H3C Technologies H3C WX5500E Series Access Controllers - Manual (Page 86)

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Step Command Remarks
1. Enter system view. system-view N/A
2. Configure the maximum hops
of the MST region.
stp max-hops hops The default setting is 20.
Configuring the network diameter of a switched
network
Any two terminal devices in a switched network are connected through a specific path composed of a
series of devices. The network diameter is equal to the number of devices on the path composed of the
most devices. The network diameter is a parameter that indicates the network size. A bigger network
diameter indicates a larger network size.
Based on the network diameter you configured, the system automatically sets an optimal hello time,
forward delay, and max age for the device.
When you configure the network diameter of a switched network, follow these guidelines:
• In STP/RSTP/MSTP mode, each MST region is considered as a device and the configured network
diameter is effective only for the CIST (or the common root bridge), but not for MSTIs.
• In PVST mode, the network diameter configuration is effective on the root bridge only.
To configure the network diameter of a switched network:
Step Command Remarks
1. Enter system view. system-view N/A
2. Configure the network
diameter of the switched
network.
• In STP/RSTP/MSTP mode:
stp bridge-diameter diameter
• In PVST mode:
stp vlan vlan-list bridge-diameter
diameter
Use one of the commands.
The default setting is 7.
Configuring spanning tree timers
The following timers are used for spanning tree calculations:
• Forward delay
It is the delay time for port state transition. To prevent temporary loops on a network, the spanning
tree sets an intermediate port state, the learning state, before it transitions from the discarding state
to the forwarding state. The port transitions its state after a forward delay timer expires to make
sure that the state transition of the local port remains synchronized with the peer.
• Hello time
The device detects whether a link failure has occurred with the hello time interval. The spanning
tree sends a configuration BPDU during every hello time interval. If the device receives no
configuration BPDUs within the hello time interval, it recalculates the spanning tree.
• Max age