3Com SuperStack 4 Configuration Manual page 244

256 C 10: RSTP C
HAPTER
RSTP Configuration
Example
ONFIGURATION
Networking Requirements
In the following scenario, Switch C serves as a standby of Switch B and forwards
data when a fault occurs on Switch B. They are connected to each other with two
links, so that, in case one of the links fails, the other one can still work normally.
Switch D through Switch F are directly connected with the downstream user
computers and they are connected to Switch C and Switch B with uplink ports.
You can configure RSTP on the Switch B through Switch F to meet these
requirements.
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 same
way basically, so only the RSTP configuration on Switch D will be introduced.
Networking Diagram
Figure 65 RSTP Configuration Example
Configuration Procedure
1 Configure Switch A
a Enable RSTP globally.
[SW5500]stp enable
b The port RSTP defaults are enabled after global RSTP is enabled. You can
disable RSTP on those ports that are not involved in the RSTP calculation,
however, be careful and do not disable those involved. (The following
configuration takes GigabitEthernet 1/0/4 as an example.)
[SW5500]interface gigabitethernet 2/0/4
[SW5500-GigabitEthernet2/0/4]stp disable
c 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
[SW5500]stp priority 0
d Designate Switch A as the root, using the following command.
[SW5500]stp root primary
Switch A
GE2/0/1
E1/0/23 E1/0/23
Switch B
E1/0/24
E1/0/3
E1/0/1
E1/0/2
E1/1 E1/2 E1/1
Switch D Switch E
GE2/0/2
Switch C
E1/0/24
E1/0/1
E1/0/2 E1/0/3
E1/2
E1/2
E1/1
Switch F