Differences between vro and hub

 

From: http://www.ixpub.net/thread-669043-1-1.html

 

Hub ------- a hub is also called a hub. It works on the physical layer (bottom layer) and does not have a matching software system. It is a pure hardware device. A hub is used to connect a computer and other network terminals.

The Hub is a shared bandwidth. When any device connected to the Hub sends data, all other devices must wait. The device has full bandwidth, communication is complete, and other devices can use the bandwidth. As a result, the hub connects to a network with a conflict domain. All devices use each other in turn, just as if everyone had a zhuqiao together.

The Hub cannot determine the destination and type of data packets. Therefore, if broadcast data packets are still forwarded, and all devices send data to each interface in broadcast mode, in this way, the hub is connected to a broadcast domain network.

Switch ------- switch, which works on the data link layer (Layer 2). A slightly higher-end switch is supported by an operating system. Like a hub, it is mainly used to connect network terminal devices such as computers.

A vswitch is more advanced than a hub. It allows devices connected to a vswitch to communicate in parallel. For example, if a vehicle on a highway runs in parallel, communication between devices will not conflict, therefore, the switch breaks the conflict domain. Each interface of the switch is a conflict domain and does not conflict with other interfaces.

In addition, a system switch can record the MAC address table, and the sent data is not sent to each interface in broadcast mode, but directly to the Target Interface, saving the interface bandwidth. However, the vswitch and the hub cannot determine the broadcast data packet and send the broadcast to all interfaces. Therefore, the vswitch and the hub are connected to a broadcast domain network.

A high-end switch can not only record MAC address tables, but also divide VLAN (Virtual LAN) to isolate broadcast, but also cannot communicate between VLANs. To enable communication between VLANs, a layer-3 device must be involved.

Router ------- router, working at the network layer (Layer 3). All routers have their own operating systems for maintenance and need personnel debugging. Otherwise, they cannot work. Vrouters do not have so many interfaces and are mainly used to connect networks to networks.

Simply put, a router sends data from one network to another. This process is called routing. A vro not only isolates conflicting domains like a vswitch, but also detects broadcast packets and discards broadcast packets to isolate broadcast domains, effectively Expanding the network scale.

The route table is recorded in the router, and the router forwards data to achieve inter-network communication. Vro intervention enables communication between VLANs divided by vswitches.

Summary:

Hub: hardware-only, used to connect to network terminals, cannot break the conflict domain and broadcast domain.

Vswitch: it has a software system and is used to connect to a network terminal. It can break the conflict domain, but cannot split the broadcast domain.

Vro: it has a software system, is used to connect to the network, can break the conflict domain, can also be divided into broadcast domain, is a necessary device to connect to a large network