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CHAPTER 4: MULTIPLE SPANNING-TREE (Spanning-Tree Modes (CST : (IEEE 802…
CHAPTER 4:
MULTIPLE SPANNING-TREE
Spanning-Tree Modes
CST :
IEEE 802.1D
PVST
Cisco-proprietary
:star: MST
IEEE 802.1s
MST Instances (MSTIs)
:!: Instance 0
Internal Spanning-Tree (CIST)
Supports up to 16 instances
MST Region
:check: Same MST version number
:check: Same MST name
:check:Same VLAN-to-instance mapping
Misconfigurations
:no_entry: VLAN Assignment to the IST
:no_entry: Trunk link prunning
MST Region Boundary
PVST+ Simulation Mechanism
Transmits one BPDU per VLAN based on IST
Maps PVST+ VLAN 1 BPDU to IST
MST Region as the Root Bridge
:smiley: Allows load balancing
MST Region NOT as Root Bridge
:warning: A port block or forwards for ALL the VLANs