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MSTP with multple loops

MSTP with multple loops

MSTP with multple loops
MSTP with multple loops
2024-07-05 14:40:13 - last edited 2024-07-12 01:29:20
Model: TL-SG3452XP  
Hardware Version: V2
Firmware Version: 2.20.1 Build 20231115 Rel.68992

Hello, I Have 8 switches I have to configure on 4 different locations in the building. Every location gets 2 switches that are connected with SFP+ DAC cables.

Connections between locations are with single mode fiber connections SFP+

 

In the serverroom are switches SW15 & SW16 and they connect to 3 other switch pairs in the building (SW17&SW18, SW19&SW20 and SW21&SW22) as shown in the pictue:

All switches are running instance 1 with vlan1-2 and instance 2 with vlan 3-4.

 

 

What I would like to achieve is to use MSTP on all 3 switch loops, but I am struggeling to get this working and I know that I cannot to this by just changing path cost.

 

I can really use some help to guide me in the right direction.

 

Thanks, Kim

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Re:MSTP with multple loops-Solution
2024-07-09 15:14:59 - last edited 2024-07-12 01:29:20

  @kshesq I did work by setting root instances (I have two) on two instead of one switch.

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Re:MSTP with multple loops
2024-07-08 03:08:14 - last edited 2024-07-08 09:28:32

Hi @kshesq 

Thanks for posting in our business forum.

Not sure what mode you use, but should be configured like the guides below.

How to configure MSTP on L2 Managed switches using the new GUI

Spanning Tree Configuration in Omada SDN Controller Mode

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Re:MSTP with multple loops
2024-07-08 07:52:10

  @Clive_A well that setup is what I use. For all switches I use 2 routes 2000 and 300000 but on disconnecting the lower cost path I loose the network connection.

 

The above setup works on 1 loop, but not on multiple loops. I suspect that the root switch senses that there are other 2000 cost path routes left and does not use the 300000 route.

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Re:MSTP with multple loops-Solution
2024-07-09 15:14:59 - last edited 2024-07-12 01:29:20

  @kshesq I did work by setting root instances (I have two) on two instead of one switch.

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