HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 2 - LAN Switching Co - Page 134
stp transmit-limit
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After the network topology is stabilized, each non-root-bridge device forwards configuration BPDUs to the surrounding devices at the interval of hello time to check whether any link is faulty. If a device does not receive a BPDU from the upstream device within nine times the hello time, it will assume that the upstream device has failed and start a new spanning tree calculation process. In a stable network, this kind of spanning tree calculation may occur because the upstream device is busy. You can avoid such unwanted spanning tree calculations by lengthening the timeout time (by setting the timeout factor to 4 or more), saving the network resources. HP recommends you to set the timeout factor to 5, 6, or 7 for a stable network. Related commands: stp timer hello. Examples # Set the timeout factor of the device to 7. system-view [Sysname] stp timer-factor 7 stp transmit-limit Syntax stp transmit-limit limit View undo stp transmit-limit Ethernet interface view, Layer 2 aggregate interface view Default level 2: System level Parameters limit: Sets the maximum number of BPDUs the ports can send within each hello time, in the range of 1 to 255. Description Use stp transmit-limit to set the maximum number of BPDUs that the ports can send within each hello time. Use undo stp transmit-limit to restore the default. By default, the maximum transmission rate of all ports is 10. Each port can send up to 10 BPDUs within each hello time. Configured in Ethernet interface view, the setting takes effect only on the interface. Configured in Layer 2 aggregate interface view, the setting takes effect only on the aggregate interface. Configured on a member port in an aggregation group, the setting takes effect only after the port leaves the aggregation group. A larger maximum transmission rate value requires more system resources. An appropriate maximum transmission rate setting can prevent spanning tree protocols from using excessive bandwidth resources during network topology changes. HP recommends that you use the default value. Examples # Set the maximum transmission rate of port GigabitEthernet 1/0/1 to 5. system-view 126