コンテンツ

  1. HOME
  2. Services
  3. Kyoto University Integrated Network System (KUINS)
  4. On-campus Network(KUINS)
  5. Thr usage
  6. Automatic shutdown in loop fault

Automatic shutdown in loop fault

  1. Loop fault
    External data will be kept being forwarded without deleted in the route when the annular route was created by the misconnection, which eventually fills out the communications zone in the LAN and causes the shutdown of network switch etc.
  2. The shutdown after detecting loop
    To prevent this fault, we carry out the measure to shut down the information socket on detecting loop. In carrying out this measure,we notice the manager by mail. Managers are required to report the reason of occurance, the content of measure, the measure for prevention. After confirming the report, shutdown will be cancelled.
  3. Main reasons
    • Two endwise from the same LAN cable were connected to the two-port information socket.
    • Two endwise from the same LAN cable were connected to the HUB to the information socket.
    • Two LAN cables from the separate information sockets are connected to the same HUB.
    • Two HUB connected to the separate information socket were connected with one LAN cable.
  4. Measures to prevent loop
    • Attach the tag(destination label) to the two edges of LAN cable and make the connection source and access point clear.
    • HUB has to be set to the easily viewable location, not behind the shelf, not under the desk.
    • Decide the network manager in your room and grasp the network structure. In changing, you are required to have manager's permission.
    • Create the network connection chart and display it in the readily visible place.
    • Use the HUB with loop detecting function.
 

Copyright © Institute for Information Management and Communication, Kyoto University, all rights reserved.