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Configuring RSTP 85
Configuration Procedure
1 Configuration on Switch A
# 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
GigabitEthernet 2/0/4.
[3Com] interface GigabitEthernet 2/0/4
[3Com-GigabitEthernet2/0/4] stp disable
# Configure Switch A as the root bridge in one of the following two methods:
■ Set the bridge priority of Switch A to 0.
[3Com] stp priority 0
■ Use the following command to specify Switch A as the root bridge.
[3Com] stp root primary
# Enable the root guard function on the designated ports connected to Switch B
and Switch C.
[3Com] interface GigabitEthernet 2/0/1
[3Com-GigabitEthernet2/0/1] stp root-protection
[3Com-GigabitEthernet2/0/1] quit
[3Com] interface GigabitEthernet 2/0/2
[3Com-GigabitEthernet2/0/2] stp root-protection
[3Com-GigabitEthernet2/0/2] quit
# Enable the TC-BPDU attack guard function on Switch A.
[3Com] stp tc-protection enable
2 Configuration on Switch B
# 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
1/0/8.
[3Com] interface Ethernet 1/0/8
[3Com-Ethernet1/0/8] stp disable
[3Com-Ethernet1/0/8] quit
Switch 4500 Release V03.03.00 All versions
Switch 4210 Release V03.01.00 All versions
Product series Software version Hardware version