Product Overview

The SRX300 line of firewalls combines securitySD-WANroutingswitching, and WAN interfaces with next-generation firewall and advanced threat mitigation capabilities for cost-effective, secure connectivity across distributed enterprise locations. By consolidating fast, highly available switching, routing, security, and next-generation firewall capabilities in a single device, enterprises can remove network complexity, protect and prioritize their resources, and improve user and application experience while lowering total cost of ownership (TCO).


SRX300 front with top low view

Product Description

Juniper Networks® SRX300 line of firewalls delivers a next-generation secure SD-WAN and security solution that supports the changing needs of cloud-enabled enterprise networks. Whether rolling out new services and applications across locations, connecting to the cloud, or trying to achieve operational efficiency, the SRX300 line helps organizations realize their business objectives while providing scalable, easy to manage, secure connectivity and advanced threat mitigation capabilities. Next-generation firewall and unified threat management (UTM) capabilities also make it easier to detect and proactively mitigate threats to improve the user and application experience.

The SRX300 line consists of five models:

  • SRX300: Securing small branch or retail offices, the SRX300 Firewall consolidates security, routing, switching, and WAN connectivity in a small desktop device. The SRX300 supports up to 1.9 Gbps firewall and 336 Mbps IPsec VPN in a single, cost-effective networking and security platform.
  • SRX320: Securely connecting small distributed enterprise branch offices, the SRX320 Firewall consolidates security, routing, switching, and WAN connectivity in a small desktop device. The SRX320 supports up to 1.9 Gbps firewall and 336 Mbps IPsec VPN in a single, consolidated, cost-effective networking and security platform.
  • SRX340: Securely connecting midsize distributed enterprise branch offices, the SRX340 Firewall consolidates security, routing, switching, and WAN connectivity in a 1 U form factor. The SRX340 supports up to 4.7 Gbps firewall and 733 Mbps IPsec VPN in a single, cost-effective networking and security platform.
  • SRX345: Best suited for midsize to large distributed enterprise branch offices, the SRX345 Firewall consolidates security, routing, switching, and WAN connectivity in a 1 U form factor. The SRX345 supports up to 5 Gbps firewall and 977 Mbps IPsec VPN in a single, consolidated, cost-effective networking and security platform.
  • SRX380: A high-performance and secure SD-WAN gateway, the SRX380 offers superior and reliable WAN connectivity while consolidating security, routing, and switching for distributed enterprise offices. The SRX380 features greater port density than other SRX300 models, with 16x1GbE PoE+ and 4x10GbE ports, and includes redundant dual power supplies, all in a 1 U form factor. The SRX380 supports up to 20Gbps firewall and 4.4 Gbps IPSec VPN in a single, consolidated, cost-effective networking and security platform.


SRX300 Highlights

The SRX300 line of firewalls consists of secure SD-WAN routers that bring high performance and proven deployment capabilities to enterprises that need to build a worldwide network of thousands of remote sites. WAN or Internet connectivity and Wi-Fi module options include:

  • Ethernet, T1/E1, ADSL2/2+, and VDSL
  • 3G/4G LTE wireless
  • 802.11ac Wave 2 Wi-Fi


Mist AI

WAN Assurance

Mist WAN Assurance is a cloud service that brings AI-powered automation and service levels to Juniper SRX Series Firewalls, complementing the Juniper Secure SD-WAN solution. Mist WAN Assurance transforms IT operations from reactive troubleshooting to proactive remediation, turning insights into actions and delivering operational simplicity with seamless integration into existing deployments.

  • SRX Series firewalls, deployed as secure SD-WAN edge devices, deliver the rich Junos streaming telemetry that provides the insights needed for WAN health metrics and anomaly detection. This data is leveraged within the Mist Cloud and AI engine, driving simpler operations, reducing mean time to repair (MTTR) and providing greater visibility into end-user experiences.
  • Insights derived from SRX Series SD-WAN gateway telemetry data allows WAN Assurance to compute unique “User Minutes” that indicate whether users are having a good experience.
  • The Marvis assistant for WAN allows you to ask direct questions like “Why is my Zoom call bad?” and provides complete insights, correlation, and actions.
  • Marvis Actions identifies and summarizes issues such as application latency conditions, congested WAN circuits, or negotiation mismatches.


