The possibility that the network setting may suddenly reset when inserting the cable into the switch hub product

The world's largest computer network equipment development companyCiscoThe issue of resetting the network settings when plugging and unplugging the cable to the switch hub product (Cisco) in 2013reportHowever, the corresponding product has already been deployed in data centers around the world, and network administrators have a headache.

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Products for which setting resetting problems are reported are supplied to data centersCisco Catalyst 3850 Series SwitchWhenCisco Catalyst 3650 Series SwitchTwo types of switching hub. The following photographs show four of the 3850 series 24 port models and 48 port models alternately superimposed.


This is the 3650 series, and four 24-port models and 48-port models are alternately stacked in 4 units.


For LAN cables used in data centers, etc., products whose protective parts (protective boot) covers the upper part of the cable removal tab are used to prevent cables from coming out of the equipment. In the switching hub in question, the protection part touched the reset button on the upper part of the port when inserting the cable to the leftmost port, and a short tone sounded "Pit", but in the last few seconds the factory It will be reset to factory setting.


It looks like this when I saw the switching hub and cable from the side. You can see that when you insert the cable the protective parts will hit the front of the reset button. There is a possibility that the network setting will be reset regardless of the size of the data center where this product is installed, and it may affect the entire network in the center.


According to Cisco's report, the problem with this button was found after the product was launched. As a countermeasure, "Use a cable without a protective part or a protective part cut out", "Use a reset button in the config mode To turn off the function of "Recommended".