QuestionQ42

高级路由交换技术

Which statements about PFC deadlock detection are true?

Choose three
  • A After deadlock detection is enabled on a switch, the switch ignores received PFC frames.
  • B After deadlock detection is enabled on a switch, the switch automatically disables PFC if a deadlock occurs multiple times within a period of time, which can be configured by the network administrator.
  • C After deadlock detection is enabled on a switch, the switch stops sending traffic in the corresponding queue when receiving the first PFC frame.
  • D After deadlock detection is enabled on a switch, the switch starts a timer when receiving the first PFC frame.
Explanation

PFC pauses transmission only for the affected priority queue when a PFC pause frame is received, and PFC deadlock detection starts a detection timer for that condition. A configurable threshold can count deadlock occurrences during a configured period; when the count exceeds the threshold, PFC is disabled for the corresponding 802.1p priority. PFC frames are not ignored merely because deadlock detection is enabled.

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