In this article, we will explore how an over-temperature issue might contribute to the recurring OSPF flapping in the QFX5100
Frequent OSPF flapping on the QFX5100 device, resulting in traffic disruptions.
The OSPF neighbor states for both IPv4 and IPv6 repeatedly transitioned from "Full" to "Down" due to interface disruptions.
Logs revealed that the interface xe-0/0/45 flapped, coinciding with an abnormal system shutdown, Where all the interfaces in the device went down due to over temperature issue.
Below mentioned logs will be observed in chassid logs.
Line 20174: Nov 25 13:05:30 {chassis, shutdown-on-re-over-temperature, 0x3 0x84c83f0}
Line 20332: Nov 25 13:05:30 {chassis, overtemp-quick-shutdown, 0x3 0x84c7a50}
The over-temperature issue appears to be the root cause of both the OSPF flap and system shutdowns. Several potential factors could be contributing to this issue, including the possibility of fan tray failure, improper environmental conditions, or the device running on a single fan tray.
Check the device's environmental surroundings to ensure they meet recommended standards (e.g., temperature, airflow, humidity).
Inspect the fan trays to confirm they are functioning properly and that no fans are malfunctioning or running at reduced speeds.
Run the following command to verify the chassis temperature thresholds:
show chassis temperature-thresholds
Ensure the current temperature is within the acceptable limits.
Run the following command to check the current temperatures and ensure they are within operational ranges:
show chassis environment
Inspect all fan trays for proper operation. Ensure that the cooling systems are configured and functioning to their full capacity.
Review the temperature control best practices as outlined by Juniper to ensure that the environment around the device complies with their guidelines. You can find the best practices here: Temperature Control Best Practices Temperature Control Best Practices.