Which of the following descriptions of headroom caching is correct in CloudFabric lossless networking?

Question

Options

• AHeadroom cache space actually occupies the Guaranteed cache of the inbound queue
• BThe headroom cache room is fixed at 20M
• CThe headroom cache is used to store packet
• Dreceived from the time when the queue sends a PFC backpressure notification packet to before

• A
  7% (2)
• B
  19% (5)
• C
  70% (19)
• D
  4% (1)

Explanation

The headroom cache space occupies the shared cache of the inbound queue, because the cache of the queue is allocated by the port cache, and the cache of the port is allocated by the plane cache, so only when the plane cache is sufficient, can the sufficient headroom be guaranteed Cache space to ensure lossless packet forwarding of lossless queues. The Ranging Headroom check function allows you to calculate the amount of cache space you need based on the configured port long-haul mode (i.e., link distance) and port rate.

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