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Configuring MSTP

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 MSTI Internal Root Path Cost: MSTI internal root path cost, effective only in the

Ministry of MST region (4 bytes).

 MSTI Bridge Priority: MSTI bridge priority, and the CIST Bridge Identifier of the MAC

address of the MSTI configuration information with the composition of the sending

bridge (1 byte).

 MSTI Port Priority: MSTI port priority, and the CIST Port Identifier of the port ID with

the composition of MSTI send port configuration information (1 byte).

 MSTI Remaining Hops: MST BPDU packets remaining in the MSTI in hops (1 byte).

23.3.2 Determining CIST Priority Vectors

The MSTP role of each bridge is calculated based on the information carried in BPDUs.

The most important information carried in BPDUs is the spanning tree priority vector. The

following part introduces how to calculate the CIST priority vectors and MSTI priority vectors.

The CIST priority vector consists of common root bridge, external root path cost, regional

root, internal root path cost, designated bridge ID, designated port ID, and the

BPDU-receiving port ID.

1. Detailed as below:

2. CIST root id

3. CIST external root path cost

4. CIST regional root id

5. CIST internal root path cost

6. CIST designated bridge id

7. CIST designated port id

8. CIST receiving port id

9. These parameters exist prior, the superior the more precedence.

23.3.3 Determining MSTI Priority Vectors

The MSTI priority vector consists of common root bridge, external root path cost, regional

root, internal root path cost, designated bridge ID, designated port ID, and the

BPDU-receiving port ID.

1. Detailed as below:

2. MSTI regional root id

3. MSTI internal root path cost

4. MSTI designated bridge

5. MSTI designated port

FoxGate S6424-S2C2 series User Manual

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