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Configuration example
# Configure the current switch as the root bridge of MSTI 1 and a secondary root bridge of MSTI 2.
<Sysname> system-view
[Sysname] stp instance 1 root primary
[Sysname] stp instance 2 root secondary
Configuring the Bridge Priority of the Current Switch
Root bridges are selected according to the bridge priorities of switches. You can make a specific switch
be selected as a root bridge by setting a lower bridge priority for the switch. An MSTP-enabled switch
can have different bridge priorities in different MSTIs.
Configuration procedure
Follow these steps to configure the bridge priority of the current switch:
To do... Use the command... Remarks
Enter system view
system-view
—
Set the bridge priority for the
current switch
stp [ instance instance-id ]
priority priority
Required
The default bridge priority of a
switch is 32,768.
z Once you specify a switch as the root bridge or a secondary root bridge by using the stp root
primary or stp root secondary command, the bridge priority of the switch cannot be configured
any more.
z During the selection of the root bridge, if multiple switches have the same bridge priority, the one
with the smallest MAC address becomes the root bridge.
Configuration example
# Set the bridge priority of the current switch to 4,096 in MSTI 1.
<Sysname> system-view
[Sysname] stp instance 1 priority 4096
Configuring How a Port Recognizes and Sends MSTP Packets
A port can be configured to recognize and send MSTP packets in the following modes.
z Automatic mode. Ports in this mode determine the format of the MSTP packets to be sent
according to the format of the received packets.
z Legacy mode. Ports in this mode recognize/send packets in legacy format.
z 802.1s mode. Ports in this mode recognize/send packets in dot1s format.
A port acts as follows according to the format of MSTP packets forwarded by a peer switch or router.
When a port operates in the automatic mode:
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