Loop prevention issue in network switch

In layer 2 network environment especially in big network that running in spanning tree protocol, loop will always occurred.  When loop happen network will become congest and every user will be affected. Unless the network run in layer 3 environment than loop will only affect that switch only.

The issue is looping always happen in 3rd party unmanaged mini-switch. Refer to diagram below for a better understand.

How to connect Extremenetworks Summitx150 to a 3Com 5500G series

Today I learn a lesson that if you want to connect a Extremenetworks switch(SummitX150) to 3com 5500G series via layer 2 please remove pvid vlan management. Let say if your extremenetworks switch contain 2 vlan example vlan 2 is for pc and vlan 3 is for network management i.e. for remote access via telnet or ssh. What you need to do is to remove the pivd vlan in the interface that directly connect to extremenetworks switch.

3COM 5500G
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Function of Router

A router is a more sophisticated network device than either a switch or a hub. Like hubs and switches, network routers are typically small, box-like pieces of equipment that multiple computers can connect to. Each feature a number of "ports" the front or back that provide the connection points for these computers, a connection for electric power, and a number of LED lights to display device status. While routers, hubs and switches all share similar physical appearance, routers differ substantially in their inner workings.

Function of Network Switch

In home networking, hubs and switches are technically only there for the cable network. Wi-Fi routers include built-in access point that is roughly equivalent to moving the cable.

In the telecommunications network, the switch is a device to channel data from multiple input multiple ports for input into a specific output port that will take the data to the destination. In the traditional telephone network switching circuit, one or more switches are used to create a dedicated connection, either temporarily or circuit for an exchange between two or more parties.