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This article mainly introduces how to achieve spanning Tree Protocol PVST+ to prevent line encirclement and backup lines, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, let the editor take you to know about it.

First, the experimental requirements:

Different VLAN are interconnected. The traffic of the VLAN10 to which the PC1 belongs is forwarded through SW2, and the traffic of the VLAN20 to which the PC2 belongs is forwarded through SW3.

Second, the required equipment:

One layer 3 switching, three layer 2 switching, and two PCs

Third, technical explanation:

STP (spanning tree protocol, spanning Tree Protocol) is to adapt a ring structure into a tree structure. STP protocol is used to generate a logical tree structure by blocking some ports logically through an algorithm that exists in the physical loop network.

PVST+ Cisco private protocol, PVST+ generates a spanning tree MST for each VLAN to solve the single problem of STP.

Four: experimental topology:

Five: experimental steps:

1. Turn on all devices

two。 Optimization simulator

Select the R1 router terminal and enter it in terminal privilege mode

Close the terminal, right-click the device, select IDLE PC with *, and click OK to complete the optimization.

3. Configure VLAN10 and VLAN20 of SW1, and TRUNK port

SW1 (config) # vlan 10

SW1 (config-vlan) # vlan 20

SW1 (config-vlan) # int fa1/1

SW1 (config-if) # switchport mode access

SW1 (config-if) # switchport access vlan 10

SW1 (config-if) # int fa1/2

SW1 (config-if) # switchport mode access

SW1 (config-if) # switchport access vlan 20

SW1 (config-if) # int fa1/3

SW1 (config-if) # switchport mode trunk

SW1 (config-if) # switchport trunk encapsulation dot1q

SW1 (config-if) # int fa1/4

SW1 (config-if) # switchport mode trunk

SW1 (config-if) # switchport trunk encapsulation dot1q

4. Configure Trunk for SW2

SW2#conf t

SW2 (config) # int fa 1 Compact 1

SW2 (config-if) # switchport mode trunk

SW2 (config-if) # switchport trunk encapsulation dot1q

SW2 (config-if) # int fa1/10

SW2 (config-if) # switchport mode t

SW2 (config-if) # switchport trunk encapsulation dot1q

5. Configure PVST+ in SW2

SW2 (config) # vlan 10

SW2 (config) # vlan 20

SW2 (config-vlan) # ex

SW2 (config) # spanning-tree vlan 10

W2 (config) # spanning-tree vlan 10 root primary

6. View PVST+

SW2#show spanning-tree vlan 10

7. Configure PC IP address

8. Configure PVST+ and trunk port of SW3

SW3#conf t

SW3 (config) # vlan 10

SW3 (config-vlan) # vlan 20

SW3 (config-vlan) # int fa 1 Compact 5

SW3 (config-if) # switchport mode trunk

SW3 (config-if) # switchport trunk encapsulation dot1q

SW3 (config-if) # int fa 1 Compact 10

SW3 (config-if) # switchport mode trunk

SW3 (config-if) # switchport trunk encapsulation dot1q

SW3 (config) # spanning-tree vlan 20 root primary

9. Configure M1 layer 3 switch to terminate VLAN

M1#conf t

M1 (config) # int range fa1/1-2

M1 (config-if-range) # switchport mode trunk

M1 (config-if-range) # switchport trunk encapsulation dot1q

M1 (config) # vlan 10

M1 (config-vlan) # vlan 20

M1 (config-vlan) # int vlan 10

M1 (config-if) # ip add 192.168.10.1 255.255.255.0

M1 (config-if) # no shut

M1 (config-if) # int vlan 20

M1 (config-if) # ip add 192.168.20.1 255.255.255.0

M1 (config-if) # no shut

10. Verification

Before the Shut interface

In the Shut interface

After Shut interface

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