Simplifying Branch Deployments (Secure Connectivity/SD-WAN)

The SRX300 line delivers fully automated SD-WAN to both enterprises and service providers.

  • A Zero-Touch Provisioning (ZTP) feature simplifies branch network connectivity for initial deployment and ongoing management.
  • SRX300 firewalls offer best-in-class secure connectivity.
  • The SRX300 firewalls efficiently utilize multiple links and load balance traffic across the enterprise WAN, blending traditional MPLS with other connectivity options such as broadband internet, leased lines, 4G/LTE, and more.
  • Policy- and application-based forwarding capabilities enforce business rules created by the enterprise to steer application traffic towards a preferred path.


Comprehensive Security Suite

The SRX300 line offers a comprehensive suite of application security services, threat defenses, and intelligence services. The services consist of intrusion prevention system (IPS), application security user role-based firewall controls and cloud-based antivirus, anti-spam, and enhanced Web filtering, protecting networks from the latest content-borne threats. Integrated threat intelligence via Juniper Networks SecIntel offers adaptive threat protection against Command and Control (C&C)-related botnets and policy enforcement based on GeoIP. Customers can also leverage their own custom and third-party feeds for protection from advanced malware and other threats. Integrating the Juniper Networks Advanced Threat Protection solution, the SRX300 line detects and enforces automated protection against known malware and zero-day threats with a very high degree of accuracy.


Industry-Certified Junos Operating System

SRX300 Firewalls run the Junos operating system, a proven, carrier-hardened OS that powers the top 100 service provider networks in the world.

The rigorously tested, carrier-class, rich routing features such as IPv4/IPv6, OSPF, BGP, and multicast have been proven over 15 years of worldwide deployments.

The SRX300 line also enables agile SecOps through automation capabilities that support Zero Touch Deployment, Python scripts for orchestration, and event scripting for operational management.


Features and Benefits

Business Requirement Feature/Solution SRX300 Advantages
High performance Up to 20 Gbps of routing and firewall performance
  • Best suited for small, medium and large branch office deployments
  • Addresses future needs for scale and feature capacity
Business continuity Stateful high availability (HA), IP monitoring
  • Uses stateful HA to synchronize configuration and firewall sessions
  • Supports multiple WAN interface with dial-on-demand backup
  • Route/link failover based on real-time link performance
SD-WAN Better end-user application and cloud experience and lower operational costs
  • ZTP simplifies remote device provisioning
  • Advanced Policy-Based Routing (APBR) orchestrates business intent policies across the enterprise WAN
  • Application quality of experience (AppQoE) measures application SLAs and improves end-user experience
  • Controls and prioritizes traffic based on application and user role
End-user experience WAN assurance
  • Complements the Juniper Secure SD-WAN solution with AI-powered automation and service levels
  • Provides visibility and insights into users, applications, WAN links, control and data plane, and CPU for proactive remediation
Highly secure IPsec VPN, Remote Access/SSL VPN, Media Access Control Security (MACsec)
  • Creates secure, reliable, and fast overlay link over public internet
  • Employs anti-counterfeit features to protect from unauthorized hardware spares
  • Includes high-performance CPU with built-in hardware to assist IPsec acceleration
  • Provides TPM-based protection of device secrets such as passwords and certificates
  • Offers secure and flexible remote access SSL VPN with Juniper Secure Connect
Threat protection IPS, antivirus, anti-spam, enhanced web filtering, Juniper Advanced Threat Prevention Cloud, Encrypted Traffic Insights, and Threat Intelligence Feeds
  • Provides real-time updates to IPS signatures and protects against exploits
  • Protects from zero-day attacks
  • Implements industry-leading antivirus and URL filtering
  • Integrates open threat intelligence platform with third-party feeds
  • Restores visibility that was lost due to encryption without the heavy burden of full TLS/SSL decryption
Application visibility On-box GUI, Security Director
  • Detects 4,275 Layer 3-7 applications, including Web 2.0
  • Inspects and detects applications inside the SSL encrypted traffic
Easy to manage and scale On-box GUI, Security Director
  • Includes centralized management for auto-provisioning, firewall policy management, Network Address Translation (NAT), and IPsec VPN deployments, or simple, easy-to-use on-box GUI for local management
Minimize TCO Junos OS
  • Integrates routing, switching, and security in a single device
  • Reduces operation expense with Junos automation capabilities


