What is the difference between a vswitch and a vro on the second layer?

Traditional switches can no longer meet the needs of Internet cafes. Currently, they are both L2 switches and belong to the OSI Layer 2, that is, the data link layer device.

As a hot spot in Internet cafes, Xiao Bian mainly talks about the difference between the second-layer switches and routers in Internet cafes.

1. subnet division: The switch can only recognize MAC addresses.

The MAC address is a physical address and uses a flat address structure. Therefore, you cannot divide subnets Based on the MAC address. Vro identifies IP addresses. IP addresses are allocated by network administrators. They are logical addresses and IP addresses have hierarchies. They are divided into network numbers and host numbers, which can be easily used to divide subnets, the main function of a vro is to connect to different networks.

2. Loop: Based on the vswitch address learning algorithm and the station table, no loop is allowed between vswitches.

Once a loop exists, the Spanning Tree Algorithm must be enabled to block the ports that generate the loop. The router routing protocol does not solve this problem. There are multiple channels between routers to balance the load and improve reliability.

3. Broadcast control: A vswitch can only narrow down the conflicted domain, but not the broadcast domain.

The entire exchange network is a large broadcast domain, where broadcast packets are scattered across the entire exchange network. Vrouters can isolate broadcast domains, and broadcast packets cannot be broadcast through vrouters.

4. centralized load: only one channel is available between switches, so that information is concentrated on one communication link and cannot be dynamically allocated to balance the load.

The router routing protocol algorithm can avoid this. The OSPF routing protocol algorithm can not only generate multiple routes, but also select different optimal routes for different network applications.

The main difference between a vswitch and a vro on the second layer of an internet cafe is the above. It is essential to use a vswitch on an internet cafe. The biggest advantage of a vswitch is that it is fast and easy to implement with ASIC. Therefore, the forwarding speed is extremely high, vrouters are also essential.