Thanks a lot for your advice.
Fortunately I have only one port in blocked state, so it will be easy.
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Original Message:
Sent: Feb 13, 2026 04:11 AM
From: sysnaz
Subject: Impact of changing stp region-configuration ?
There's a way I don't remember to change the MSTP configuration. Network interventions are always at risk of human error.
That said, you have a certain number of links in your network that are blocked by the spanning tree.
You could manually shut down the interface at one side of these links, thus obtaining a loop-free network. You can then stop the spanning tree on each switch.
It would be best if loop protection were used on the distribution switches.
Then, starting from the root switch, one switch at a time, you can change the configuration as desired and activate the spanning tree.
At this point, you have a loop-free network with the new configuration, but with some links are still manually shut down.
The last step is to reactivate the previously shut down interfaces.
The expected result is to have those links up again, but blocked by the intervention of the spanning tree.
Original Message:
Sent: Feb 11, 2026 11:10 AM
From: Erik91
Subject: Impact of changing stp region-configuration ?
Hello,
I have a layer 2 network with 20 Comware 5900AF serie configured with STP.
On the Core Switch I have the below configuration :
#
stp region-configuration
region-name Toto
revision-level 1
instance 1 vlan 1 to 4094
active region-configuration
#
stp instance 0 to 2 root primary
stp bpdu-protection
stp global enable
#
*********************
On others Switches I have :
#
stp region-configuration
region-name Toto
revision-level 1
instance 1 vlan 1 to 4094
active region-configuration
#
stp bpdu-protection
stp global enable
#
The Layer 2 network use only Vlan numbers between 1 and 100
I would like to know the impact if I change on all Switches the configuration from " instance 1 vlan 1 to 4094" to "instance 1 vlan 1 to 4040" ?
As it will take a moment to reconfigure all the switches, during few minutes the configuration will not be the same on all switches and I assume this may have an impact.
Thanks in advance for your support.
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