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User Guide
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Step Operation Description
4
Configure the MST region Create an MST Region and configure the role the
Switch plays in the MST Region on Spanning
Tree>>MSTP Instance>>Region Config and Tree>>MSTP
Instance>>Instance Config pages.
5
Configure the MSTP
Instance Ports parameters
If you are going to configure different Instances in the MST
Region you can configure MSTP parameters for Instance
Ports on Spanning Tree>>MSTP Instance>>Instance Port
Config page.
7.4 STP Security
STP Security can protect devices from malicious attacks against STP features. The STP
Security function can be implemented on Port Protect and TC Protect pages.
Port Protect is used to protect devices from malicious attacks against STP features.
7.4.1 Port Protect
On this page you can configure the Loop Protect, Root Protect, TC Protect, BPDU
Protect and BPDU Filter features for each Port. We suggest enabling the corresponding
Protection feature for the corresponding Ports.
Loop Protect
In a stable Network topology a Switch maintains the Port states by receiving and
processing BPDU packets from the Upstream Switch. However, when link congestion
or link failures occur, the Downstream Switch does not receive BPDU packets, which
can result in Spanning Tree regeneration and the Roles of Ports changing. This can cause
Blocked Ports to change to a Forwarding state, causing loops to occur in the Network.
The Loop Protect function suppresses Loops. With this function Enabled, a Port, regard-
less of the role it plays in any Instances, is always set to Blocking state when the Port
does not receive BPDU packets from the Upstream Switch. This allows Spanning Trees
to be regenerated, and prevents Loops from occuring.
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