Configure The Mstp Running Mode; Configure The Bridge Priority For A Switch - Huawei Quidway S3000 Series Operation Manual

Operation Manual - STP
Quidway S3000 Series Ethernet Switches
You can configure more than one secondary root for a spanning tree through specifying the secondary STI
root on two or more switches.
Generally, you are recommended to designate one primary root and more than one secondary roots for a
spanning tree.
By default, a switch is neither the primary root or the secondary root of the spanning
tree.

2.2.3 Configure the MSTP Running Mode

MSTP and RSTP are compatible and they can recognize the packets of each other.
However, STP cannot recognize MSTP packets. To implement the compatibility, MSTP
provides two operation modes, STP-compatible mode and MSTP mode. In
STP-compatible mode, the switch sends STP packets via every port and serves as a
region itself. In MSTP mode, the switch ports send MSTP or STP packets (when
connected to the STP switch) and the switch provides multiple spanning tree function.
You can use the following command to configure MSTP running mode. MSTP can
intercommunicate with STP. If there is STP switch in the switching network, you may
use the command to configure the current MSTP to run in STP-compatible mode,
otherwise, configure it to run in MSTP mode.
Perform the following configuration in system view.
Table2-5 Configure the MSTP running mode
Configure MSTP to run in STP-compatible mode
Configure MSTP to run in MSTP mode.
Restore the default MSTP running mode
Generally, if there is STP switch on the switching network, the port connected to it will
automatically transit from MSTP mode to STP-compatible mode. But the port cannot
automatically transit back to MSTP mode after the STP switch is removed.
By default, MSTP runs in MSTP mode.

2.2.4 Configure the Bridge Priority for a Switch

Whether a switch can be elected as the spanning tree root depends on its Bridge
priority. The switch configured with a smaller Bridge priority is more likely to become the
root. An MSTP switch may have different priorities in different STIs.
Operation
2-14
Chapter 1 RSTP Configuration
Command
stp mode stp
stp mode mstp
undo stp mode