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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

  • ProtocolsIPv4, IPv6, static routes, Routing Information Protocol Vers
  • Speed10/100/1000Mbps
  • SecurityUL 60950-1 CAN/CSA C22.2 No. 60950-1 EN 60950-1 AS/NZS 60950
  • LAN Ports3 x 10/100/1000Mbps
  • Throughput100 Mbps to 300 Mbps
  • 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.

Highlights

  • 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

Specifications

BrandCisco Small Business
ModelISR4331-VSEC/K9
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
Speed10/100/1000Mbps
SecurityUL 60950-1
CAN/CSA C22.2 No. 60950-1
EN 60950-1
AS/NZS 60950-1
IEC 60950-1
GB-4943
LAN Ports3 x 10/100/1000Mbps
Throughput100 Mbps to 300 Mbps
Console Port1 GE (Integrated Out of Band)
TemperatureOperating Conditions:
32 to 104ºF (0 to 40ºC) (altitude 0-10000 ft) (altitude 0-3000m)
32 to 95ºF (0 to 35ºC) (altitude 10000-15000ft) (altitude 3000m-4600m)
Nonoperating Conditions: -13 to 158ºF (-25 to 70ºC)
HumidityOperating 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%
FeaturesVoice with Security (VSEC) Feature: Voice + Security
Voice (V): IP Base + Unified Communications: CME, SRST, CUBE
Security (SEC): IP Base + Advanced Security: Zone Based Firewall, IPSec VPN, EZVPN, DMVPN, FlexVPN
Dimensions17.25" x 17.25" x 1.75"
Weight14.6 lb (6.6 kg) Typical weight (fully loaded with modules)
Package ContentsISR 4331 with 3 onboard GE, 2 NIM slots, 1 ISC slot, 1 SM slots, 4 GB Flash Memory default, 4 GB DRAM default
Shipping weight7.26 kg
Package size578 × 572 × 181 mm

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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