Both switches, Core-1 and Core-2, are configured with default spanning-tree priorities. Both switches appear as primary root bridges. What must be done to have only one spanning tree domain?
If both switches are configured with default spanning-tree priorities and both appear as primary root bridges, to have a single spanning tree domain, matching MST configuration (Multiple Spanning Tree) must be created on Core-2 to align with Core-1.
Setting priority to 1 on one switch can help but matching MST configurations is the recommended approach for multiple VLANs.
Creating MST instances on only one switch will not ensure consistency.
[References:, , Aruba MSTP Configuration Guide, , IEEE 802.1s Multiple Spanning Tree Protocol, , HPE Aruba Network Design Best Practices]
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