Loopback Detection Settings - D-Link xStack DES-3200 Series Reference Manual

The fields that can be configured are described below:
Parameter
BPDU Attack
Protection State
Trap State
Log State
Recover Time (60-
1000000)
From Port / To Port
State
Mode
Click the Apply button to accept the changes made for each individual section.

Loopback Detection Settings

The Loopback Detection (LBD) function is used to detect the loop created by a specific port. This feature is used to
temporarily shut down a port on the Switch when a CTP (Configuration Testing Protocol) packet has been looped
back to the Switch. When the Switch detects CTP packets received from a port or a VLAN, this signifies a loop on
the network. The Switch will automatically block the port or the VLAN and send an alert to the administrator. The
xStack® DES-3200 Series Layer 2 Managed Fast Ethernet Switch
Figure 8-43 BPDU Attack Protection window
Description
Click the radio buttons to enable or disable the BPDU Attack Protection state.
Specify when a trap will be sent. Options to choose from are None, Attack
Detected, Attack Cleared or Both.
Specify when a log entry will be sent. Options to choose from are None, Attack
Detected, Attack Cleared or Both.
Specify the BPDU protection Auto-Recovery timer. The default value of the recovery
timer is 60.
Select a range of ports to use for this configuration.
Use the drop-down menu to enable or disable the protection mode for a specific
port.
Specify the BPDU protection mode. The default mode is shutdown.
Drop – Drop all received BPDU packets when the port enters under attack state.
Block – Drop all packets (include BPDU and normal packets) when the port enters
under attack state.
Shutdown – Shut down the port when the port enters under attack state.
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