EnGenius EGS7228P User Manual download pdf (Page 51)

MST Instance Settings

Multiple Spanning Tree Protocol, or MSTP enables the

grouping of multiple VLANs with the same topology

requirements into one Multiple Spanning Tree Instance

(MSTI). MSTP then builds an Internal Spanning Tree

(IST)fortheregioncontainingcommonlycongured

MSTP bridges. Instances are not supported in STP or

RSTP. Instead, they have the same spanning tree in

common within the VLAN. MSTP provides the capability

to logically divide a Layer 2 network into regions. Every

region can contain multiple instances of spanning trees.

In MSTP, all of the interconnected bridges that have the

sameMSTPcongurationcompriseanMSTregion.

A Common Spanning Tree (CST) interconnects all

adjacentMSTRegionsandactsasavirtualbridgenode

for communications between STP or RSTP nodes in

the global network. MSTP connects all bridges and LAN

segments with a single Common and Internal Spanning

Tree (CIST). The CIST is formed as a result of the running

spanning tree algorithm between Switches that support

STP, RSTP, and MSTP protocols. Once you specify the

VLANs you wish to include in a Multiple Spanning Tree

Instance (MSTI), the protocol will automatically build an

MSTI tree to maintain connectivity among each of the

VLANs. MSTP maintains contact with the global network

because each instance is treated as an RSTP node in the

Common Spanning Tree (CST).

ClicktheEditbuttontoconguretheMSTsettings.Next,

enter information for the VLAN List and choose the

priority you wish to use from the drop-down list.

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EnGenius EGS7228P User Manual Page 51