3Com 7700 Configuration Manual page 220

212 C 8: STP O
HAPTER PERATION
Perform the following configurations in system view.
Table 3 Setting the Diameter of a Switching Network
Operation
Set diameter of a switching
network
Restore a default diameter of the
switching network
The diameter of the switching network should not exceed 7. Users can configure
this parameter according to the actual networking.
By default, the parameter is configured to 7.
Configuring RSTP Operating Mode
RSTP is executable in RSTP mode or STP-compatible mode. RSTP mode is applied
when all the network devices provided for executing RSTP. STP-compatible mode is
applied when both STP and RSTP are executable on the network.
You can use the following command to set the RSTP operating mode.
Perform the following configurations in system view.
Table 4 Setting RSTP Operating Mode
Operation
Configure RSTP in
STP-compatible/RSTP mode
Restore the default RSTP mode
Normally, if there is a bridge provided to execute STP in the switching network, the
port (in the switch running RSTP), which connects to another port (in the switch
for executing STP), can automatically switch to STP compatible mode from RSTP
mode.
By default, RSTP runs in RSTP mode.
Setting the Priority of a Specified Bridge
Whether a bridge can be selected as the root of the spanning tree depends on its
priority. By assigning a lower priority, a bridge can be artificially specified as the
root of the spanning tree.
Perform the following configurations in system view.
Table 5 Setting the Priority of a Bridge
Operation
Set priority of a specified bridge
Restore the default priority of
specified bridge
Note that if the priorities of all the bridges in the switching network are the same,
the bridge with the smallest MAC address will be selected as the root. When RSTP
Command
stp bridge-diameter bridgenum
undo stp bridge-diameter
Command
stp mode { stp | rstp }
undo stp mode
Command
stp priority bridge-priority
undo stp priority