Symptom

Nexus 3048 device reloads continuously with flashing blue LED. Console will not show any output

Conditions

This issue only affects N3K-C3048TP-1GE with power sequencer firmware earlier than version 5.5 on reload, power cycle, upgrade For a device that is running NX-OS Software Release 7.0(3)I7(5) or later, use the command in the following example and check the firmware version of the power sequencer in the output: switch# show install all impact nxos bootflash:n3000-compact.9.3.10.bin ----------SNIP------- Images will be upgraded according to following table: Module Image Running-Version(pri:alt) New-Version Upg-Required ------ ---------- ---------------------------------------- -------------------- ------------ 1 nxos 9.3(10) 9.3(10) no 1 bios v5.0.0(06/06/2018) v5.0.0(06/06/2018) no 1 power-seq 4.4 5.5 yes If the output of Running-Version for power-seq is earlier than version 5.5, the device may be affected by the issue described in this field notice and the power sequencer needs to be upgraded.

Workaround

In order to mitigate this issue, it is needed to upgrade the power sequencer to 5.5. Option 1: For switches running on 7.x code earlier than 7.0(3)I7(5), upgrade the Power Sequencer using a binary script before any nxos upgrade or reload using the following procedure NOTE : This procedure is only for Nexus 3048. Please dont use this procedure for any other Products. Download n3048_pwr_seq_v55_i7.bin from below location https://software.cisco.com/download/home/283970187/type/286280105/release/7.0(3)I7(4) 1. Copy the binary to the bootflash of the switch. 2. Enable the bash shell feature and run bash switch# configure terminal switch(config)# feature bash-shell switch(config)# end switch# run bash sudo su root@switch# 3. Change your current directory to /tmp/ and copy the power sequencer upgrade script from the bootflash to /tmp/ root@switch#cd /tmp root@switch#cp /bootflash/n3048_pwr_seq_v55_i7.bin . root@switch# 4. Change the file permissions of the power sequencer upgrade script so that it can be executed root@switch#chmod +x n3048_pwr_seq_v55_i7.bin root@switch# 5. Execute the power sequence upgrade script root@switch#./n3048_pwr_seq_v55_i7.bin Update Seq A Update Seq B Power sequencer firmware updated Option 2: Upgrade to a fixed Cisco NXOS Software release 7.0(3)I7(5) and later. The power sequencer upgrade capability and packaged the power sequencer firmware have been enabled on 7.0(3)I7(5) and later code. For devices running older code, please upgrade the code to 7.0(3)I7(5) or later to enable power sequencer capability. Please note that reload due to upgrade may also result in the same issue so please use option 1 before the upgrade Once the device is on 7.0(3)I7(5) and later, perform another install of the same or any later fixed NX-OS image (Example: install all nxos bootflash:nxos.7.0.3.I7.5.bin). This should upgrade the power sequencer firmware.

Further Problem Description