The problem of STP instance

Created: Dec 26, 2019 12:37:20Latest reply: Dec 26, 2019 12:38:10 82 1 0 0
  Rewarded HiCoins: 0 (problem resolved)

Hello, everyone.

As shown in the preceding figure, LSW1 and LSW2 are connected and STP is enabled. The configurations of the two switches are as follows:

STP problem


<LSW1>dis curr

sysname LSW1

vlan batch 372 400 418 423 426 436 446 500 515 3597

stp instance 1 priority 4096

stp enable

<LSW2>dis curr

sysname LSW2

vlan batch 172 372 400 418 423 426 3597

stp instance 0 root primary

stp enable

The problems are as follows:

1. Does STP instance 1 priority 4096 and STP instance 0 root primary belong to the same STP instance?

2. LSW1 has these VLANs: VLAN batch 372 400 418 423 426 436 446 500 515 3597, and LSW2 has these VLANs: VLAN batch 172 372 400 418 423 426 3597. Are only the same VLANs in the same STP instance?

Please help me solve the problem!


  • x
  • convention:

Featured Answers
DDSN
Admin Created Dec 26, 2019 12:38:10 Helpful(0) Helpful(0)

Hi, user_3357613
The STP instance is a concept in the MSTP region. Multiple switches form an MSTP region. A region can contain multiple instances. By default, all VLANs belong to instance 0. You can run the instance 1 vlan 10 20 command to add VLAN 10 20 to instance 1.
Problem 1: Instance 0 and instance 1 are two different instances.
Problem 2: The purpose of VLAN division is to isolate different broadcast domains. Therefore, traffic of the same VLAN must pass through different switches. The VLAN must exist on both switches. If a VLAN does not exist, traffic cannot be forwarded, not to mention instances.
For example, VLAN 372 400 418 423 426 3591 exists on both the active and standby nodes. By default, VLAN 372 400 418 423 426 3591 is in instance 0. You can specify which VLANs are in which instances.
  • x
  • convention:

All Answers
DDSN
DDSN Admin Created Dec 26, 2019 12:38:10 Helpful(0) Helpful(0)

Hi, user_3357613
The STP instance is a concept in the MSTP region. Multiple switches form an MSTP region. A region can contain multiple instances. By default, all VLANs belong to instance 0. You can run the instance 1 vlan 10 20 command to add VLAN 10 20 to instance 1.
Problem 1: Instance 0 and instance 1 are two different instances.
Problem 2: The purpose of VLAN division is to isolate different broadcast domains. Therefore, traffic of the same VLAN must pass through different switches. The VLAN must exist on both switches. If a VLAN does not exist, traffic cannot be forwarded, not to mention instances.
For example, VLAN 372 400 418 423 426 3591 exists on both the active and standby nodes. By default, VLAN 372 400 418 423 426 3591 is in instance 0. You can specify which VLANs are in which instances.
  • x
  • convention:

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