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Configuring RSTP 87
# Enable MSTP.
<3Com> system-view
[3Com] stp enable
# Enabling MSTP globally on the switch enables RSTP on all the ports. Disable
MSTP on the ports that are not involved in RSTP calculation, for example Ethernet
1/0/3.
[3Com] interface Ethernet 1/0/3
[3Com-Ethernet1/0/3] stp disable
# Configure the ports directly connected to users as edge ports and enable the
BPDU guard function on these ports. Take Ethernet 1/0/3 for example.
[3Com-Ethernet1/0/3] stp edged-port enable
[3Com-Ethernet1/0/3] quit
[3Com] stp bpdu-protection
# Adopt the default MSTP operation mode, time-related parameters, and port
parameters.
# The configuration on Switch E and Switch F are the same as that on Switch D.
Complete Configuration
1 Configuration on Switch A
#
stp instance 0 priority 0
(stp instance 0 root primary)
stp TC-protection enable
stp enable
#
interface GigabitEthernet2/0/1
stp root-protection
#
interface GigabitEthernet2/0/2
stp root-protection
#
interface GigabitEthernet2/0/4
stp disable
#
2 Configuration on Switch B
#
stp instance 0 priority 4096
stp enable
#
interface Ethernet1/0/4
stp root-protection
#
interface Ethernet1/0/5
stp root-protection
#
interface Ethernet1/0/6
stp root-protection
#