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What is a spanning tree?

# spanning tree is generally used in redundant links, that is, in a network, in order to prevent physical failure of the link, the loop is logically disconnected

/ / if there are no redundant links in a network, there will be no loops and spanning trees will not be used.

Definition: in a redundant link, in order to prevent broadcast storms, open the loop

# function: in a switched network, in the case of redundant links, the forwarding of layer 2 logical loops is prevented

The working process of 2stp

# determine the switch role

Determine the port role

Determine the port statu

# the roles of the switch are as follows:

# switches: one and only one in the entire network

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

# determine the role of the port

# root port: on a non-root switch, the nearest port to the root switch is the root port

Designated port: all ports on the root switch are designated ports

Non-designated port: all other ports are non-designated port

Election principle: usually compare priority first. If the priority is the same, then compare mac, / / priority and mac address. The smaller the value, the better.

Non-designated ports are subdivided into:

Alternate port

Backup port

The status of # port is:

Down

Listening

Learning

Forwarding

Blocking

# Type of spanning tree:

# stp

Rstp

Mstp

# Note: Cisco's spanning tree is a vlan, a tree, while Huawei's is a switch and a tree

However, Huawei's switch can create an area, create an instance in the area, and then set the priority to the instance / / set the priority of the instance, which is equivalent to a vlan and a tree in Cisco.

# examples:

If I want to do vlan 10, vlan 20 as the primary root and vlan30,vlan40 as the secondary root / / Huawei

# Prime Minister creates vlan 10, vlan 20, vlan 30 vlan 40 on the switch

# and add the corresponding port to the corresponding vlan / / omit

# create an area

Stp religon-configuration

Religon-name test / / give the created area a name

Instance 1 vlan10 vlan20 / / create instance 1, and add vlan10 and vlan20 to the instance

Active religon-configuration / / Activation

Stp instance 1 prirority 0 / / set priority to the instance-equivalent to setting priority for vlan within Cisco

# above is Huawei's switch settings spanning tree

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