Configuring the ECN330-switch
2331553-KDU 137 365 Uen D 2006-06-16
Spanning Tree (MST) for each instance to maintain connectivity among each of
the assigned VLAN groups. MSTP then builds a Internal Spanning Tree (IST) for
the Region containing all commonly configured MSTP bridges.
Figure 93 MSTP Region, Internal Spanning Tree, and Multiple Spanning Tree
An MST Region consists of a group of interconnected bridges that have the
same MST Configuration Identifiers (including Region Name, Revision Level
and Configuration Digest – see “Configuration Settings for MSTP” on page 241).
An MST Region may contain multiple MSTP Instances. An Internal Spanning
Tree (IST) is used to connect all the MSTP switches within an MST region. A
Common Spanning Tree (CST) interconnects all adjacent MST Regions, and
acts as a virtual bridge node for communications with STP or RSTP nodes in the
global network.
Figure 94 Common Internal Spanning Tree, Common Spanning Tree and
Internal Spanning Tree
Region R
IST
(for this Region)
MST 1
MST 2
Region 1
Region 4
Region 2 Region 3
CIST
IST
Region 1
Region 4
Region 2 Region 3
CST
To Next Page
Loading...
