Network Element-Level Management Help >>Protocol Management >> Global MSTP Management

Global MSTP Management

Operation Procedure

1. Select the Resource tab.
2. Select the device to be managed from the device list to enter the Device Details page.
3. Click MSTP Management in the protocol management list.
4. After setting the corresponding protocol configuration information, click Config.
5. Click Default VLAN to restore the default VLAN-to-instance mapping.
6. Click Default Region to restore the default MST region name.
7. Click Apply to make the configurations take effect.

Parameter Description

• MSTP Status: The MSTP status can be Enable or Disable. Enable specifies to enable MSTP, while Disable specifies to disable MSTP.
• MSTP Type: The MSTP type can be STP, RSTP, or MSTP. This configuration item is designed to be compatible with switches supporting STP or RSTP. STP BPDUs and RSTP BPDUs can be recognized and used for spanning tree calculation on MSTP-enabled switches.
• Diameter: Configures the network diameter of a switched network. The network diameter parameter indicates the size of a network. The bigger the network diameter is, the larger the network size is. The network diameter is in the range of 2 to 7.
• Max Hops: Maximum hops of an MST region. The value limits the size of the MST region. The maximum hop count configured on the region root also acts as the maximum hop count of the MST region. As long as the forwarded BPDU in the region passes each switch from the root switch of the spanning tree, the hop count will deduct 1. The switch discards the received BPDU with the hop count of 0, and thus the switch outside the maximum hop count cannot forward the data because it cannot participate in the spanning tree calculation, consequently limiting the scale of the MST region. The larger the maximum hop count of an MST region is, the larger the scale of the MST region is. The scale of an MST region can be limited only when the maximum hop count is configured for the root switch of the MST region. Other switches in the MST region will adopt the configuration on the region root, even if the switch is configured accordingly.
• BPDU Protection: For access layer devices, the access port is usually connected to the user terminal (such as PC) or the file server. In this case, the access port is configured as an edge port to implement fast migration. When these ports receive BPDUs, the system will automatically configure these ports as non-edge ports and re-calculate the spanning tree, causing network topology instability. Under normal conditions, these ports should not receive STP BPDUs. If someone forges BPDUs maliciously to attack the switch, network topology instability will occur. You can prevent this type of attacks by utilizing the BPDU guard function. This configuration item can be Enable or Disable. Enable specifies to enable BPDU guard, while Disable specifies to disable BPDU guard. By default, BPDU guard is disabled on a switch.
• Admin Region Name: By default, the MST region name is the first MAC address of the MST region switch. All VLANs in the MST region belong to spanning tree instance 0, and the revision level of the MSTP region is 0. When the user configures the parameters related to the MST region, especially the VLAN-to-instance mapping table, network topology instability can be easily caused. To reduce such instability caused by the configurations, MSTP will not immediately trigger the re-calculation of the spanning tree upon processing the region-related configurations. The region-related configurations will take effect only when MSTP is enabled.
• Admin Revision Level: Revision level of MSTP. By default, the revision level is 0.
• Default Region: Configure the MST region name as the first MAC of the region switch in the MST region.
• Default VLAN: Map all VLANs to the MSTI 0.
• Apply: Enable all configurations to take effect.

Precautions

• For the region configuration to take effect, click Apply.