After UDLD is implemented, a Network Administrator noticed that one port stops receiving UDLD packets. This port continues to reestablish until after eight failed
retries. The port then transitions into the errdisable state. Which option describes what causes the port to go into the errdisable state?
A.
Normal UDLD operations that prevent traffic loops.
B.
UDLD port is configured in aggressive mode.
C.
UDLD is enabled globally.
D.
UDLD timers are inconsistent.
Explanation:
With UDLD aggressive mode enabled, when a port on a bidirectional link that has a UDLD neighbor relationship established stops receiving UDLD packets, UDLD
tries to reestablish the connection with the neighbor. After eight failed retries, the port is disabled.
http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/12- 2SX/configuration/guide/book/udld.html