Cisco Stackwise virtual (9407) and Cisco VSS (6509) etherchannel conn

[Ismael10]

Dear community,

I had a weird behavior with my switches. 

By connecting a VSS domain (6509, domain ID 200) and stackwise virtual (9407, domain ID 150) via one etherchannel link of two ports, it crashed completely the entire production network.

Does anyone encounter this kind of issue ?

[balaji.bandi]

because domain id ? i do not believe that was the casue, may be spanning tree, how this was connected very important.

[Ismael10]

they were directly connected via one Port-channel link :

ten1/5/0/20 --------- to ------ ten1/1/12

ten2/5/0/20 --------- to ------ ten2/1/12

Catalyst 9407 's conf :

interface TenGigabitEthernet1/5/0/20
description ===== TO OLD CORE : Ten1/1/12 =====
switchport trunk native vlan 999
switchport trunk allowed vlan 1,25,75-77,121,414,1001,1110
switchport mode trunk
channel-protocol lacp
channel-group 20 mode active
end

NEW-SW_CORE#show running-config interface tenGigabitEthernet 2/5/0/20
Building configuration...

Current configuration : 263 bytes
!
interface TenGigabitEthernet2/5/0/20
description ===== TO OLD CORE : Ten2/1/12 =====
switchport trunk native vlan 999
switchport trunk allowed vlan 1,25,75-77,121,414,1001,1110
switchport mode trunk
channel-protocol lacp
channel-group 20 mode active
!

Catalyst 6509 's conf :

interface TenGigabitEthernet1/1/12
description ===== TO NEW CORE : Ten1/5/0/20 =====
switchport
switchport trunk native vlan 999
switchport mode trunk
switchport trunk allowed vlan 1,25,75-77,121,414,1001,1110
channel-protocol lacp
channel-group 15 mode active
end

SW-CORE-VSS-DM#show running-config interface tenGigabitEthernet 2/1/12
Building configuration...

Current configuration : 275 bytes
!
interface TenGigabitEthernet2/1/12
description ===== TO NEW CORE : Ten2/5/0/20 =====
switchport
switchport trunk native vlan 999
switchport mode trunk
switchport trunk allowed vlan 1,25,75-77,121,414,1001,1110
channel-protocol lacp
channel-group 15 mode active

[balaji.bandi]

Did you captured any Logs both the side while the incident occured, what was fix you applied, removed the Links  between device ? or rebooted the device ?

[Ismael10]

Unfortunately, I didn't have enough time to take logs, I just removed the links between devices.

[balaji.bandi]

even though you removed the Links, the Logs till store in device if the devices are not rebooted.