FibroLAN Falcon-RX/812/G/A User Manual page 185

Falcon R-Class | User Guide
4.15.1.2.1 Common and Internal Spanning Tree (CSTI):
CSTI is a collection of the IST in each region and the Common Spanning Tree (CST) which
interconnects the various MST regions and STP LANs, and RSTP LANs in a switched network.
The CIST is created as a result of the STP algorithm running between switches that support the
802.1w, and the 802.ID protocols. MSTP allows for rapid port state transition just like RSTP. MSTP is
compatible to STP and RSTP.
4.15.1.2.2 Example of a Multiple Spanning Tree Application
Assume we have tree switches in a region configured with VLANs grouped in two instances, as
follows:
VLAN1 (10, 20, 30) mapped to Instance 1; VLAN2 (11, 21, 31) mapped to Instance 2. The logical
topologies shown in the below drawing are the result from these VLAN/Instance grouping resulting
on different blocked links for different VLANs as shown.
The MSTP configuration commands operate exactly like RSTP commands and MSTP is compatible
with the RSTP and STP enable switches in our network.
MSTP Network
MSTP interconnects between various MST regions and maps active and separate paths through
separate spanning tree instances. The below drawing depicts an MSTP network MSTP distinguish an
STP or RSTP LAN as a distinct separate STP region.
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