Which process is responsible for controlling all interfaces on a Junos device?
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The process responsible for controlling all interfaces on a Junos device is chassisd, which stands for chassis manager.
Chassisd is a critical process in Junos operating system that runs on the Routing Engine (RE) and is responsible for managing the hardware components of the router, including interfaces, Power over Ethernet (PoE), fans, and power supplies.
Chassisd works in conjunction with the Packet Forwarding Engine (PFE), which is responsible for forwarding packets received on the interfaces. When chassisd detects a change in the interface status, it communicates with the PFE to bring the interface up or down as necessary.
The chassisd process also monitors the status of the Routing Engine and the PFE, and if a fault is detected, it takes corrective action, which can include restarting the process, resetting the hardware components, or switching over to a backup Routing Engine.
In summary, chassisd is the process that controls all interfaces on a Junos device, ensuring that they are properly configured, managed, and maintained.