Enabling Stp Function (Required); Fig. 8.24 Cst And Ist Of Mstp (2) - SMC Networks 7824M/VSW - annexe 1 Manual

CLI
8.3.4
268
In CST, SWITCH A and B are operating with STP and SWITCH C, D and E are operating
with MSTP. First, in CST, CIST is established to decide a CST root. After the CST root is
decided, the closest switch to the CST root is decided as IST root of the region. Here,
CST root in IST is an IST root.
Legacy 802.1d
Switch A
Region C (IST)
Switch B
Switch D
Fig. 8.24 CST and IST of MSTP (2)
In the above situation, if SWITCH B operates with MSTP, it will send its BPDU to the CST
root and IST root in order to request itself to be a CST root. However, if any BPDU having
higher priority than that of SWITCH B is sent, SWITCH B cannot be a CST root.

Enabling STP Function (Required)

First of all, you need to enable STP function. You cannot configure any parameters re-
lated to Spanning Tree Protocol without this command.
To enable STP function on the switch, use the following command.
Command
spanning-tree
To disable STP function from the system, use the following command.
Command
no spanning-tree
CST Root & IST Root
IST Root
Instance 2
Instance 2
Instance 3
Mode
Bridge Enables STP function.
Mode
Bridge Disables STP function.
Management Guide
CST
Region B (IST)
Switch C
Instance 1
IST Root
Region A (IST)
Switch E
Description
Description
TigerAccess™ EE
SMC7824M/VSW