AS7326-56X / AS7726-32X - The switch has rebooted unexpectedly Follow

Purpose : 

This article shows the step for taking care of the "rebooted unexpectedly" issue. 

Model : 

AS7326-56X / AS7726-32X

Symptom : 

The switch randomly encounters an unexpected reboot.

Procedure : 

Step-1 Please make sure the switch whether reboot by the NOS(Networking Operating system)

Usually, the Linux system will have "/var/log/dmesg" and "/var/log/messages"...etc to record the system

activity. You can check system logs or consult with NOS vendor.

If the system is not rebooted by the NOS, please process the next steps.

Step-2 Check the current BIOS version

Execute "dmidecode -t bios" to check the BIOS version.

ONIE:/ # dmidecode -t bios
# dmidecode 3.1
Getting SMBIOS data from sysfs.
SMBIOS 3.0 present.
Handle 0x0000, DMI type 0, 24 bytes
BIOS Information
        Vendor: American Megatrends Inc.
        Version: v40.01.01.00
        Release Date: 09/24/2020
        Address: 0xF0000
        Runtime Size: 64 kB
        ROM Size: 8128 kB
.
.
.
<omit>

Step-3 Upgrade the BIOS to the latest version

Since the Intel Broadwell-DE Xeon D-1518 CPU has some known issues related to the C-state function.[1]

Therefore we will recommend upgrading the BIOS to the latest version first.

AS7326-56X BIOS v36.01.00.00 and AS7726-32X BIOS v36.01.00.00 enabled the C-state by default.

Regarding the AS7326-56X, please upgrade the BIOS version to v40.01.01.01 or above version.

It will disable the CPU C-state in the BIOS setup menu by default.

Please find the latest version of BIOS from the link below to upgrade:

• DCS203(AS7326-56X)
• [BIOS]How to upgrade the BIOS via EFI shell on Edgecore x86 platform switch?

Regarding the AS7726-32X, please upgrade the BIOS version to v40.01.01.01 or above version.

It will disable the CPU C state in the BIOS setup menu by default.

Please find the latest version of BIOS from the link below to upgrade:

• DCS204(AS7726-32X)
• [BIOS]How to upgrade the BIOS via EFI shell on Edgecore x86 platform switch?

After upgrading, please check the current CPU C-state setting from the BIOS menu.

• Go to the "IntelRCSetup" section and select the "Advanced Power Management Configuration".

• Select the CPU C State Control.

• Check if CPU C-states are disabled by default.

If the above steps are unable to resolve the issue, please collect all system information and contact our Edgecore support team.

Reference:

[1] https://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/xeon-d-1500-specification-update.pdf - Errata BDE53, BDE102, BDE115.