C9500-40X dual active problem

[ortelacl]

Scenario#1
The dual-active does not work as indicated. When we remove the dual-active link both switches shutdown there access interfaces. Only 1 switch should shutdonw its access interfaces.
The dual-active is directly configured over the two switches (direct link). [hardware = C9500-40X, image = Cisco IOS Software [Fuji], Catalyst L3 Switch Software (CAT9K_IOSXE), Version 16.8.1a, RELEASE SOFTWARE (fc1)].

Scenario#2
When we configured the dual-active over de access layer. The stand-by switch disable all its access interfaces when we turn of the active switch. Fail-over does not work. 
Does anyone have experience this problem? Please help.

[andresfr]

Hello ortelacl,

According to documentation:

---

DUAL ACTIVE DETECTION
----------------------
If a StackWise Virtual link fails, the Cisco StackWise Virtual standby switch 
cannot determine the state of the Cisco StackWise Virtual active switch. To 
ensure that switchover occurs without delay, the Cisco StackWise Virtual 
standby switch assumes that the Cisco StackWise Virtual active switch has 
failed and initiates switchover to take over the Cisco StackWise Virtual 
active role. The original Cisco StackWise Virtual active switch enters 
recovery mode and brings down all the interfaces except the StackWise 
Virtual link and the management interfaces. 

---

So, the dual-active detection triggers when there's StackWise Virtual link failure, and not when there's a failure of the Dual-Active-Detection link. Only the original Cisco StackWise Virtual active switch should be the one entering in recovery mode and bringing down all the interfaces except the StackWise Virtual link and management interfaces. The original standby switch will now become the new active switch with all its interfaces enabled and working.

---

Recovery Actions
-----------------

A Cisco StackWise Virtual active switch that detects a dual-active condition shuts
down all of its non-SVL interfaces to remove itself from the network. The switch 
then waits in recovery mode until the SVLs have been recovered. You should 
physically repair the SVL failure and the recovery switch should be manually 
reloaded for it to be the standby switch. 

---

Reference link:

Dual-Active Detection

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9500/software/release/16-8/configuration_guide/ha/b_168_ha_9500_cg/b_168_ha_9500_cg_chapter_011.html#concept_sjb_byx_31b

Can you please share your current configuration for this StackWise Virtual setup?

Also, provide the output of the following commands

show stackwise-virtual

show stackwise-virtual switch 1

show stackwise-virtual switch 2

show stackwise-virtual link

show stackwise-virtual neighbors

show stackwise-virtual dual-active-detection

Regards,

[ortelacl]

!
redundancy
mode sso
main-cpu
standby console enable
!

------------------------------------------------------------------

!
stackwise-virtual
domain 1
dual-active detection pagp trust channel-group 1
dual-active detection pagp trust channel-group 2
dual-active detection pagp trust channel-group 3
dual-active detection pagp trust channel-group 4
dual-active detection pagp trust channel-group 5
dual-active detection pagp trust channel-group 6
dual-active detection pagp trust channel-group 8
dual-active detection pagp trust channel-group 10
dual-active detection pagp trust channel-group 11
dual-active detection pagp trust channel-group 12
dual-active detection pagp trust channel-group 13
dual-active detection pagp trust channel-group 14
dual-active detection pagp trust channel-group 15
dual-active detection pagp trust channel-group 16
dual-active detection pagp trust channel-group 17

-------------------------------------------------------

show stackwise-virtual
Stackwise Virtual Configuration:
--------------------------------
Stackwise Virtual : Enabled
Domain Number : 1

Switch Stackwise Virtual Link Ports
------ ---------------------- ------
1 1 TenGigabitEthernet1/0/37
TenGigabitEthernet1/0/38
TenGigabitEthernet1/0/39
2 1 TenGigabitEthernet2/0/37
TenGigabitEthernet2/0/38
TenGigabitEthernet2/0/39

 -----------------------------------------------

show stackwise-virtual switch 1
Stackwise Virtual Configuration:
--------------------------------
Stackwise Virtual : Enabled
Domain Number : 1

Switch Stackwise Virtual Link Ports
------ ---------------------- ------
1 1 TenGigabitEthernet1/0/37
TenGigabitEthernet1/0/38
TenGigabitEthernet1/0/39

-----------------------------------

show stackwise-virtual switch 2
Stackwise Virtual Configuration:
--------------------------------
Stackwise Virtual : Enabled
Domain Number : 1

Switch Stackwise Virtual Link Ports
------ ---------------------- ------
2 1 TenGigabitEthernet2/0/37
TenGigabitEthernet2/0/38
TenGigabitEthernet2/0/39

--------------------------------------

!