SRX300, SRX320, SRX340, SRX345, SRX380 Image

SRX300 Specifications

Software Specifications

Routing Protocols

  • IPv4, IPv6, ISO, Connectionless Network Service (CLNS)
  • Static routes
  • RIP v1/v2
  • OSPF/OSPF v3
  • BGP with Route Reflector
  • IS-IS
  • Multicast: Internet Group Management Protocol (IGMP) v1/v2, Protocol Independent Multicast (PIM) sparse mode (SM)/dense mode (DM)/source-specific multicast (SSM), Session Description Protocol (SDP), Distance Vector Multicast Routing Protocol (DVMRP), Multicast Source Discovery Protocol (MSDP), Reverse Path Forwarding (RPF)
  • Encapsulation: VLAN, Point-to-Point Protocol (PPP), Frame Relay, High-Level Data Link Control (HDLC), serial, Multilink Point-to-Point Protocol (MLPPP), Multilink Frame Relay (MLFR), and Point-to-Point Protocol over Ethernet (PPPoE)
  • Virtual routers
  • Policy-based routing, source-based routing
  • Equal-cost multipath (ECMP)


QoS Features

  • Support for 802.1p, DiffServ code point (DSCP), EXP
  • Classification based on VLAN, data-link connection identifier (DLCI), interface, bundles, or multifield filters
  • Marking, policing, and shaping
  • Classification and scheduling
  • Weighted random early detection (WRED)
  • Guaranteed and maximum bandwidth
  • Ingress traffic policing
  • Virtual channels
  • Hierarchical shaping and policing


Switching Features

  • ASIC-based Layer 2 Forwarding
  • MAC address learning
  • VLAN addressing and integrated routing and bridging (IRB) support
  • Link aggregation and LACP
  • MVRP
  • 802.1X authentication


Firewall Services

  • Stateful and stateless firewall
  • Zone-based firewall
  • Screens and distributed denial of service (DDoS) protection
  • Protection from protocol and traffic anomaly
  • Integration with Pulse Unified Access Control (UAC)
  • Integration with Aruba Clear Pass Policy Manager
  • User role-based firewall
  • SSL Inspection (Forward-proxy)


Network Address Translation (NAT)

  • Source NAT with Port Address Translation (PAT)
  • Bidirectional 1:1 static NAT
  • Destination NAT with PAT
  • Persistent NAT
  • IPv6 address translation


VPN Features

  • Tunnels: Site-to-Site, Hub and Spoke, Dynamic Endpoint, AutoVPN, ADVPN, Group VPN (IPv4/ IPv6/ Dual Stack)
  • Juniper Secure Connect: Remote access / SSL VPN
  • Configuration payload: Yes
  • IKE Encryption algorithms: Prime, DES-CBC, 3DES-CBC, AEC-CBC, AES-GCM, SuiteB
  • IKE authentication algorithms: MD5, SHA-1, SHA-128, SHA-256, SHA-384
  • Authentication: Pre-shared key and public key infrastructure (PKI) (X.509)
  • IPsec (Internet Protocol Security): Authentication Header (AH) / Encapsulating Security Payload (ESP) protocol
  • IPsec Authentication Algorithms: hmac-md5, hmac-sha-196, hmac-sha-256
  • IPsec Encryption Algorithms: Prime, DES-CBC, 3DES-CBC, AEC-CBC, AES-GCM, SuiteB
  • Perfect forward secrecy, anti-reply
  • Internet Key Exchange: IKEv1, IKEv2
  • Monitoring: Standard-based dead peer detection (DPD) support, VPN monitoring
  • VPNs GRE, IP-in-IP, and MPLS


Network Services

  • Dynamic Host Configuration Protocol (DHCP) client/server/relay
  • Domain Name System (DNS) proxy, dynamic DNS (DDNS)
  • Juniper real-time performance monitoring (RPM) and IP-monitoring
  • Juniper flow monitoring (J-Flow)1
  • Bidirectional Forwarding Detection (BFD)
  • Two-Way Active Measurement Protocol (TWAMP)
  • IEEE 802.3ah Link Fault Management (LFM)
  • IEEE 802.1ag Connectivity Fault Management (CFM)


