS XE, the ISR 4331 provides default system throughput of 100 Mbps with the ability to scale to 300 Mbps through throughput license upgrades, supporting mission-critical routing protocols including BGP, OSPF, EIGRP, IS-IS, RIP, Static routing, IPv6, and MPLS. The platform includes robust security features—Zone-Based Firewall, NAT, ACL, IOS IPS, and URL Filtering—alongside comprehensive VPN support for IPsec, DMVPN, GET VPN, FlexVPN, and SSL VPN. With 4 GB of default DRAM and 4 GB flash memory, expandable to 16 GB DRAM, plus dual USB 3.0 ports and dual console management interfaces (RJ-45 and Mini-USB), this Cisco router addresses the needs of IT procurement teams and network architects seeking reliable, standards-based routing for hybrid WAN environments.
Key Specifications
- Manufacturer Part Number: ISR4331/K9
- Product Series: Cisco ISR 4300
- Form Factor: Rack-mountable, 1U
- Operating System: Cisco IOS XE
- System Throughput: 100 Mbps default, up to 300 Mbps with throughput license upgrade
- WAN/LAN Ports: 3 x Gigabit Ethernet (RJ-45)
- Modular Slots: 2 NIM, 1 SM, 1 ISM
- Memory: 4 GB default DRAM (expandable to 16 GB); 4 GB flash memory
- VPN Support: IPsec, DMVPN, GET VPN, FlexVPN, SSL VPN
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Technical Specifications
| Brand | Cisco |
| Category | Network Equipment |
| SKU | CSC-ISR4331K9 |
| Part Number | ISR4331/K9 |
| Condition | New |
| Form Factor | 1U |
| Manufacturer Part Number | ISR4331/K9 |
| Product Series | Cisco ISR 4300 |
| Product Model | ISR 4331 |
| Form Factor | Rack-mountable, 1U |
| Operating System | Cisco IOS XE |
| Default System Throughput | 100 Mbps |
| Maximum System Throughput | 300 Mbps (with throughput license upgrade) |
| Built-in WAN/LAN Ports | 3 x Gigabit Ethernet (RJ-45) |
| NIM Slots (Network Interface Module) | 2 |
| SM Slots (Service Module) | 1 |
| ISM Slots (Internal Service Module) | 1 |
| USB Ports | 2 x USB 3.0 |
| Management Ports | 1 x RJ-45 Console, 1 x Mini-USB Console |
| Default DRAM | 4 GB |
| Default Flash Memory | 4 GB |
| Maximum DRAM | 16 GB |
| Routing Protocols | BGP, OSPF, EIGRP, IS-IS, RIP, Static, IPv6, MPLS |
| VPN Support | IPsec, DMVPN, GET VPN, FlexVPN, SSL VPN |
| Security Features | Zone-Based Firewall, NAT, ACL, IOS IPS, URL Filtering |
| Power Supply | Internal, AC |
| Power Consumption (Typical) | Approximately 40 W (system dependent on installed modules) |
| Operating Temperature | 0°C to 40°C (32°F to 104°F) |
| Dimensions (H x W x D) | 1.73 x 17.3 x 19.3 in (4.4 x 43.9 x 49.0 cm) |
Frequently Asked Questions about Cisco ISR 4300 ISR4331/K9 Cisco ISR 4000 series router
What does the Cisco ISR 4300 ISR4331/K9 Cisco ISR 4000 series router do?
The Cisco ISR 4300 ISR4331/K9 Cisco ISR 4000 series router is enterprise networking hardware for data-center, campus, and branch deployments. Common roles include core/distribution switching, server uplinks, top-of-rack fabric, and edge connectivity in mixed Cisco/Juniper/Arista environments.
Is the Cisco ISR 4300 ISR4331/K9 Cisco ISR 4000 series router compatible with my infrastructure?
The Cisco ISR 4300 ISR4331/K9 Cisco ISR 4000 series router interoperates with standard switching protocols (LACP, MLAG/VPC, 802.1Q, OSPF/BGP). For specific cross-vendor scenarios — Cisco-to-Arista MLAG peering, fabric integration with Cumulus/SONiC, or migration from legacy Catalyst — our network engineers map a compatibility plan as part of the RFQ.