J4300 - Router Juniper - Free user manual and instructions
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| Product Type | Router |
| Brand | Juniper |
| Model | J4300 |
| Dimensions (W x D x H) | 17.5 x 14 x 3.5 in (44.5 x 35.6 x 8.9 cm) |
| Weight | 20 lb (9.1 kg) |
| Power Supply | AC 100-240 V, 50-60 Hz, 150 W typical |
| Redundant Power | Dual internal power supplies (optional) |
| Interfaces | 4 x Gigabit Ethernet, 2 x serial console, modular slots for additional interfaces |
| Routing Protocols | OSPF, BGP, IS-IS, RIP, static routing |
| Security Features | Integrated firewall, IPsec VPN, NAT, ACLs |
| Quality of Service | Traffic shaping, policing, priority queuing |
| Management | CLI (SSH, Telnet), Junos OS, SNMP, web GUI (J-Web) |
| Cooling | Internal fans with airflow from front to back |
| Operating Temperature | 32°F to 104°F (0°C to 40°C) |
| Humidity | 5% to 90% non-condensing |
| Safety Certifications | UL, CE, FCC Class A |
| Maintenance | Keep vents clear of dust; clean with dry cloth; avoid liquids |
| Spare Parts & Repairability | Replaceable power supplies and fan modules; contact Juniper support for other parts |
Frequently Asked Questions - J4300 Juniper
How do I perform a factory reset on the Juniper J4300?
To reset to factory defaults, press the RESET button on the front panel for at least 5 seconds while power is on. Alternatively, use the CLI command:
request system boot recovery and follow prompts.What is the default login for the J4300?
The default username is root with no password. It is strongly recommended to set a password immediately after initial login using the command
set system root-authentication plain-text-password.How can I upgrade the Junos OS on my J4300?
Download the Junos OS image from Juniper's support site. Then use the command
request system software add to install the new version. Reboot the router to apply the upgrade.Can I use the J4300 as a firewall?
Yes, the J4300 includes an integrated stateful firewall. You can configure security policies using CLI or J-Web. It also supports IPsec VPN for secure connectivity.
How do I configure VLANs on the J4300?
VLANs are configured by creating sub-interfaces under a physical interface. For example:
set interfaces ge-0/0/0 unit 0 vlan-id 100. Assign VLAN IDs and IP addresses as needed.What types of interface modules are compatible with the J4300?
The J4300 supports Juniper J-series interface modules, including Gigabit Ethernet, Fast Ethernet, serial, and T1/E1 modules. Check Juniper's compatibility list for specific module versions.
How do I enable SSH access on the J4300?
Enable SSH by configuring:
set system services ssh. Ensure that the router has a management IP and that firewall rules allow SSH traffic.What is the maximum power consumption of the J4300?
The maximum power consumption is approximately 200 W under full load. Use a power supply rated for at least 250 W to allow for redundancy and expansion.
How do I back up the router configuration?
Use the command
show configuration | save filename to save the current configuration to a file. Transfer it off-device via FTP or SCP for safe storage.What does the amber LED on the front panel indicate?
An amber LED typically indicates a warning or non-critical alarm. Common causes include a failing fan or high temperature. Use the CLI command
show chassis alarms to identify the issue.User questions about J4300 Juniper
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USER MANUAL J4300 Juniper
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Product information
Brand : Juniper
Model : J4300
Category : Router