Working environment of IB switch: It can provide a unique electrical signal path for any two network nodes accessing the switch. The most common switch is an Ethernet switch.
Characteristics of IB switch: this technology is not used for general network connection, and its main design purpose is to solve the connection problem of server side. Therefore, InfiniBand technology will be applied to servers (such as replication, distributed work, etc. );
Communication between servers and storage devices (such as SAN and direct storage accessories) and communication between servers and networks (such as LAN, wan and Internet).
Extended data:
Working principle of IB switch:
Switches work at the second layer of the OSI reference model, namely the data link layer. When each port is connected successfully, the CPU inside the switch will match the MAC address with the port to form a MAC table. Packets sent to this MAC address will only be sent to its corresponding port, not all ports. Therefore, the switch can be used to divide the data link layer broadcast, that is, the collision domain; But you can't divide the network layer broadcast, that is, the broadcast domain.
The switch has a high bandwidth back-end bus and an internal switching matrix. All ports of the switch are hung on this back bus. After the control circuit receives the data packet, the processing port will look up the address comparison table in the memory to determine which port the NIC (network card) of the destination MAC (hardware address of the network card) hangs on.
Packets are quickly transmitted to the destination port through the internal switching matrix. If the destination MAC does not exist, it will be broadcast to all ports. After receiving the port response, the switch will "learn" the new MAC address and add it to the internal MAC address table.
Switches can also be used to "segment" the network. By comparing IP address tables, the switch only allows necessary network traffic to pass through the switch. Filtering and forwarding through the switch can effectively reduce the collision domain, but it cannot divide the network layer broadcast, that is, the broadcast domain.
Baidu encyclopedia -Infiniband
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