Configuring The Bridge Priority Of The Current Switch; Configuring How A Port Recognizes And Sends Mstp Packets - 3Com 4200G 12-Port Configuration Manual

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...
Enter system view
Set the bridge priority for the
current switch
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.
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.
Automatic mode. Ports in this mode determine the format of the MSTP packets to be sent
according to the format of the received packets.
Legacy mode. Ports in this mode recognize/send packets in legacy format.
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:
Use the command...
system-view
stp [ instance instance-id ]
priority priority
1-19
Remarks
—
Required
The default bridge priority of a
switch is 32,768.