3Com 7700 Configuration Manual page 228

220 C 8: STP O
HAPTER PERATION
Figure 4 RSTP Configuration Example
GE1/0/1
GE1/M
E0/23 E0/23
E0/24
Switch B
E0/3
E0/2
E0/1
E1/1 E1/1
E2/1
Switch D Switch E
Only the configurations related to RSTP are listed in the following procedure.
Switch A serves as the root. Switch D through Switch F are configured in basically
the same way so only the RSTP configuration on Switch D is introduced.
Configure Switch A:
1 Enable RSTP globally.
[SW7700] stp enable
2 The port RSTP defaults are enabled after global RSTP is enabled. You can disable
RSTP on those ports that are not involved in RSTP calculation, however, be careful
and do not disable those involved. (The following configuration takes
GigabitEthernet 1/0/4 as an example.)
[SW7700] interface gigabitethernet 1/0/4
[SW7700-GigabitEthernet1/0/4] stp disable
3 To configure Switch A as a root, you can either configure the Bridge priority of it as
0 or simply use the command to specify it as the root.
Set the Bridge priority of Switch A to 0
[SW7700] stp priority 0
Designate Switch A as the root, using the following command.
[SW7700] stp root primary
4 Enable the Root protection function on every designated port.
[SW7700] interface Gigabitethernet 1/0/1
[SW7700-GigabitEthernet1/0/1] stp root-protection
[SW7700] interface Gigabitethernet 1/0/2
[SW7700-GigabitEthernet1/0/2] stp root-protection
Configure Switch B
1 Enable RSTP globally.
[SW7700] stp enable
2 The port RSTP defaults are enabled after global RSTP is enabled. You can disable
RSTP on those ports that are not involved in RSTP calculation, however, be careful
Switch A
GE1/0/2
GE1/M
Switch C
E0/24
E0/1
E0/3
E0/2
E2/1
E2/1
E1/1
Switch F