CIST regional root bridge
Within an
MSTP (Multiple Spanning Tree Protocol) region, the bridge with the lowest path cost to the
CIST (Common and Internal Spanning Tree) root bridge is the CIST regional root bridge If the
CIST root bridge is inside an MSTP region, that same bridge is the CIST regional root for
that region because it has the lowest path cost to the CIST root. If the CIST root bridge is
outside an MSTP region, all regions connect to the CIST root through their respective CIST
regional roots.
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