Folks, i implemented a stackwise virtual for 9500-24Y4C. Pretty much everything works after the DAD and SVL link was set up by rebooting the box. I have verified the model and IOS version is capable of running VSS. After this is done, i unplugged the primary box cables (all including DAD and SVL) and power it off. The standby box took the role as active and i continued to move the primary box to another rack. Then, i powered it up and plugged the SVL links first followed by the DAD link. This is when i realized the current active box which was standby previously started to reboot itself. Question is, is this an expected behavior (or bug?) or if the steps i did to restore the primary box triggered the issue, which is plugging SVL links first instead of DAD links? I recall last time TAC told me if the DAD link is down, it wont have any impact to the operation of the VSS. Please advice.
Config below.
CORE_SW#sh stackwise-virtual link
Switch SVL Ports Link-Status Protocol-Status
------ --- ----- ----------- ---------------
1 1 HundredGigE1/0/25 U R
HundredGigE1/0/27 U R
2 1 HundredGigE2/0/25 U R
HundredGigE2/0/27 U R
CORE_SW#sh stackwise-virtual dual
In dual-active recovery mode: No
Recovery Reload: Enabled
Dual-Active-Detection Configuration:
-------------------------------------
Switch Dad port Status
------ ------------ ---------
1 TwentyFiveGigE1/0/24 up
2 TwentyFiveGigE2/0/24 up
CORE_SW#sh run int twe1/0/24
interface TwentyFiveGigE1/0/24
stackwise-virtual dual-active-detection
CORE_SW#sh run int twe2/0/24
interface TwentyFiveGigE2/0/24
stackwise-virtual dual-active-detection
CORE_SW#sh run int hu1/0/25
interface HundredGigE1/0/25
stackwise-virtual link 1
CORE_SW#sh run int hu1/0/27
interface HundredGigE1/0/27
stackwise-virtual link 1
CORE_SW#sh run int hu2/0/25
interface HundredGigE2/0/25
stackwise-virtual link 1
CORE_SW#sh run int hu2/0/27
interface HundredGigE2/0/27
stackwise-virtual link 1
CORE_SW#sh inv
NAME: "Switch 1 Chassis", DESCR: "Cisco Catalyst 9500 Series Chassis"
PID: C9500-24Y4C
CORE_SW#sh ver
Cisco IOS XE Software, Version 16.12.03a
