X440 Stack master and standby

[Mateusz_Haba]

Hi,

Recently, I created a stack in daisy-chain topology consisting of 2 X440-G2-48p-10G4 switches.

Stack created fine, but the second node (slot 2) became standby whereas should be a backup node.

I did reboot of the whole stack a couple of times but that didn’t help. Should I try to reboot slot 2 as a master capable? Here are some details:

Slot-1 X440-Office # show stacking detail
Stacking Node 00:04:96:9e:7a:f2 information:
   Current:
      Stacking                  : Enabled
      Role                      : Master
      Priority                  : Automatic
      Slot number               : 1
      Stack state               : Active
      Master capable?           : Yes
      Stacking protocol         : Enhanced
      License level restriction : <none>
      In active topology?       : Yes
      Factory MAC address       : 00:04:96:9e:7a:f2
      Stack MAC address         : 02:04:96:9e:7a:f2
      Alternate IP address      : <none>
      Alternate gateway         : <none>
      Stack Port 1:
         State                  : Link down
         Blocked?               : No
         Control path active?   : No
         Selection              : Alternate (49)
      Stack Port 2:
         State                  : Operational
         Blocked?               : No
         Control path active?   : Yes
         Selection              : Alternate (50)
   Configured:
      Stacking                  : Enabled
      Master capable?           : Yes
      Slot number               : 1
      Stack MAC address         : 02:04:96:9e:7a:f2
      Stacking protocol         : Enhanced
      License level restriction : <none>
      Stack Port 1:
         Selection              : Alternate (49)
      Stack Port 2:
         Selection              : Alternate (50)

Stacking Node 00:04:96:cc:d6:d7 information:
   Current:
      Stacking                  : Enabled
      Role                      : Standby
      Priority                  : Automatic
      Slot number               : 2
      Stack state               : Active
      Master capable?           : No
      Stacking protocol         : Enhanced

Slot-1 information:
     State:               Operational
     Description:         none
     Download %:          100
     Restart count:       0 (limit 5)
     Serial number:       800618-00-11 1721N-42040
     Hw Module Type:      X440G2-48p-10G4
     SW Version:          30.4.1.2
     SW Build:            30.4.1.2
     Configured Type:     X440G2-48p-10G4
     Ports available:     52
     Recovery Mode:       Reset
     Node MAC:            02:04:96:9E:7A:F2
     Current State:       MASTER
     Image Selected:      primary
     Image Booted:        primary
     Primary ver:         30.4.1.2
     Secondary ver:       22.4.1.4
     Config Selected:     primary.cfg

Slot-2 information:
     State:               Operational
     Description:         none
     Download %:          100
     Restart count:       0 (limit 5)
     Serial number:       800618-00-18 1915N-41867
     Hw Module Type:      X440G2-48p-10G4
     SW Version:          30.4.1.2
     SW Build:            30.4.1.2
     Configured Type:
     Ports available:     52
     Recovery Mode:       Reset
     Node MAC:            02:04:96:9E:7A:F2
     Current State:       STANDBY
     Image Selected:      primary
     Image Booted:        primary
     Primary ver:         30.4.1.2
     Secondary ver:       30.4.1.2
     Config Selected:     primary.cfg

I used port 50 (alternate) for stacking. 

[Ronald_Dvorak]

2 Switches but use 2 Stacking links/cables = a ring 🙂

-Ron

[Mateusz_Haba]

How else could I make a stack of 2 switches?

[FredrikB]

I would not do a daisy-chain topology. Always try to make it a ring if at all possible. If only one cable or port breaks you have a split-brain stack and most likely a wire-speed loop on your hands.

[Mateusz_Haba]

 Thank you for you comment Stefan. I did it on Slot 1 and it worked! I missed that part in manual.

However, I was surprised because I always stack 2 switches like that and never had such issue. Weird.

Thanks for help!