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Silver rack-mount chassis with front status LEDs and three copper Ethernet ports

Cisco Systems, Inc.

Cisco Systems, Inc. ISR4331-VSEC/K9 firewall appliance

SKU CH-ZPJG-X4ET7 MPN ISR4331-VSEC/K9

A compact router with three gigabit LAN ports, built-in voice and security licences, and 100–300 Mbps throughput for branch offices

  • 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)
  • Integrated voice and security bundle simplifies branch deployments
  • Three Gigabit LAN ports provide wired connectivity flexibility
  • 100 to 300 Mbps throughput handles typical branch traffic
  • Compact 1.75 inch height fits standard rack spaces
  • Safety certified to UL 60950-1 and international equivalents

Cisco ISR 4331 VSEC Router

The Cisco ISR 4331 is a branch-office router that combines voice and security licences in one appliance. It provides three onboard Gigabit Ethernet LAN ports and a dedicated management port. The unit includes two NIM slots, one ISC slot and one SM slot for future module expansion. Default memory ships as 4 GB flash and 4 GB DRAM.

Voice and Security Use Cases

This bundle suits sites that need IP telephony features such as CME, SRST and CUBE alongside zone-based firewall, IPsec VPN, DMVPN and FlexVPN. It is not for buyers who want more than three fixed LAN ports or higher aggregate throughput than 300 Mbps. It also does not fit environments that require PoE on the built-in interfaces.

Throughput and Licence Bundle

The security and voice licences are pre-loaded, delivering 100 to 300 Mbps throughput with the VSEC feature set enabled. This single specification determines whether the appliance matches the branch WAN capacity and service requirements.

How it compares

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

Price $4,421.99
Pricier than about 86% of the 669 comparable items (median $806.99).

Specifications

Product
Brand nameCisco Small Business
Model nameISR4331-VSEC/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 weight7.26 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 much heat does the ISR4331-VSEC/K9 add to a rack running 24/7?

The appliance operates from 32 to 104°F at sea level and up to 158°F in storage, so normal rack cooling that keeps ambient temperature within this range is sufficient.

What WAN circuits must I already have to use the three onboard GE ports?

The three 10/100/1000Mbps LAN ports connect directly to Ethernet handoffs from MPLS, broadband or fibre terminations — no additional media modules are required for those links.

Can the ISR4331-VSEC/K9 run alongside an older ISR G2 branch router in the same VPN mesh?

Yes — it supports IPsec, DMVPN, FlexVPN and EZVPN with the same protocols (IKEv1/IKEv2, AES, SHA) used on G2 platforms, so existing tunnels remain compatible.

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