Configuring Stp/Rstp/Mstp/Pvstp/Pvrstp Mode (Required); Fig. 8.23 Cst And Ist Of Mstp (2) - Siemens S223 User Manual

User Manual
SURPASS hiD 6615 S223/S323 R1.5
8.3.4
A50010-Y3-C150-2-7619
In CST, A and B are the switches operating with STP and C, D and, E are those operating
with MSTP. First, in CST, CIST is established to decide CST Root. After CST root is de-
cided, the closest switch to CST root is decided as IST root of the region. Here, CST root
in IST is IST root.
Legacy 802.1d
Switch A
Region C (IST)
Switch B
Switch D
CST and IST of MSTP (2)
Fig. 8.23
In above situation, if B operates with MSTP, B will send it's BPDU to CST root and IST
root in order to request itself to be CST root. However, if any BPDU having higher priority
than that of B is sent, B cannot be CST root.
For the hiD 6615 S223/S323, the commands configuring MSTP are also used to config-
ure STP and RSTP.

Configuring STP/RSTP/MSTP/PVSTP/PVRSTP Mode (Required)

First of all, you need to configure force-version to decide the mode before STP is config-
ured. To decide force-version of the switch, use the following command.
Command
stp force-version { stp | rstp |
mstp | pvstp | pvrstp }
To delete STP configuration from the switch, use the following command.
Command
no stp force-version
CST Root & IST Root
IST Root
Instance 2
Instance 2
Instance 3
Mode
Bridge Configures Force-version in the bridge.
Mode
Bridge Removes force-version configuration.
CST
Region B (IST)
Switch C
Instance 1
IST Root
Region A (IST)
Switch E
Description
Description
UMN:CLI
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