Description

In some cases, customers may experience difficulties getting certain power injectors and cameras to operate as expected. These issues can affect device performance or connectivity and may require additional troubleshooting to ensure proper functionality.

Symptoms

Some Juniper devices are configured by default to operate at 1000 Mbps with auto-negotiation enabled. When a customer connects certain power injectors or cameras that do not support these settings, the Ethernet link may fail to establish, causing the port to remain down and preventing communication with the connected device.

Solution

As a workaround you can use the following commands:

root@switch# set interfaces ge-0/0/X speed 100m  

root@switch# set interfaces ge-0/0/X link-mode full-duplex

root@switch# set interfaces ge-0/0/X ether-options no-auto-negotiation  

 

** Do not forget to check if POE is enabled on the port. ** 

 

You will see the port coming up with the configuration changes reflected, as per the following example:

root@switch# run show interfaces | find ge-0/0/x

Physical interface: ge-0/0/x, Enabled, Physical link is Up

Interface index: 137, SNMP ifIndex: 518

Description: Camera

Link-level type: Ethernet, MTU: 1514, Speed: 100mbps, Duplex: Full-Duplex, BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Enabled,

Auto-negotiation: Disabled, Remote fault: Online, Media type: Copper

Modification History

10/10/2023 : Article Created