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Understanding BPDU Guard vs. BPDU Filter: Key Differences and Use Cases

 Here's a simple guide on when to use BPDU Guard and BPDU Filter:


BPDU Guard:

  • Purpose: To protect the network from unauthorized devices or switches that could participate in the spanning tree process and potentially cause loops.
  • When to Use:
    • On access ports where end devices (like PCs, printers, or servers) are connected.
    • When you want to automatically shut down a port if a BPDU is received, indicating that another switch or device with STP capabilities is connected.
    • Ensures the network remains loop-free by disabling the port when an unexpected BPDU is detected.

BPDU Filter:

  • Purpose: To suppress the sending and receiving of BPDUs on a port, effectively preventing STP participation.
  • When to Use:
    • On edge ports (access ports) where you want to prevent STP interactions but don't want to shut the port down upon BPDU reception.
    • In specific scenarios like when you are sure that no switch will be connected, but you don’t want to disrupt the port's operation if a BPDU is accidentally received.
    • When temporary STP isolation is needed without triggering port shutdowns.

In summary:

  • Use BPDU Guard to protect your network by disabling ports where BPDUs are not expected.
  • Use BPDU Filter when you want to suppress BPDU processing but not shut down the port.
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