Cisco show command explained

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show interfaces

  • Input Errors - total number of errors, includes runts, giants, no buffer, CRC, frame, overrun and ignored counts
  • Runts - discarded packets smaller then protocol allowed, eg. Ethernet frame smaller than 64 bytes
  • Giants - discarded packets exceeded protocol allowed size, eg. Ethernet frame grater than 1518 bytes
  • CRC - when calculated checksum is not the same as received
  • Output Errors - errors that prevented the final transmission of datagrams out of the interface that is being examined
  • Collisions - number of frames retransmitted due to Ethernet collisions
  • Late Collisions - a collision that occur after 512 bits of the frame have been transmitted
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