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Silver rack-mount router, 1U high, three LAN ports visible

Cisco Systems, Inc.

Cisco Systems, Inc. ISR4331/K9 4GB DRAM 4GB Flash firewall appliance

SKU CH-Y556-R5VPV MPN ISR4331/K9

A compact router with three Gigabit LAN ports, 4 GB DRAM and 4 GB flash, delivering 100 to 300 Mbps throughput for branch-office WAN connectivity

  • Rated speed10/100/1000 Mbit/s
  • Supported protocolsIPv4, IPv6, static routes, Routing Information Protocol Vers
  • Security featuresUL 60950-1 CAN/CSA C22.2 No. 60950-1 EN 60950-1 AS/NZS 60950
  • Network ports3 × 10/100/1000 Mbit/s
  • Data throughput100 Mbit/s to 300 Mbit/s
  • Console port1 GE (Integrated Out of Band)
  • Gigabit LAN ports connect wired devices at 10/100/1000Mbps
  • Integrated out-of-band console gives direct management access
  • 4 GB DRAM and 4 GB flash support routing and security services
  • Throughput scales from 100 Mbps to 300 Mbps for branch workloads
  • Safety certified to UL 60950-1, CAN/CSA C22.2 No. 60950-1, EN 60950-1, IEC 60950-1, AS/NZS 60950-1, GB-4943

Branch router for lean IT sites

The Cisco ISR4331/K9 is a compact integrated services router built for distributed enterprise branches with limited on-site expertise. It delivers application-aware networking across MPLS VPNs and internet links while consolidating routing, security and WAN functions in a single 1U appliance.

Silent solid-state thermal design

With no moving parts the unit operates silently within 0 to 40 °C at altitudes up to 3000 m and up to 35 °C at 4600 m. Non-operating tolerance spans -25 to 70 °C. Relative humidity is rated 5 to 85 % in service and 5 to 95 % in storage, meeting UL 60950-1 and related international safety standards.

Steps up from basic broadband gateways

The platform replaces entry-level edge boxes that lack modular WAN expansion or advanced routing protocols such as BGP, OSPF and EIGRP. It is not suited for sites requiring higher aggregate throughput beyond 300 Mbps or density beyond two NIM slots, one SM slot and one ISC slot.

How it compares

Measured against everything we stock in Firewall Appliances & VPN Gateways, at today’s prices. Recalculated every night.

Price $1,720.99
Pricier than about 71% of the 669 comparable items (median $806.99).

Specifications

Product
Brand nameCisco Small Business
Model nameISR4331/K9
Performance
Rated speed10/100/1000 Mbit/s
Data throughput100 Mbit/s to 300 Mbit/s
Connectivity
Supported protocolsIPv4, IPv6, static routes, Routing Information Protocol Versions 1 and 2 (RIP and RIPv2), Open Shortest Path First (OSPF), Enhanced IGRP (EIGRP), Border Gateway Protocol (BGP), BGP Router Reflector, Intermediate System-to-Intermediate System (IS-IS), Multicast Internet Group Management Protocol Version 3 (IGMPv3), Protocol Independent Multicast sparse mode (PIM SM), PIM Source Specific Multicast (SSM), RSVP, CDP, ERSPAN, IPSLA, CNS, Call Home, EEM, IKE, ACL, EVC, DHCP, FR, DNS, LISP, OTV, HSRP, RADIUS, AAA, AVC, Distance Vector Multicast Routing Protocol (DVMRP), IPv4-to-IPv6 Multica
Ports & slots
Network ports3 × 10/100/1000 Mbit/s
Console port1 GE (Integrated Out of Band)
Size & build
Product dimensions17.25 in × 17.25 in × 1.75 in
Product weight14.6 lb (6.6 kg) Typical weight (fully loaded with modules)
Shipping weight9.07 kg
Package size578 × 572 × 181 mm
In the box
In the boxISR 4331 with 3 onboard GE, 2 NIM slots, 1 ISC slot, 1 SM slots, 4 GB Flash Memory default, 4 GB DRAM default
Environment & compliance
Humidity rangeOperating Conditions:
Relative humidity: 5% to 85%
Short-term humidity: 5% to 90%, not to exceed 0.024 kg water/kg of dry air
Nonoperating Conditions:
Relative humidity: 5% to 95%
More details
Security featuresUL 60950-1
CAN/CSA C22.2 No. 60950-1
EN 60950-1
AS/NZS 60950-1
IEC 60950-1 GB-4943

Questions about this item

How do I mount the ISR4331/K9 in a rack and what step is often missed?

Secure the 17.25-inch wide chassis with the supplied brackets; the step often missed is verifying front-to-rear airflow clearance so the 0 to 40°C operating range is maintained.

Which components will need replacement during the life of the ISR4331/K9?

The internal fan assembly and the 4 GB DRAM or 4 GB flash modules are the field-replaceable parts that typically require swap-out after extended operation.

What throughput ceiling appears first under sustained load on the ISR4331/K9?

The 100 Mbps to 300 Mbps throughput rating is the first limit reached during continuous traffic, well before the 32 to 104°F thermal envelope is exceeded.

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