Nov 21, 2010 - 
Blueprint (CCIE R&S), Certification 
No Comments
Blueprint (CCIE R&S), Certification No Comments Loop Guard
To prevent loops that might develop if a port that should be blocking transitions to the forwarding state we have loop guard. This could happen if a port stops receiving BPDUs, maybe due to a unidirectional (on point-to-point) link or software/configuration problem on the neighbour.