Accton Technology ES4626 - Manual (Page 236)

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Usage Guide: According to MSTP , when topology changes, the port that send change
message clears MAC/ARP table (FLUSH). In fact it is not needed for some network
environment to do FLUSH with every topology change. At the same time ,as a method to
avoid network assault, we allow the network administrator to configure FLUSH mode by
the command
Note:For the complicated network, especially need to switch from one spanning tree
branch to another rapidly, the disable mode is not recommended.
Example:
Switch(Config)#interface ethernet 1/2
Switch(Config-Ethernet-1/2)#spanning-tree tcflush disable
Switch(Config-Ethernet-1/2)#
7.4 MSTP Example
The following is a typical MSTP application scenario:
Fig 7-2 Typical MSTP Application Scenario
The connections among the switches are shown in the above figure. All the switches
run in the MSTP mode by default, their bridge priority, port priority and port route cost are
all in the default values (equal). The default configuration for switches is listed below:
Bridge Name SwitchA SwitchB SwitchC SwitchD
Bridge MAC
Address
…00-00-01 …00-00-02 …00-00-03 …00-00-04
Bridge Priority 32768 32768 32768 32768
P ri Port 1
128 128 128
SwitchB SwitchC
SwitchD
1
1
2
2
3 5 4
2
3
1
6 7
5
4 6 7
x
x x
x
x
SwitchA