"Ti layman" network knowledge note 53 Layer switching technology

In this case, we talked about the one-arm routing feature, he can solve the communication between the VLANs, but if there is more than one VLAN in a route data transfer

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The increase of VLAN leads to the increase of data volume, and the path between router and switch becomes the bottleneck of the whole network.

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In order to solve this problem, we will use three layer switching technology to realize the communication between the VLAN, the three layer switch can do two-layer switching and three-layer forwarding.

We also use an experiment to look at the specific configuration implementation process

Experiment:

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Description: sw3l is a layer three switch, sw2l is a two layer switch,

Configuration steps:

Configuration of SW3;

Enable

VLAN data

VLAN 1

VLAN 2

VLAN 3 enters VLAN configuration mode creation Vlan1 2 3

Exit

Config

int VLAN 1

IP Add 192.168.1.1 255.255.255.0 (1.0 network Segment Gateway)

No sh exit VLAN configuration mode Enter global configuration Enter VLAN 1 virtual interface Configure IP and subnets and enable

Exit

int VLAN 2

IP add 192.168.2.1 255.255.255.0 (2.0 network segment Gateway)

No sh enters VLAN 2 virtual interface to configure IP and subnets and enable

Exit

int VLAN 3

IP Add 192.168.3.1 255.255.255.0 (3.0 network segment Gateway)

No sh enters VLAN 3 virtual interface to configure IP and subnets and enable

The SW3 configuration is basically complete.

Configuration of the SW2:

Enable

VLAN data

VLAN 1

VLAN 2

Valn 3 Creating VLANs 1 2 3

Exit

Config

int F0/2

Switch Access VLAN 2

Exit

int F0/3

Switch Access VLAN 3 enters F0/2 F0/3 interface configuration mode respectively, F0/2 joins vlan2 F0/3 add vlan3 here to explain the default all physical connection The port belongs to Vlan1 so F0/1 don't need to be configured

The SW2 configuration is complete.

PC-side Configuration

PC1 IP 192.168.1.2 Gateway 192.168.1.1

PC2 IP 192.168.2.2 Gateway 192.168.2.1

PC3 IP 192.168.3.2 Gateway 192.168.3.1

So PC 1 2 3 can communicate with each other.

Have you ever thought that I created the VLAN on the SW3 and then went to the SW2 to create the VLAN, where the two-tier exchange only one, VLAN only 3, if there are more two-layer switches, and need to configure 10? 20 of them? Even more VLANs? is not a lot of work, very troublesome. In the next section we will talk about the VTP configuration, which can be easily solved.

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"Ti layman" network knowledge note 53 Layer switching technology