Symptom
After a reload of N9K-C93108TC-FX3P/ 93108TC-FX3H, some RJ45 interfaces might not come up even when connected.
This issue is triggered when the leaf reloads for any reason (power up/down, upgrade, software reset, crash).
The problem is related only to the front-panel interfaces Ethernet 1/1 - 1/48. Optical ports and MGMT port is not affected.
Conditions
++ Multiple interfaces fail to come up post reload.
++ The issue is seen on multiple PHYs.
++ Nexus 93108TC-FX3P / 93108TC-FX3H in Nexus/ACI mode
How to verify impacted ports.
If. i) MI FPGA versions must be lower than 17. =---> fix present in 17.
leaf# vsh -c "show version module 1 epld" | grep "MI FPGA"
MI FPGA 0.016
ii) verify if all the register values match for below 7 registers for impacted port.
####Don't even try debug command for any platform other than N9K-93108TC-FX3P / N9K-93108TC-FX3H###
node101# vsh_lc
Module-1# deb platform internal usd aquantia op 1 port 10 reg-val 0x70000 data 0
Module-1# deb platform internal usd aquantia op 1 port 10 reg-val 0x70001 data 0
Module-1# deb platform internal usd aquantia op 1 port 10 reg-val 0x70010 data 0
Module-1# deb platform internal usd aquantia op 1 port 10 reg-val 0x7c800 data 0
Module-1# deb platform internal usd aquantia op 1 port 10 reg-val 0x7c810 data 0
Module-1# deb platform internal usd aquantia op 1 port 10 reg-val 0x7c400 data 0
Module-1# deb platform internal usd aquantia op 1 port 10 reg-val 0x10009 data 0
Workaround
There is no workaround available to recover the impacted ports. Also, there is no procedure that can prevent the issue from occurring.
You can move the devices to other working ports.
Further Problem Description
FN74085 -- field notice raised for this issue.
After a reload, some RJ45 interfaces on Cisco Nexus N9K-C93108TC-FX3P Switches might not come up, even when connected.
Note: This issue can be triggered by a switch reload that occurs for any reason, including a software upgrade, software reset, system crash, or the power being turned up or down.
The problem is related only to the front-panel interfaces Ethernet 1/1- 1/48. Optical ports Ethernet 1/49 - 54 and MGMT0 port are not affected.
Issue fixed in 15.2.8h release.
