Why is the recommended value of STP network radius within 7

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According to the initial spanning tree protocol, the default interval for sending BPDUs is 2 seconds. It takes a switch about 1 second to receive and process BPDUs each time. An STP network can have a maximum of 20 hops.

According to the RSTP protocol, packets are aged after three intervals (6 seconds by default). If each hop spends 1 second for BPDU processing, a BPDU will time out after passing through 6 hops. Therefore, the recommended value of STP network radius cannot be greater than 7.

There are also some other considerations, such as bandwidth usage, storm range, and network maintainability and manageability.

Other related questions:
Why do I need to set an STP cost value after STP is enabled on an Eth-Trunk
After STP is enabled on an Eth-Trunk, STP cost values change when member interfaces on the Eth-Trunk change. If the Eth-Trunk is the root interface on the STP, the STP protocol will recalculate the topology of the network connected to the Eth-Trunk. If some interfaces on the network connect to terminals such as PCs and are not configured as edge interfaces, services will be interrupted for 30 seconds.

Why is the actual suppression value different from the configured traffic suppression value
The traffic suppression supported by AR series routers is a type of granularity-based suppression. -The AR1200 series use the committed information rate (CIR) mode. If the traffic suppression value is between 64 kbit/s and 1000 kbit/s, the granularity is 64 kbit/s. For example, if the traffic suppression value is set to 65 kbit/s, the effective traffic suppression value is 64 kbit/s. If the traffic suppression value is set to 200 kbit/s, the effective traffic suppression value is 128 kbit/s, and so on. If the traffic suppression value is between 1000 kbit/s and 100,000 kbit/s, the granularity is 1000 kbit/s. For example, if the traffic suppression value is set to 1001 kbit/s, the effective traffic suppression value is 1000 kbit/s. If the traffic suppression value is set to 2999 kbit/s, the effective traffic suppression value is 2000 kbit/s, and so on. -The AR2200 , AR3200 and AR3600 series use the packet mode. The granularity is 125 packets per second (pps). If the traffic suppression value is set to 10 pps, the effective traffic suppression value is 0 pps. If the traffic suppression value is set to 126 pps, the effective traffic suppression value is 125 pps, and so on. Therefore, if the traffic suppression value is not set to a multiple of the granularity, the actual suppression value is different from the traffic suppression value that is set. Within a specified granularity range, all suppression values are correct.

Why does RADIUS authentication fail when the RADIUS server template and RADIUS server are properly configured
This problem has the following possible causes: -The IP address of the router (a RADIUS client) is not configured on the RADIUS server, so the RADIUS server cannot send an authentication response packet to the router. -Different shared keys are configured on the router and the RADIUS server.

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