Displaying And Maintaining Mstp - 3Com Switch 4800G 24-Port Configuration Manual

Switch 4800g family 24-port, pwr 24-port, 48-port, pwr 48-port, 24-port sfp

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Product manual (13 pages)

Datasheet (8 pages)

Configuration manual (27 pages)

Table of Contents

Enabling TC-BPDU

Attack Guard

Displaying and

Maintaining MSTP

Enter Ethernet

interface view

or port group

Enable the loop guard function

for the port(s)

When receiving a TC-BPDU (a PDU used as notification of topology change), the

device will delete the corresponding forwarding address entry. If someone forges

TC-BPDUs to attack the device, the device will receive a larger number of

TC-BPDUs within a short time, and frequent deletion operations bring a big

burden to the device and hazard network stability.

With the TC-BPDU guard function enabled, the device limits the maximum

number of times of immediately deleting forwarding address entries within 10

seconds after it receives TC-BPDUs to the value set with the stp tc-protection

threshold command (assume the value is X). At the same time, the system

monitors whether the number of TC-BPDUs received within that period of time is

larger than X. If so, the device will perform another deletion operation after that

period of time elapses. This prevents frequent deletion of forwarding address

Follow these steps to enable TC-BPDU attack guard:

Enter system view

Enable the TC-BPDU attack guard function

Configure the maximum number of times

the device deletes forwarding address

entries within a certain period of time

immediately after it receives TC-BPDUs

We recommend that you keep this feature enabled.

View the information about

abnormally blocked ports

View the information about ports

blocked by STP protection actions