Shulou(Shulou.com)06/03 Report--

Basic configuration of layer 3 switching: what is a layer 3 switch

​ layer 3 switch is a switch with some router functions, which works in the third layer of OSI network standard model: network layer. The most important purpose of layer 3 switch is to speed up the internal exchange of data in large local area networks, which can be routed once and forwarded many times. Layer 3 switching is equivalent to layer 2 switching plus layer 3 forwarding. Layer 3 switch has powerful routing transmission, bandwidth allocation, multimedia transmission and security control functions, which can divide different user groups according to different communication service systems and achieve efficient transmission between services.

Second: experimental purpose

It enables two hosts to communicate with each other on different VLAN in different network segments, and uses layer 3 switching to realize inter-vlan routing.

Three: experimental operation

GNS3

Three PCs and two switches (one layer two and one layer three)

1. Drag out these five devices in GNS3, first change the logo of the router to the switch, modify the hard disk memory, interface mode and name, and then mark them on the topology diagram for viewing.

2. First, configure SW1, divide f1Uniqure 1, f1plash 2, f1plash 3 into vlan10, vlan20, and vlan30, and f1Univer 0 is encapsulated by trunk.

3. To configure the layer 3 switch, first create a vlan10,20,30, then enter the f1apax interface for trunk, then configure the gateway address in the vlan, and finally check the routing table. See if the configuration is successful.

4. Finally, the three hosts are configured with ip addresses. When they ping each other, the ability to ping means that the three hosts communicate with each other. This experiment is completed.

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