show stackwise-virtual link
Stackwise Virtual Link(SVL) Information:
----------------------------------------
Flags:
------
Link Status
-----------
U-Up D-Down
Protocol Status
---------------
S-Suspended P-Pending E-Error T-Timeout R-Ready
-----------------------------------------------
Switch SVL Ports Link-Status Protocol-Status
------ --- ----- ----------- ---------------
1 1 TenGigabitEthernet1/0/37 U R
TenGigabitEthernet1/0/38 U R
TenGigabitEthernet1/0/39 U R
2 1 TenGigabitEthernet2/0/37 U R
TenGigabitEthernet2/0/38 U R
TenGigabitEthernet2/0/39 U R

-------------------------------------------

show stackwise-virtual neighbors
Stackwise Virtual Link(SVL) Neighbors Information:
--------------------------------------------------
Switch SVL Local Port Remote Port
------ --- ---------- -----------
1 1 TenGigabitEthernet1/0/37 TenGigabitEthernet2/0/39
TenGigabitEthernet1/0/38 TenGigabitEthernet2/0/38
TenGigabitEthernet1/0/39 TenGigabitEthernet2/0/37
2 1 TenGigabitEthernet2/0/37 TenGigabitEthernet1/0/39
TenGigabitEthernet2/0/38 TenGigabitEthernet1/0/38
TenGigabitEthernet2/0/39 TenGigabitEthernet1/0/37

!

show stackwise-virtual dual-active-detection
Dual-Active-Detection Configuration:
-------------------------------------
Switch Dad port Status
------ ------------ ---------

-----------------------------------------------------------------------------

#show stackwise-virtual dual-active-detection pagp
Pagp dual-active detection enabled: Yes
In dual-active recovery mode: No

Channel group 1
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/1 Yes .d Te8/1/1 1.1
Te2/0/1 Yes Te1/1/1 1.1

Channel group 2
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/2 Yes  Te6/1/1 1.1
Te2/0/2 Yes Te1/1/1 1.1

Channel group 3
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/3 Yes Te6/1/1 1.1
Te2/0/3 Yes Te1/1/1 1.1

Channel group 4
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/4 Yes .d Te2/1/1 1.1
Te2/0/4 Yes  Te1/1/1 1.1

Channel group 5
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/5 Yes  Te1/1/2 1.1
Te2/0/5 Yes  Te1/1/1 1.1

Channel group 6
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/6 Yes  Te1/1/2 1.1
Te2/0/6 Yes  Te1/1/1 1.1

Channel group 7
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/7 No  Te2/1/1 N/A
Te2/0/7 No  Te1/1/1 N/A

Channel group 8
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/8 Yes  Te2/1/1 1.1
Te2/0/8 Yes  Te1/1/1 1.1

Channel group 9
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/9 No  N/A
Te2/0/9 No  N/A

Channel group 11
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/11 Yes  Te1/1/2 1.1
Te2/0/11 Yes  Te1/1/1 1.1

Channel group 12
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/12 Yes . Te2/1/1 1.1
Te2/0/12 Yes . Te1/1/1 1.1

Channel group 13
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/13 Yes . Te2/1/1 1.1
Te2/0/13 Yes . Te1/1/1 1.1

Channel group 14
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/14 Yes . Te1/1/1 1.1
Te2/0/14 Yes . Te2/1/1 1.1

Channel group 15
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/15 Yes . Te2/1/1 1.1
Te2/0/15 Yes . Te1/1/1 1.1

Channel group 16
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/16 Yes n. Te2/1/1 1.1
Te2/0/16 Yes n. Te1/1/1 1.1

Channel group 17
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/17 Yes n. Te1/1/2 1.1
Te2/0/17 Yes n. Te1/1/1 1.1

Channel group 18
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/18 No n. Te1/1/2 N/A
Te2/0/18 No n. Te1/1/1 N/A

Channel group 22
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/22 No n. Te1/1/2 N/A
Te2/0/22 No n. Te1/1/1 N/A

[ortelacl]

Scenario#1
--------------------------------------------------------------------------------------
!
n#show stackwise-virtual
Stackwise Virtual Configuration:
--------------------------------
Stackwise Virtual : Enabled
Domain Number : 1

Switch Stackwise Virtual Link Ports
------ ---------------------- ------
1 1 TenGigabitEthernet1/0/37
TenGigabitEthernet1/0/38
TenGigabitEthernet1/0/39
2 1 TenGigabitEthernet2/0/37
TenGigabitEthernet2/0/38
TenGigabitEthernet2/0/39

!
------------------------------------------------------------------------------------------
!
show stackwise-virtual switch 1
Stackwise Virtual Configuration:
--------------------------------
Stackwise Virtual : Enabled
Domain Number : 1

Switch Stackwise Virtual Link Ports
------ ---------------------- ------
1 1 TenGigabitEthernet1/0/37
TenGigabitEthernet1/0/38
TenGigabitEthernet1/0/39

nl-bxt1-mer1-cs01n#
!
show stackwise-virtual switch 2
Stackwise Virtual Configuration:
--------------------------------
Stackwise Virtual : Enabled
Domain Number : 1

