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Network blood test

Here is a short list with things everyone should check in order to make sure their network is OK
  • No shared Ethernet segments are saturated (no more than 40 percent sustained network utilization). New segments should use switched and not shared technology.
  • No WAN links are saturated (no more than 70 percent sustained network utilization).
  • The response time is generally less than 100ms (one-tenth of a second). More commonly less than 2ms in a LAN.
  • No segments have more than 20 percent broadcasts or multicast traffic. Broadcasts are sent to all hosts in a network and should be limited. Multicast traffic is sent to a group of hosts but should also be controlled and limited to only those hosts registered to receive it.
  • No segments have more than one cyclic redundancy check (CRC) error per million bytes of data.
  • On the Ethernet segments, less than 0.1 percent of the packets result in collisions.
  • A CPU utilization at or over 75 percent for a 5-minute interval likely suggests network problems. Normal CPU utilization should be much lower during normal periods.
  • The number of output queue drops has not exceeded 100 in an hour on any Cisco router.
  • The number of input queue drops has not exceeded 50 in an hour on any Cisco router.
  • The number of buffer misses has not exceeded 25 in an hour on any Cisco router.
  • The number of ignored packets has not exceeded 10 in an hour on any interface on a Cisco router.
If all these are OK then the blood that flows through the veins of your network is OK!

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