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You need STP [ Spanning Tree Protocol ] &nbsp;(on managed) switches to PREVENT this.<br />
And careful when setting up cabling...
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You need STP [ Spanning Tree Protocol ]  (on managed) switches to PREVENT this.
And careful when setting up cabling...

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my scenario is below:<br />
<br />
HP 2530 &lt;-- unmanaged switch 01&lt;-- unmanaged switch02<br />
<br />
What she loop the cable is on unmanage switch switch 02.From this scenario ,we turn on the spt on the switch port in HP 2530 will help ?
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my scenario is below:

HP 2530 <-- unmanaged switch 01<-- unmanaged switch02

What she loop the cable is on unmanage switch switch 02.From this scenario ,we turn on the spt on the switch port in HP 2530 will help ?

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<div class="content wysiwyg-content">
Recenly we received call from our client said that network down and we visit onsite found that is looping .<br />
<br />
She buy two unmanage switch try to connect by her self ,we found out she connect one of the cable back to the switch .<br />
<br />
Actually they have are using HP 5130 as the core switch and all the access switch is HP/Aruba 2530.<br />
<br />
I would like seek for expert advice ,what we can help them to avoid this problem occur again.
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Recenly we received call from our client said that network down and we visit onsite found that is looping .

She buy two unmanage switch try to connect by her self ,we found out she connect one of the cable back to the switch .

Actually they have are using HP 5130 as the core switch and all the access switch is HP/Aruba 2530.

I would like seek for expert advice ,what we can help them to avoid this problem occur again.

network looping

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.

Switches / Hubs

Troubleshooting is a problem-solving process of evaluating faults that occur in a mechanical or electronic system. Steps often include recreating the problem and then trying alternative and creative solutions in order to fix the situation. Troubleshooting is deployed when software or hardware are rendering abnormal responses or remain unresponsive.

Troubleshooting

Network design and methodology, also known as network architecture, is the design of a communication network. It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as data formats used in its operation. In telecommunication, the specification of a network architecture may also include a detailed description of products and services delivered via a communications network, as well as detailed rate and billing structures under which services are compensated.