User manual

Choose the menu Spanning Tree→STP Security→TC Protect to load the following page.

Figure 7-11 TC Protect

The following entries are displayed on this screen:

 TC Protect

TC Threshold: Enter a number from 1 to 100. It is the maximum number of the

TC-BPDUs received by the switch in a TC Protect Cycle. The

default value is 20.

TC Protect Cycle: Enter a value from 1 to 10 to specify the TC Protect Cycle. The

default value is 5.

7.5 Application Example for STP Function

 Network Requirements

 Switch A, B, C, D and E all support MSTP function.

 A is the central switch.

 B and C are switches in the convergence layer. D, E and F are switches in the access layer.

 There are 6 VLANs labeled as VLAN101-VLAN106 in the network.

 All switches run MSTP and belong to the same MST region.

 The data in VLAN101, 103 and 105 are transmitted in the STP with B as the root bridge. The

data in VLAN102, 104 and 106 are transmitted in the STP with C as the root bridge.

 Network Diagram