Example for Configuring STP

Procedure

1. Configure the STP mode for the devices on the ring network. The configurations on SwitchB, SwitchC, and SwitchD are similar to the configurations on SwitchA, and are not mentioned here.

   <HUAWEI> system-view
   [~HUAWEI] sysname SwitchA
   [*HUAWEI] commit
   [~SwitchA] stp mode stp
   [*SwitchA] commit

2. Configure the root bridge and secondary root bridge.

   # Configure SwitchA as the root bridge.

   [~SwitchA] stp root primary
   [*SwitchA] commit

   # Configure SwitchB as the secondary root bridge.

   [~SwitchB] stp root secondary
   [*SwitchB] commit

3. Set a path cost for the ports to be blocked.

   The path cost value range depends on path cost calculation methods, which must be the same on all switches. This example uses the Huawei proprietary calculation method.

   # On SwitchA, set the path cost calculation method to the Huawei proprietary method.

   [~SwitchA] stp pathcost-standard legacy
   [*SwitchA] commit

   # On SwitchB, set the path cost calculation method to the Huawei proprietary method.

   [~SwitchB] stp pathcost-standard legacy
   [*SwitchB] commit

   # Set the path cost of 10GE1/0/1 on SwitchC to 20000.

   [~SwitchC] stp pathcost-standard legacy
   [*SwitchC] interface 10ge 1/0/1
   [*SwitchC-10GE1/0/1] stp cost 20000
   [*SwitchC-10GE1/0/1] commit
   [~SwitchC-10GE1/0/1] quit

   # On SwitchD, set the path cost calculation method to the Huawei proprietary method.

   [~SwitchD] stp pathcost-standard legacy
   [*SwitchD] commit

4. Enable STP to eliminate loops.

   • Disable STP on the port connected to the server.

     # Disable STP on 10GE1/0/2 of SwitchB.

     [~SwitchB] interface 10ge 1/0/2
     [~SwitchB-10GE1/0/2] stp disable
     [*SwitchB-10GE1/0/2] commit
     [~SwitchB-10GE1/0/2] quit

     # Disable STP on 10GE1/0/2 of SwitchC.

     [~SwitchC] interface 10ge 1/0/2
     [~SwitchC-10GE1/0/2] stp disable
     [*SwitchC-10GE1/0/2] commit
     [~SwitchC-10GE1/0/2] quit

   • Enable STP globally on devices.

     [~SwitchA] stp enable
     [*SwitchA] commit

     [~SwitchB] stp enable
     [*SwitchB] commit

     [~SwitchC] stp enable
     [*SwitchC] commit

     [~SwitchD] stp enable
     [*SwitchD] commit

5. Verify the configuration.

   After the preceding configuration is complete and the network becomes stable, perform the following operations to verify the configuration:

   # Run the display stp brief command on SwitchA to view the port roles and states. The following information is displayed:

   [~SwitchA] display stp brief
    MSTID  Port                        Role  STP State     Protection      Cost    Edged
        0  10GE1/0/1                   DESI  forwarding    none              2     disable
        0  10GE1/0/2                   DESI  forwarding    none              2     disable
   

   After SwitchA is configured as the root bridge, 10GE1/0/2 and 10GE1/0/1 connected to SwitchB and SwitchD respectively are elected as designated ports through spanning tree calculation.

   # Run the display stp interface 10GE 1/0/1 brief command on SwitchB to view the role and state of 10GE1/0/1. The following information is displayed:

   [~SwitchB] display stp interface 10ge 1/0/1 brief
    MSTID  Port                        Role  STP State     Protection      Cost    Edged
        0  10GE1/0/1                   DESI  forwarding    none              2     disable
   

   10GE1/0/1 is elected as a designated port and is in Forwarding state.

   # Run the display stp brief command on SwitchC to check the port roles and states. The following information is displayed:

   [~SwitchC] display stp brief
    MSTID  Port                        Role  STP State     Protection      Cost    Edged
        0  10GE1/0/1                   ALTE  discarding    none          20000     disable
        0  10GE1/0/3                   ROOT  forwarding    none              2     disable
   

   10GE1/0/1 is elected as an alternate port and is in Discarding state.

   10GE1/0/3 is elected as a root port and is in Forwarding state.