EnGenius EWS5912FP, Руководство пользователя

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CIST Instance Settings
The Common Instance Spanning Tree (CIST) protocol is
formed by the spanning-tree algorithm running among
bridges that support the IEEE 802.1w, IEEE 802.1s, and
IEEE 802.1D standard. A Common and Internal Spanning
Tree (CIST) represents the connectivity of the entire
network and it is equivalent to a spanning tree in an
STP/RSTP.
The CIST inside a Multiple Spanning Tree Instance
(MST) region is the same as the CST outside a region.
All regions are bound together using a CIST, which
is responsible for creating loop-free topology across
regions, whereas the MSTI controls topology inside
regions. CST instances allow different regions to
communicate between themselves. CST is also used
for traffic within the region for any VLANs not covered
by a MSTI. In an MSTP-enabled network, there is only
one CIST that runs between MST regions and single
spanning tree devices. A network may contain multiple
MST regions and other network segments running
RSTP. Multiple regions and other STP bridges are
interconnected using a single CST.