On previous networks, the second layer was the fastest data transmission device, the router was relatively slow, physically removed, and sent to other ports.
The goal of the network engineer is to maximize the distribution, distribution, and distribution of distributors. They divide these layers into 2 layers, which causes cyclic problems.
To solve this problem,
Engineers have used the wood protocol, but it still provides flexibility and precision in communication. With the advancement of technology, routers have become faster and cheaper, allowing wires to move faster.
Therefore, without affecting the network performance, the router moves to the middle and distribution layers. Users are subdivided into separate VLANs and subnets, and network engineers begin designing distribution schemes as 3 level portals for using VLANs.
Thus, each distribution switch requires a unique IP address that matches the VLAN key. The 3-layer path is used between the port distribution and the main layer switch. Since the two-layer topology does not have a single physical cycle, engineers do not rely on tree protocols.
We can also create multi-layer (SVI) and 2-layer virtual interfaces for VLANs. However, VLAN paths can only be created on a multi-layer transmitter (using 3 layers).
A powerful virtual interface is not a physical port, so it is called a virtual interface. It operates on a multi-layer key, such as a router interface, and can be configured as a router interface.
SVI offers all owners of this VLAN 3 packet processing layers. When you need an SVI configuration, make sure the key is a well-known VLAN.
In the image above, the key must be VLAN 100 and VLAN 200, otherwise the SVI interface will remain the same. Reasons why we need SVI.
Provide gateway for VLAN.
Assign a 3-layer IP connection to the transmitter.
Support for marketing protocols and bridge configuration
A toolkit of two VLANs requires a VLAN interface using the Virtual Interface (SVI). The processing steps are as follows.
With the help of “IP routing” we create paths on the switch. If we do not do this online, we will not be able to communicate with other VLANs. With this command, the transmitter creates a source table of IP address information in the virtual interface.
We can check the IP configuration using the “IP Routing” and “Startup Configuration” commands. The figure below shows a dynamic root table.
Like I said before, we can configure the Virtual Interface (SVI) interface for third and second layer switches, but the difference is “IP root”. In 2 layer keys, we use the Virtual Interface (SVI) key for the remote control.
We can test the interface with the command “Show IP interface briefly”. It looks like we used a command to test the router interface.
The command will show all ports and virtual interfaces. If we want to view all ports and the VLAN interface, we can use the “Show Interface” command. If we need the desired interface, we can use a command with an interface ID, such as the “show vlan 100 interface” that reflects the settings in the VLAN 100 interface. For other orders you can read my previous articles. .
Advantages and disadvantages
The powerful virtual interface (SVI) is faster than a router because not everything is active and inactive.
You do not need external router links to access the Internet.
This removes the online limit as other transmission channels can be placed between the keys.
Disadvantages
The disadvantage of 3 layer keys is that they are very expensive.
InterVLAN onlineization, in other words, can be achieved using SVI root (switching to a virtual interface) between VLANs. Here we need a multi-layered transition. 2-layer switches may have SVI, but only one. This is SVI contract management for VLAN 1.
To inter-VLAN route, we must first use the “ip routing” command on the multi-layer key for the VLAN. By following this command, we can create a virtual interface for each VLAN and assign an IP address to that SVI (Download Virtual Interface). Then, a multi-layer key is applied to ensure communication between these VLANs.
Entering the world of third-party keys, one of the first concepts we know of is SVI (Virtual Interface Exchange).
This virtual interface, in essence, is logical, it does not have a physical port attached to it, but it functions as a single layer, second and third layer.
SVI is generally defined by the VLAN as the portal for the most advanced devices belonging to this transmission domain.
It performs 3 layers of root for VLAN packages, which means that we can configure most of the 3 layer functions (IP, ACL, QoS, etc.) in these interfaces.
