xStack DES-3526 / DES-3526DC Layer 2 Stackable Fast Ethernet Managed Switch User Manual
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Regulations and Restrictions for the LoopBack Detection Function
• All three versions of STP (STP, RSTP and MSTP) can enable this feature.
• May be configured globally (STP Global Bridge Settings), or per port (MSTP Port Information).
• Neighbor switches of the DES-3526 must have the capability to forward BPDU packets. Switches the fail to meet this
requirement will disable this function for the port in question on the DES-3526.
• The default setting for this function is disabled.
• The default setting for the LoopBack timer is 60 seconds.
• This setting will only be operational if the interface is STP-enabled.
• The LoopBack Detection feature can only prevent BPDU loops on the DES-3526 designated ports. It can detect a loop
condition occurring on the user’s side connected to the edge port, but it cannot detect the LoopBack condition on the elected
root port of STP on another switch.
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