H3C S7500 Series Operation Manual page 257

Operation Manual – MSTP
H3C S7500 Series Ethernet Switches
Caution:
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
is not configurable.
During the selection of the root bridge, if multiple switches have the same bridge
priority, the one with the least MAC address becomes the root bridge.
II. Configuration example
# Set the bridge priority of the current switch to 4,096 in MSTI 1.
<H3C> system-view
[H3C] stp instance 1 priority 4096
1.2.5 MSTP Operation Mode Configuration
An MSTP-enabled switch can operate in one of the following operation modes:
STP-compatible mode: In this mode, the protocol packets sent out of the ports of
the switch are STP packets. If the switched network contains STP-enabled
switches, you can configure the current MSTP-enabled switch to operate in this
mode by using the stp mode stp command.
RSTP-compatible mode: In this mode, the protocol packets sent out of the ports of
the switch are RSTP packets. If the switched network contains RSTP-enabled
switches, you can configure the current MSTP-enabled switch to operate in this
mode by using the stp mode rstp command.
MSTP mode: In this mode, the protocol packets sent out of the ports of the switch
are MSTP packets, or STP packets if the ports have STP-enabled switches
connected. But the multiple spanning tree function is only enabled for MSTP
packets.
I. Configuration procedure
Follow these steps to configure MSTP operation mode:
To do ...
Enter system view
Configure the
MSTP operation
mode for the switch
Use the command ...
system-view
stp mode { stp | rstp |
mstp }
1-13
Chapter 1 MSTP Configuration
Remarks
—
Required
An MSTP-enabled switch
operates in the MSTP mode
by default.