Support Support Downloads Knowledge Base Juniper Support Portal Community

Knowledge Base

Search our Knowledge Base sites to find answers to your questions.

Ask All Knowledge Base Sites All Knowledge Base Sites JunosE Defect (KA)Knowledge BaseSecurity AdvisoriesTechnical BulletinsTechnotes Sign in to display secure content and recently viewed articles

[EX] Voltage injection causes 'status 36' error messages

0

0

Article ID: KB36689 KB Last Updated: 11 Apr 2021Version: 1.0
Summary:

Power over Ethernet (POE) stops working and voltage injection occurs. 'Status 36' messages are observed.

Platforms that apply: EX2300/‚ÄčEX3400/EX4300.

Symptoms:

Power over Ethernet (POE) stops working for all affected ports, and in some cases the POE controller fails permanently. The device raises an alarm for voltage injection and status 36 messages are observed.

To check:

show log messages | match chassisd
                  show system alarms

When an EX2300/3400/4300 series switch is connected to any device (switch, firewall etc) with POE capabilities and if POE is not turned off on the connected ports, then both of the devices start providing power to each other by inducing a voltage into each other. This is referred to as voltage injection. Once this happens, status 36 error messages are logged into the device.

chassisd[3389]: %DAEMON-3: PoE port name ge-0/0/0 status 36
chassisd[3389]: %DAEMON-3: PoE port name ge-0/0/1 status 36
chassisd[3389]: %DAEMON-3: PoE port name ge-0/0/2 status 36
chassisd[3389]: %DAEMON-3: PoE port name ge-0/0/3 status 36

In some cases, the device will also raise an alarm for voltage injection:

Oct 17 03:11:10  sw1 alarmd[3390]: %DAEMON-4: Alarm set: POE color=YELLOW, class=CHASSIS, reason=PoE voltage injection in Interface ge-0/0/0
Oct 17 03:11:10 sw1 craftd[3402]: %DAEMON-4: Receive FX craftd set alarm message: color: 2 class: 100 object: 148 slot: 0 silent: 0 short_reason=PoE voltage injecti long_reason=PoE voltage injection in Interface ge-0/0/0 id=33554580 reason=16777216
Oct 17 03:11:10  sw1 craftd[3402]: %DAEMON-4:  Minor alarm set, PoE voltage injection in Interface ge-0/0/0
Solution:

As an electrical effect, voltage injection is time-based. To prevent this issue, disable POE on all ports connected to POE capable devices before the ports are enabled. This is the only way voltage injection can be prevented. Once voltage injection occurs, the only solution is to replace the device.

To disable POE:

set Poe interface ge-0/0/0 disable

Comment on this article > Affected Products Browse the Knowledge Base for more articles related to these product categories. Select a category to begin.

Getting Up and Running with Junos

Getting Up and Running with Junos Security Alerts and Vulnerabilities Product Alerts and Software Release Notices Problem Report (PR) Search Tool EOL Notices and Bulletins JTAC User Guide Customer Care User Guide Pathfinder SRX High Availability Configurator SRX VPN Configurator Training Courses and Videos End User Licence Agreement Global Search