Chapter 4 - Multiple Spanning Tree Protocol

Question 1

Common Spanning Tree (CST)

Answer 1

A single spanning-tree instance for the entire network, as defined in the 802.1D standard.

Question 2

internal spanning tree (IST)

Answer 2

The first MSTI in the MST protocol. The IST is responsible for building a CST across all VLANs, regardless of their VLAN membership. The IST contains advertisements for other MSTIs in its BPDUs.

Question 3

MST instance (MSTI)

Answer 3

A single spanning-tree instance for a specified set of VLANs in the MST protocol.

Question 4

MST region

Answer 4

A collection of MSTIs that operate in the same MST domain.

Question 5

MST region boundary

Answer 5

Any switch port that connects to another switch in a different MST region or that connects to a traditional 802.1D or 802.1W STP instance.

Question 6

PVST simulation check

Answer 6

The process of ensuring that the MST region is the STP root bridge for all the VLANs or none of the VLANs. If the MST region is a partial STP root bridge, the port is shut down.