Which two values displayed in the output from the show spanning-tree MSTP configuration command must match on all switches participating in the same MSTP region? (Choose two)
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A. B. C. D.CD
The Multiple Spanning Tree Protocol (MSTP) is a Layer 2 protocol that helps to prevent network loops and provide redundancy. It allows multiple VLANs to share a common spanning tree, which reduces the number of spanning tree instances required in a network. When configuring MSTP, there are certain parameters that must match across all switches in the same MSTP region for proper functioning.
The "show spanning-tree mstp configuration" command is used to display the MSTP configuration information on a switch. The output of this command shows various parameters related to the MSTP configuration. Two of the values that must match across all switches participating in the same MSTP region are:
Root Bridge Identifier: This is the unique identifier of the switch that has been elected as the root bridge for the MSTP region. The root bridge is responsible for calculating the best path to forward frames across the network. All switches in the same MSTP region must agree on which switch is the root bridge, and the root bridge identifier value must match on all switches.
Configuration Digest: This is a value calculated based on the MSTP configuration information, including the VLAN-to-instance mapping, the instance-to-tree mapping, and the bridge priority values. All switches in the same MSTP region must have the same configuration digest value to ensure that they have the same MSTP configuration.
Therefore, the correct answers are A. root bridge identifier and D. configuration digest.