High Availability Features

  • Virtual Router Redundancy Protocol (VRRP)
  • Stateful high availability
  • Dual box clustering
  • Active/passive
  • Active/active
  • Configuration synchronization
  • Firewall session synchronization
  • Device/link detection
  • In-Band Cluster Upgrade (ICU)
  • Dial on-demand backup interfaces
  • IP monitoring with route and interface failover


Management, Automation, Logging, and Reporting

  • SSH, Telnet, SNMP
  • Smart image download
  • Juniper CLI and Web UI
  • Mist AI
    • Simplified management
    • WAN Assurance
  • Junos Space and Security Director
  • Python
  • Junos OS event, commit, and OP script
  • Application and bandwidth usage reporting
  • Auto installation
  • Debug and troubleshooting tools
  • Zero-Touch Provisioning with Contrail Service Orchestration

Advanced Routing Services

  • Packet mode
  • Circuit cross-connect (CCC), translational cross-connect (TCC)
  • L2/L3 MPLS VPN, pseudowires
  • Virtual private LAN service (VPLS), next-generation multicast VPN (NG-MVPN)
  • MPLS traffic engineering and MPLS fast reroute


Application Security Services1

  • Application visibility and control
  • Application-based firewall
  • Application QoS
  • Application-based advanced policy-based routing
  • Application quality of experience (AppQoE)


Enhanced SD-WAN Services

  • Application-based advanced policy-based routing (APBR)
  • Application-based link monitoring and switchover with Application quality of experience (AppQoE)


Threat Defense and Intelligence Services1

  • Intrusion prevention
  • Antivirus
  • Antispam
  • Category/reputation-based URL filtering
  • Protection from botnets (command and control)
  • Adaptive enforcement based on GeoIP
  • Juniper Advanced Threat Prevention to detect and block zero-day attacks
  • Adaptive Threat Profiling
  • Encrypted Traffic Insights
  • SecIntel to provide threat intelligence


1Offered as advanced security services subscription licenses.


Hardware Specifications

2SRX320 with PoE+ ports available as a separate SKU: SRX320-POE.
3SRX345 with dual AC PSU model.
4SRX320 non PoE model.
5SRX320-POE with 6 ports PoE+ model.
6SRX345 with DC power supply (operating temperature as per GR-63 Issue 4 2012 test criteria).
7As per GR63 Issue 4 (2012) test criteria.
Specification SRX300 SRX320 SRX340 SRX345 SRX380
Total onboard ports 8x1GbE 8x1GbE 16x1GbE 16x1GbE 20 (16x1GbE, 4x10GbE)
Onboard RJ-45 ports 6x1GbE 6x1GbE 8x1GbE 8x1GbE 16x1GbE
Onboard small form-factor pluggable (SFP) transceiver ports 2x1GbE 2x1GbE 8x1GbE 8x1GbE 4x10GbE SFP+
MACsec-capable ports 2x1GbE 2x1GbE 16x1GbE 16x1GbE 16x1GbE


