Context

After the stack powered on, review key indicators on the switch panels to confirm the stack has been established successfully.

Procedure

• Press the mode switching button on any member switch to set the mode status indicator to work in STACK mode. A switch has a STCK indicator, which indicates the stack mode status. After you press the MODE button, the indicator is steady green or blinking and off in 45 seconds, indicating that the switch has entered the STACK mode.

  • If the mode status indicators on all the member switches change to the STACK mode, the stack has been established successfully. You can determine the stack IDs of the master switch and member switches by viewing the mode status indicator and service port indicators.
  • If the mode status indicators on some member switches do not change to the STACK mode, the stack has not been established.
• Determine the stack IDs of the master switch and member switches through the status of service port indicators. Table 9-28 explains how to interpret service port indicators in STACK mode.

  Table 9-28  Service port indicators in STACK mode

  Color	Status and Meaning
  Off	Port indicators do not indicate the stack ID of the switch.
  Green	If the indicator is steady on, the switch is not the master switch in the stack. If the indicator is blinking, the switch is the master switch in the stack. If the indicator of a port is steady on, the switch where this port is located is not the master switch, and the number of this port is the stack ID of this switch. If the indicator of a port is blinking, the switch where this port is located is the master switch, and the number of this port is the stack ID of this switch. If the first nine port indicators of the switch are steady on, this switch is not the master switch, and its stack ID is 0. If the first nine port indicators of the switch are blinking, this switch is the master switch, and its stack ID is 0.

• Switches of different models cannot set up a stack.
• A switch does not support the stacking function.
• A switch has no electronic label or an incorrect electronic label.
• Stack ports are incorrectly connected.
• Stack cables are faulty.
• The stack reserved VLAN is occupied.
• MAC addresses of stack member switches conflict.

1. Check the switch model.

   Run the display device command to check the device model.

   <HUAWEI> display device
   S5720-28P-LI-AC's Device status:
   Slot Sub  Type                Online    Power      Register     Status   Role
   -------------------------------------------------------------------------------
   0    -    S5720-28P-LI        Present   PowerOn    Registered   Normal   Master

   • If switches of different models cannot set up a stack or a switch does not support the stacking function, replace the switch.
   • If the switches support stacking, proceed to the next step.

2. Check that a correct electronic label has been loaded to the switch.

   Run the display elabel command to view the electronic label.

   <HUAWEI> display elabel
   /$[System Integration Version] 
   /$SystemIntegrationVersion=3.0 
   
   
   [Slot_0]
   /$[Board Integration Version]
   /$BoardIntegrationVersion=3.0
   
   
   [Main_Board]
   
   
   /$[ArchivesInfo Version]
   /$ArchivesInfoVersion=3.0
   
   
   [Board Properties]
   BoardType=CX22EMGEB
   BarCode=21023518320123456789
   Item=02351832
   Description=S5720-28P-LI,LS5ZC48CM,S5720-28P-LI Mainframe
   Manufactured=2009-02-05
   VendorName=Huawei
   IssueNumber=
   CLEICode=
   BOM=

   • If all fields under [Board Properties] are empty, no electronic label has been loaded to the switch. Replace the switch.

   • If fields under [Board Properties] are not empty, an electronic label has been loaded to the switch. Proceed to the next step.

3. Check the stack cables.

   Run the display stack port command to check whether stack cables are correctly connected.

   <HUAWEI> display stack port
   *down : administratively down 
   Logic Port         Phy Port                     Online       Status
   ----------------------------------------------------------------------------
   stack-port0/1      GigabitEthernet0/0/1         present      up
   stack-port1/2      GigabitEthernet1/0/1         present      up

   • If the physical member ports are in the Up state, proceed to the next step.

   • If the status of a physical member port is in the Down state, check whether the switch connected to the port has been powered off or is restarting. If so, check whether the port status is in the Up state after the connected switch restarts. If not, replace the stack cable.

   • If the fault persists, proceed to the next step.

4. Check whether the stack reserved VLAN is occupied.

   Run the display stack command to check the reserved VLAN of a member switch. By default, the reserved VLAN is 4093.

   Run the display vlan vlan-id command. If the reserved VLAN is not occupied, proceed to the next step.

   <HUAWEI> display vlan 4093
   Error: The VLAN does not exist. 

   • If the reserved VLAN is occupied, run either of the following commands to rectify the fault:

     • Run the stack reserved-vlan vlan-id command in the system view to modify the reserved VLAN.
     • Delete services in the reserved VLAN and run the undo vlan vlan-id command in the system view to delete the VLAN.

   • If the fault persists, proceed to the next step.

5. Check whether MAC addresses of member switches conflict with each other.

   Run the display stack command to check whether the MAC address of the switch to be added to the stack conflicts with the MAC address of an existing member switch. If not, proceed to the next step.

   <HUAWEI> display stack
   Stack mode: Service-port
   Stack topology type: Link
   Stack system MAC: 0018-82b1-6eb4
   MAC switch delay time: 2 min
   Stack reserved vlan: 4093 
   Slot of the active management port: -- 
   Slot    Role        Mac address       Priority   Device type
   -------------------------------------------------------------
       0   Master      0018-82b1-6eb4    200        S5720-28P-LI-AC
       1   Standby     0018-82b1-6eba    150        S5720-28P-LI-AC
   

6. Collect the following information and contact technical support personnel.
   • Results of the preceding troubleshooting procedure
   • Configuration file, logs, and alarms of switches

• Relevant Alarms

  • A stack port goes Up: FSP_1.3.6.1.4.1.2011.5.25.183.1.22.1 hwStackLinkUp
  • A stack port goes Down: FSP_1.3.6.1.4.1.2011.5.25.183.1.22.2 hwStackLinkDown
  • A switch has joined the stack: FSP_1.3.6.1.4.1.2011.5.25.183.1.22.6 hwStackStackMemberAdd
  • A switch has left the stack: FSP_1.3.6.1.4.1.2011.5.25.183.1.22.7 hwStackStackMemberLeave
  • Logical ports with the same ID on two switches are connected: FSP_1.3.6.1.4.1.2011.5.25.183.1.22.9 hwStackLogicStackPortLinkErr
  • Physical ports of the same logical port are connected to different devices: FSP_1.3.6.1.4.1.2011.5.25.183.1.22.10 hwStackPhyStackPortLinkErr

• Relevant Logs

  None