Siemens S323 User Manual
User Manual UMN:CLI
SURPASS hiD 6615 S223/S323 R1.5
SURPASS hiD 6615 S223/S323 R1.5
A50010-Y3-C150-2-7619 211
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.
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
CST Root & IST Root
Switch A
Switch D
Switch C
Switch E
Instance 2
Instance 3
Instance 2
Instance 1
Region B (IST)
IST Root
CST
Switch B
IST Root
Region A (IST)
Region C (IST)
Fig. 8.23
CST and IST of MSTP (2)
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.
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.
ure STP and RSTP.
8.3.4 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.
ured. To decide force-version of the switch, use the following command.
Command Mode
Description
stp force-version
{stp | rstp |
mstp
| pvstp | pvrstp}
Bridge
Configures Force-version in the bridge.
To delete STP configuration from the switch, use the following command.
Command Mode
Description
no stp force-version
Bridge
Removes force-version configuration.