Layer 3 switches converge and connect four Layer 2 switches

According to the landlord's meaning, is it just to get the network through?

Network part: Solution 1, if there is only one VLAN for each Layer 2, first, create the required VLAN at Layer 3, and secondly, give the created VLAN an address, that is, your gateway address! Then, the interfaces from Layer 2 to Layer 3 can be assigned to the corresponding VLAN, and Layer 2 does not need to be configured!

Solution 2: Each Layer 2 switch has multiple VLANs, first, create the required VLAN at Layer 3, and secondly, give the created VLAN an address, that is, your gateway address! The interface from Layer 2 to Layer 3 is changed to truck mode, and the corresponding VLAN is created at Layer 2 and the interface connected to Layer 2 is assigned to the corresponding VLAN. Or use VTP, Layer 3 Server, Layer 2 Client!

For the host part, if there is only one host and one VLAN under each layer 2, it is recommended to use solution 1, otherwise use solution 2!

The host is equipped with the corresponding IP address, and the gateway is a Layer 3 VLAN address. Or configure the DHCP service at Layer 3

You can do VTP services, layer 3 as server, layer 2 as client, if necessary, you can change to transparent mode. Then the third layer divides the VLAN, and the next two layers will automatically learn. It is also possible to divide it manually by yourself.

If it is a Cisco device, first establish a VLAN in global mode

vlan 10

name vlan10 (name self-defined).

Go directly to the corresponding interface:

int range f0 1-5, enter the fast ether port of 0-5.

sw m a

sw a vlan 10。

show VLAN brief allows you to view the VLAN assignment of a port.

The question is too vague, what kind of switches are they?

First, the characteristics are different.

1 Core switches: Allow end users to access the network, so access layer switches have the characteristics of low cost and high port density.

2 Layer 3 Core Switches: Provides an optimized and reliable backbone transmission structure through high-speed** communication, enabling core switches with higher reliability, performance, and throughput.

3 Aggregation Layer Switching Layer: It is the main aggregation point of the multiple access layer switch.

Second, the functional bridge is different.

1. Core switch: directly connected to the external network, the most widely used, especially suitable for general offices, small computer rooms, business departments with centralized business acceptance, multi-production centers, management centers and other departments.

2 Layer 3 core PBX: Link aggregation is supported to ensure that the traffic from the distributed layer switch to the core layer switch has sufficient bandwidth.

3 Aggregation Layer Switching Layer: It must be able to handle all traffic from access layer devices and provide uplinks to the core layer.

Third, the ports are different.

1 Core switch: provides multi-port with 10m 100m 1000m adaptive capability.

3 Aggregation Layer Switching Layer: As a result, aggregation layer switches require higher version performance, fewer envy cores, and higher switching rates than access layer switches.

L1 switches support only physical layer protocols.

Layer 2 switches support physical layer and data link layer protocols, such as Ethernet switches, Layer 3 switches support physical layer, data link layer and network layer protocols, such as some switches with routing functions.

In terms of the hierarchical structure of ISO OSI, switches can be divided into Layer 2 switches, Layer 3 switches, etc.

Layer 2 switches refer to traditional switches that work on the second layer of the OSI reference model - the data link layer, and the traditional router can also solve this problem when used with external switches, but now the processing speed of the router can no longer keep up with the bandwidth requirements. Therefore, Layer 3 switches, web switches, etc. came into being.

A Layer 3 switch is a device with a Layer 3 switching function, that is, a Layer 2 switch with a Layer 3 routing function, but it is an organic combination of the two, and it is not simply a superposition of the hardware and software of the router device on the LAN switch.

Network Switch Role:

Connecting to the same type of network, when the network scales, it becomes impractical to simply extend the network cable. And for different LANs, in order to realize data transmission between each other and share network resources, it is necessary to have special connection equipment to realize network expansion. At the same time, the increase of sites in the network, the expansion of geographical scope, and the growth of business volume have promoted the rapid development of network interconnection.

The rapid development of network interconnection has led to the emergence of network switching technology, and network switches have also come into being. A switch in a broad sense is a device that completes the function of information exchange in a communication system.

Interconnect different types of networks, switches can connect different types of networks, such as Ethernet and Fast Ethernet, in addition to connecting the same type of network.

Fast network service is available. Sometimes in order to provide faster access, we can connect some important network computers directly to the port of the switch. In this way, the network's key servers and important users have faster access speeds and support greater information traffic.

1. Use network cable pliers to cut the network cable with a length of about 1 meter. Then use a network cable pliers to peel off the outer skin of the network cable with a length of about 3 cm.

2. Arrange the exposed double intersection lines in the following order.

3. Put the network cables in order, send them parallel to the crystal head, and use the network cable pliers to press the network cable and the crystal head. Then one end of the cascade line is done.

4. After doing one end, we start to do the other end and repeat the previous three steps. In particular, it should be noted that in the order of arranging network cables, remember to reverse the order of 1 and 3, 2 and 6. Put the sorted network cables into the crystal head and press them tightly with the network cable pliers.

So that the cascade line is done.

This one is categorized by hierarchical design. Simple Understanding:

Access layer – connect to end customers.

Distribution layer (aggregation layer) - the interconnection of switches.

Core Layer - High-Speed Data**

They do not correspond to the type of switch they belong to.

These three layers are a design concept and are not necessarily related to the actual type of switch. For a small network, all three layers can be used with ordinary switches, right? For large networks, high-speed, high-performance, and high-reliability switches are selected for the core layer as much as possible.

To add.

Generally, the core aggregation is a Layer 3 (network layer) device, and if the budget is sufficient, the access is also a Layer 3 (network layer) device.

Do the switches we usually use at home belong to the access layer? Or is it the second layer?

The switch here is usually a Layer 2 (MAC layer) switch.

Layer 2 switches are widely used, so they are not new to us. Let's talk about the differences between Layer 2 aggregation switches and Layer 3 core switches.

01 Layer 2 switches support physical layer and data link layer protocols, such as Ethernet switches, Layer 2 switches and hub hubs, while Layer 3 switches support physical layer, data link layer and network layer protocols.

02 Different working levels, the Layer 2 switch works at the data link layer, and the Layer 3 switch works at the network layer. Layer 3 switches not only achieve high packet speeds**, but also achieve optimal network performance for different network conditions.

03 Performance differences, the core switch should be a Layer 3 switch first, with high speed**, high-capacity interface bandwidth and large backplane processing power.

04 The function is different, the Layer 2 switch accesses based on MAC address, only executes data**, and cannot configure IP address. Layer 3 switches combine Layer 2 switching technology with Layer 3**.