Note:
The port status of one port in different spanning tree instances can be different.
Global configuration Procedure for Spanning Tree function:
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1 | Make clear roles the switches | Preparation. |
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| play | in | spanning | tree |
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2 | Globally | configure MSTP | Required. Enable Spanning Tree function on the switch | ||||||||
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| and | configure | MSTP | parameters | on | Spanning | ||
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| Tree→STP Config→STP Config page. |
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3 | Configure | MSTP | parameters | Required. Configure MSTP parameters for ports on | |||||||
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| Spanning Tree→Port Config→Port Config page. | ||||||
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4 | Configure the MST region |
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| switch | plays | in the | MST region | on | Spanning |
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| Tree→MSTP Instance→Region Config and Instance | |||||
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5 | Configure | MSTP | parameters | Optional. Configure different instances in the MST region | |||||||
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| Spanning Tree→MSTP Instance→Instance Port | |||||
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7.4 STP Security
Configuring protection function for devices can prevent devices from any malicious attack against STP features. The STP Security function can be implemented on Port Protect and TC Protect pages.
Port Protect function is to prevent the devices from any malicious attack against STP features.
7.4.1 Port Protect
On this page you can configure loop protect feature, root protect feature, TC protect feature, BPDU protect feature and BPDU filter feature for ports. You are suggested to enable corresponding protection feature for the qualified ports.
¾Loop Protect
In a stable network, a switch maintains the states of ports by receiving and processing BPDU packets from the upstream switch. However, when link congestions or link failures occurred to the network, a down stream switch does not receive BPDU packets for certain period, which results in spanning trees being regenerated and roles of ports being reselected, and causes the blocked ports to transit to forwarding state. Therefore, loops may be incurred in the network.
The loop protect function can suppresses loops. With this function enabled, a port, regardless of the role it plays in instances, is always set to blocking state, when the port does not receive BPDU packets from the upstream switch and spanning trees are regenerated, and thereby loops can be prevented.
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