When Rx-Drop Happen?

Rx drop happen when we cannot send to destination. As a result, switch will not put it to egress buffer How a port works

If that so then it doesn't know what to do, eventually will have tail drop.

This is normally happen when:

• IP destination is incorrect
• Mac address destination is incorrect
• We receive too much rx packets and we cannot tx enough which leads to Tail dropping
  • Could be we're receiving PFC pause frame, and trying to send PFC pause to upstream. However upstream doesn't pause.