Out-of-band (OOB) management ports 0 0 1x1GbE 1x1GbE 1x1GbE
Mini PIM (WAN) slots 0 2 4 4 4
Console (RJ-45 + miniUSB) 1 1 1 1 1
USB 3.0 ports (type A) 1 1 1 1 1
PoE+ ports N/A 62 0 0 16
Memory and Storage
System memory (RAM) 4 GB 4 GB 4 GB 4 GB 4GB
Storage 8 GB 8 GB 8 GB 8 GB 100GB SSD
SSD slots 0 0 1 1 1
Dimensions and Power
Form factor Desktop Desktop 1 U 1 U 1U
Size (WxHxD) 12.63 x 1.37 x 7.52 in.
(32.08 x 3.47 x 19.10 cm)
11.81 x 1.73 x 7.52 in.
(29.99 x 4.39 x 19.10 cm)
17.36 x 1.72 x 14.57 in.
(44.09 x 4.36 x 37.01 cm)
17.36 x 1.72 x 14.57 in. (44.09 x 4.36 x 37.01 cm) / 17.36 x 1.72 x 18.7 in. (44.09 x 4.36 x 47.5 cm)3 17.36 x 1.72 x 18.7 in. (44.09 x 4.37 x 47.5 cm) / 17.36 x 1.72 x 20.47 in. (44.09 x 4.37 x 52 cm)
Weight (device and PSU) 4.38 lb (1.98 kg) 3.28 lb (1.51 kg)4 / 3.4 lb (1.55 kb)5 10.80 lb (4.90 kg) 10.80 lb (4.90 kg) /
11.02 lb (5 kg)6
15 lb (6.8 kg) with 1xPSU / 16.76 lb (7.6 kg) with 2xPSU
Redundant PSU No No No No Yes
Power supply AC (external) AC (external) AC (internal) AC (internal) / DC (internal)6 1+1 hot-swappable AC PSU
Rated DC voltage range N/A N/A N/A -48 to -60 VDC (with -15% and +20% tolerance) NA
Rated DC operating voltage range N/A N/A N/A -40.8 VDC to -72 VDC6 N/A
Maximum PoE power N/A 180 W5 N/A N/A 480W
Average power consumption 24.9 W 46 W4/221 W5 122 W 122 W 150 W (without PoE)

510 W (with PoE)

Average heat dissipation 85 BTU/h 157 BTU/h4/755 BTU/h5 420 BTU/h 420 BTU/h 511.5 BTU/hr (without PoE)
Maximum current consumption 0.346 A 0.634 A4/2.755 A5 1.496 A 1.496 A / 6A @ -48 VDC6 1.79A/7.32A
Acoustic noise level 0dB (fanless) 37 dBA4/40 dBA5 45.5 dBA 45.5 dBA < 50dBA @ room temperature 27C
Airflow/cooling Fanless Front to back Front to back Front to back Front to back
Environmental, Compliance, and Safety Certification
Operational temperature -4° to 140° F
(-20° to 60° C)7
32° to 104° F (0° to 40° C) 32° to 104° F (0° to 40° C) 32° to 104° F (0° to 40° C)

-22° to 131° F (-30° to 55° C) for SRX345-DC

32° to 104° F (0° to 40° C)
with MPIMs32° to 122° F (0° to 50° C) without MPIMs
Nonoperational temperature -4° to 158° F (-20° to 70° C) -4° to 158° F (-20° to 70° C) -4° to 158° F (-20° to 70° C) -4° to 158° F (-20° to 70° C)

-22° to 158° F (-30° to 70° C) for SRX345-DC

-4° to 158° F (-20° to 70° C)
Operating humidity 10% to 90% noncondensing 10% to 90% noncondensing 10% to 90% noncondensing 10% to 90% noncondensing 10% to 90% noncondensing
Nonoperating humidity 5% to 95% noncondensing 5% to 95% noncondensing 5% to 95% noncondensing 5% to 95% noncondensing 5% to 95% noncondensing
Meantime between failures (MTBF) 44.5 years 32.5 years4/ 26 years5 27 years 27.4 years 28.1 years
FCC classification Class A Class A Class A Class A Class A
RoHS compliance RoHS 2 RoHS 2 RoHS 2 RoHS 2 RoHS 2
FIPS 140-2 Level 2 (Junos 15.1X49-D60) Level 1 (Junos 15.1X49-D60) Level 2 (Junos 15.1X49-D60) Level 2 (Junos 15.1X49-D60) N/A
Common Criteria certification NDPP, VPNEP, FWEP, IPSEP (based on Junos 15.1X49-D60) NDPP, VPNEP, FWEP, IPSEP (based on Junos 15.1X49-D60) NDPP, VPNEP, FWEP, IPSEP (based on Junos 15.1X49-D60) NDPP, VPNEP, FWEP, IPSEP (based on Junos 15.1X49-D60) N/A


Performance and Scale

8Throughput numbers based on UDP packets and RFC2544 test methodology.
9Throughput numbers based on HTTP traffic with 44 KB transaction size.
10Route scaling numbers are with enhanced route-scale features turned on.
11Next-Generation firewall performance is measured with Firewall, Application Security and IPS enabled using 64KB transactions
12Secure Web Access firewall performance is measured with Firewall, Application Security, IPS, SecIntel, and URL Filtering enabled using 64KB transactions