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This article will explain in detail how to spanning tree protocol in stp. The editor thinks it is very practical, so I share it with you as a reference. I hope you can get something after reading this article.

1. Determine the role of the switch

Root switch: there is one and only one in the entire switching network

Non-root switch: the remaining switches are called non-root switches.

Note: each non-root switch will calculate the shortest, loop-free, layer 2 data forwarding path to the root switch, and eventually the path is in the "forwarding" state. Election principle: compare the BID (bridge ID) of each switch: priority + MAC address priority: default value is 32768; 2 bytes MAC address: use the MAC;6 bytes of the motherboard of the switch; comparison principle-first compare the priority, the smaller the better; secondly, compare the MAC address, the smaller the better; 2. Determine the role of the port root port: on each non-root switch, there is and only one. The port closest to the root switch; designated port: there is one and only one in each "network segment / segment"; the port closest to the root switch Non-designated port: all other ports, called "non-designated port" 3, determine the status of the port down-off (meaning that the current port does not have STP enabled) listening-listening, listening on all BPDU in the network in order to determine the role of the switch and port The port stays in this state for 15s; learning-learning, this stage is mainly to learn the source MAC address of the data frame received on the port, thus forming the MAC address table; the port stays in this state for 15s Forwarding-forwarding (final state), which implements the sending and receiving of packets blocking-blocking (final state), which cannot send and receive packets; can only receive BPDU.

Experimental steps and ideas:

one。 Configure the ip of the PC

Pc14:

Ip: 192.168.1.1

Subnet mask: 255.255.255.0

Gateway: 192.168.1.254

Pc15:

Ip: 192.168.2.1

Subnet mask: 255.255.255.0

Gateway: 192.168.2.254

Pc16:

Ip: 192.168.3.1

Subnet mask: 255.255.255.0

Gateway: 192.168.3.254

Pc17:

Ip: 192.168.4.1

Subnet mask: 255.255.255.0

Gateway: 192.168.4.254

Pc18:

Ip: 192.168.1.2

Subnet mask: 255.255.255.0

Gateway: 192.168.1.254

Pc19:

Ip: 192.168.2.2

Subnet mask: 255.255.255.0

Gateway: 192.168.2.254

Pc20:

Ip: 192.168.3.2

Subnet mask: 255.255.255.0

Gateway: 192.168.3.254

Pc21:

Ip: 192.168.4.2

Subnet mask: 255.255.255.0

Gateway: 192.168.4.254

Pc10:

Ip: 192.168.1.3

Subnet mask: 255.255.255.0

Gateway: 192.168.1.254

Pc11:

Ip: 192.168.2.3

Subnet mask: 255.255.255.0

Gateway: 192.168.2.254

Pc12:

Ip: 192.168.3.3

Subnet mask: 255.255.255.0

Gateway: 192.168.3.254

Pc13:

Ip: 192.168.4.3

Subnet mask: 255.255.255.0

Gateway: 192.168.4.254

two。 Create vlan and add ports to and set up trunk

1. Create a vlan on sw1 and add the port:

Vlan batch 10 20 30 40

Interface g0/0/3

Port link type-access

Port default vlan 10

Interface g0/0/4

Port link type-access

Port default vlan 20

Interface g0/0/5

Port link type-access

Port default vlan 30

Interface g0/0/6

Port link type-access

Port default vlan 40

Set up the trunk:

Interface ge0/0/1

Port link-type trunk

Port trunk allow-pass vlan all

Interface ge0/0/2

Port link-type trunk

Port trunk allow-pass vlan all

two。 Create a vlan on sw2 and add the port:

Vlan batch 10 20 30 40

Interface g0/0/3

Port link type-access

Port default vlan 10

Interface g0/0/4

Port link type-access

Port default vlan 20

Interface g0/0/5

Port link type-access

Port default vlan 30

Interface g0/0/6

Port link type-access

Port default vlan 40

Set up the trunk:

Interface ge0/0/1

Port link-type trunk

Port trunk allow-pass vlan all

Interface ge0/0/2

Port link-type trunk

Port trunk allow-pass vlan all

3. Create a vlan on sw3 and add the port:

Vlan batch 10 20 30 40

Interface g0/0/6

Port link type-access

Port default vlan 10

Interface g0/0/5

Port link type-access

Port default vlan 20

Interface g0/0/4

Port link type-access

Port default vlan 30

Interface g0/0/3

Port link type-access

Port default vlan 40

Set up the trunk:

Interface ge0/0/1

Port link-type trunk

Port trunk allow-pass vlan all

Interface ge0/0/2

Port link-type trunk

Port trunk allow-pass vlan all

three。 Configure MSTP spanning Tr

1. First determine the root switch and the secondary root switch on the sw1,sw2,sw3

Display stp brief View stp

Here sw2 is the root switch and sw1 is the secondary root switch

2.STP parameter modification (Huawei):

(1) modify the STP priority of the switch:

[SW] stp priority {value}-> must be a multiple of 4096

(2) modify the STP mode of the switch

[SW] stp mode {stp | rstp | mstp}

(3) modify the STP cost of the switch port:

[SW] interface fas0/13

[sw-fas0/13] stp cost {value}

(4) turn off / enable STP on the switch:

[sw] stp disable-> close STP

[sw] stp enable-> enable STP. Default is enabled.

3. Configure MSTP

MST domain (region), which can contain multiple instances at the same time

MSTI (instance), that is, MST instance. A MSTI can be associated with multiple VLAN at the same time.

1. Configure MST region on sw1

Stp region-configuration

Name of the region-name aaa configuration region

Instance 1 vlan 10 20

Instance 2 vlan 30 40

Active region-configuration

. Configure MST region on sw2

Stp region-configuration

Name of the region-name aaa configuration region

Instance 1 vlan 10 20

Instance 2 vlan 30 40

Active region-configuration

3. Configure primary and secondary roots

1. Configure the primary root on sw2

Stp instance 1 priority 0

Stp instance 2 priority 4096 sets SW2 as the root of the instance id

two。 Configure the primary root on sw1

Stp instance 2 priority 0

Stp instance 1 priority 4096 sets SW1 as the root of the instance id

4. Verification

Display stp instance (id)

four. Verification, test

Block any line between I switches to see if it can be connected to the whole network.

It can realize full Netcom, which shows that the experiment is successful.

This is the end of this article on "how to spanning Tree Protocol for stp". I hope the above content can be of some help to you, so that you can learn more knowledge. if you think the article is good, please share it for more people to see.

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