Switch Stackwise Virtual Link Ports
------ ---------------------- ------
2 1 TenGigabitEthernet2/0/37
TenGigabitEthernet2/0/38
TenGigabitEthernet2/0/39
!
-----------------------------------------------------------------------------------------------
!
#show stackwise-virtual link
Stackwise Virtual Link(SVL) Information:
----------------------------------------
Flags:
------
Link Status
-----------
U-Up D-Down
Protocol Status
---------------
S-Suspended P-Pending E-Error T-Timeout R-Ready
-----------------------------------------------
Switch SVL Ports Link-Status Protocol-Status
------ --- ----- ----------- ---------------
1 1 TenGigabitEthernet1/0/37 U R
TenGigabitEthernet1/0/38 U R
TenGigabitEthernet1/0/39 U R
2 1 TenGigabitEthernet2/0/37 U R
TenGigabitEthernet2/0/38 U R
TenGigabitEthernet2/0/39 U R

!
--------------------------------------------------------------------------------------------------
!
show stackwise-virtual neighbors
Stackwise Virtual Link(SVL) Neighbors Information:
--------------------------------------------------
Switch SVL Local Port Remote Port
------ --- ---------- -----------
1 1 TenGigabitEthernet1/0/37 TenGigabitEthernet2/0/39
TenGigabitEthernet1/0/38 TenGigabitEthernet2/0/38
TenGigabitEthernet1/0/39 TenGigabitEthernet2/0/37
2 1 TenGigabitEthernet2/0/37 TenGigabitEthernet1/0/39
TenGigabitEthernet2/0/38 TenGigabitEthernet1/0/38
TenGigabitEthernet2/0/39 TenGigabitEthernet1/0/37

#
!
show stackwise-virtual dual-active-detection
Dual-Active-Detection Configuration:
-------------------------------------
Switch Dad port Status
------ ------------ ---------

nl-bxt1-mer1-cs01n#

!

#sh stackwise-virtual ba
sh stackwise-virtual bandwidth
Switch Bandwidth
------ ---------
1 30
2 30

---------------------------------------------------------------------------

!

sh stackwise-virtual dual-active-detection p
#sh stackwise-virtual dual-active-detection pagp
Pagp dual-active detection enabled: Yes
In dual-active recovery mode: No

Channel group 1
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/1 Yes  Te8/1/1 1.1
Te2/0/1 Yes  Te1/1/1 1.1

Channel group 2
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/2 YesTe6/1/1 1.1
Te2/0/2 Yes Te1/1/1 1.1

Channel group 3
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/3 Yes  Te6/1/1 1.1
Te2/0/3 Yes  Te1/1/1 1.1

Channel group 4
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/4 Yes Te2/1/1 1.1
Te2/0/4 Yes n Te1/1/1 1.1

Channel group 5
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/5 Yes Te1/1/2 1.1
Te2/0/5 Yes  Te1/1/1 1.1

Channel group 6
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/6 Yes  Te1/1/2 1.1
Te2/0/6 Yes  Te1/1/1 1.1

Channel group 7
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/7 No Te2/1/1 N/A
Te2/0/7 No Te1/1/1 N/A

Channel group 8
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/8 Yes  Te2/1/1 1.1
Te2/0/8 Yes Te1/1/1 1.1

Channel group 9
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/9 No  Te2/1/1 N/A
Te2/0/9 No  Te1/1/1 N/A

Channel group 10
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/10 Yes  Te2/1/1 1.1
Te2/0/10 Yes  Te1/1/1 1.1

Channel group 11
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/11 Yes Te1/1/2 1.1
Te2/0/11 Yes  Te1/1/1 1.1

Channel group 12
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/12 Yes nl. Te2/1/1 1.1
Te2/0/12 Yes . Te1/1/1 1.1

Channel group 13
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/13 Yes. Te2/1/1 1.1
Te2/0/13 Yes Te1/1/1 1.1

Channel group 14
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/14 Yes Te1/1/1 1.1
Te2/0/14 Yes nTe2/1/1 1.1

Channel group 15
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/15 Yes  Te2/1/1 1.1
Te2/0/15 Yes Te1/1/1 1.1

Channel group 16
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/16 Yes  Te2/1/1 1.1
Te2/0/16 Yes  Te1/1/1 1.1

Channel group 17
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/17 Yes  Te1/1/2 1.1
Te2/0/17 Yes  Te1/1/1 1.1

Channel group 18
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/18 No  Te1/1/2 N/A
Te2/0/18 No . Te1/1/1 N/A

Channel group 22
Dual-Active Partner Partner Partner
Port Detect Capable Name Port Version
Te1/0/22 No . Te1/1/2 N/A
Te2/0/22 No . Te1/1/1 N/A
#