ccie lab exam reschedule policy due to system issue.UDLD technology can also avoid one-way link failures and cause switching loops, but UDLD is not a part of STP. When UDLD detects a unidirectional failure, the interface can be closed (Err-disable), so that the interface will not send and receive data, and the loop will naturally disappear. UDLD periodically sends Probe/Echo packets on each active interface to maintain the integrity of the neighbor cache.
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