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MindMap Gallery MSTP multi-service transmission technology introductory tutorial mind map

MSTP multi-service transmission technology introductory tutorial mind map

This is a mind map of the introductory tutorial on MSTP multi-service transmission technology. It organizes what is MSTP and expands it to discuss MSTP, basic concepts, messages, topology calculations, and fast convergence mechanisms. Come and take a look!

Edited at 2023-02-20 20:16:39

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MSTP multi-service transmission technology introductory tutorial mind map

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Outline

MSTP multi-service transmission technology introductory tutorial mind map

What is MSTP

Expand and discuss MSTP

basic concept

MST domain

Features of devices in the MST domain

MSTI/MSTI domain root

Features of MSTI

IST

CST

CIST

Features of CIST

port role

Two new port roles are added, a total of 7 types, RP, DP, Alternate, Backup, edge port, Master port, Domain edge port

port status

message

Tell me what the message is like? What is the function of this message?

Similarities and differences between the RST BPDU message and the RST BPDU message. The first 36 bytes are the same as the RST BPDU message, and the 37th byte is the MSTP proprietary field. The final MSTI configuration information field is composed of several MSTI configuration information groups concatenated.

Topology calculation

Let’s talk about the composition and development of MSTP network from a broad perspective

Important concepts in MSTP configuration information

1. Root switch device ID

2. External path overhead

3. Domain root ID

4. Internal path overhead

5. Specify switching device

6. Specify port

7. Receive port

Calculate CST

Calculate IST

Calculate MSTI

① Each MSTI calculates its own spanning tree independently without interfering with each other. ② The spanning tree calculation method of each MSTI is basically the same as that of STP. ③ The spanning tree of each MSTI can have different roots and different topologies. ④ Each MSTI sends BPDU within its own spanning tree. ⑤ The topology of each MSTI is determined through command configuration. ⑥ The spanning tree parameters of each port on different MSTIs can be different. ⑦ The role and status of each port on different MSTIs can be different.

A vlan message is forwarded along the following path

① Within the MST domain, forward along its corresponding MSTI. ② Between MST domains, forward along CST.

Fast convergence mechanism

PA mechanism in MSPT

①Normal method

② Enhancement method

As shown in the figure, in MSTP, the enhanced P/A mechanism works as follows: ① The upstream device sends a Proposal message requesting fast migration. After the downstream device receives the Set the port connected to the upstream device as the root port and block all non-edge ports. ② The upstream device continues to send Agreement messages. After being received by the downstream device, the root port changes to Forwarding status. ③ The downstream device responds with the Agreement message. After the upstream device receives it, it connects to the downstream device The port is set to 78 as the designated port, and the designated port enters the Forwarding state.