Luxul XMS-1024P - Manual (Page 95)

95
User Guide
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MSTP (Multiple Spanning Tree Protocol) is compatible with both STP and RSTP and
subject to the IEEE 802.1s standard. It not only enables Spanning Tree rapid convergence,
but also enables packets of different VLANs to be forwarded along their respective
paths to provide redundant links with a better Load-Balancing mechanism.
Features of MSTP:
„
MSTP combines VLANs and Spanning Tree together via the VLAN-to-Instance map-
ping table. It binds several VLANs to an instance to save communication cost and
Network resources.
„
MSTP divides a Spanning Tree Network into several regions. Each region has several
internal Spanning Trees, which are independent of each other.
„
MSTP provides a Load-Balancing mechanism for packet transmission in the VLAN.
„
MSTP is compatible with both STP and RSTP.
MSTP Elements
MST Region (Multiple Spanning Tree Region): An MST Region comprises Switches
with the same region confi guration and VLAN-to-Instance mapping relationships.
IST (Internal Spanning Tree): An IST is a Spanning Tree in an MST.
CST (Common Spanning Tree): A CST is the Spanning Tree in a Switched Network that
connects all MST Regions in the Network.
CIST (Common and Internal Spanning Tree): A CIST comprised of an IST and a CST, is
the Spanning Tree in a Switched Network that connects all Switches in the Network.
The following fi gure shows the Network diagram of an MSTP Topology.
Figure 7-2 Basic MSTP diagram