Configuration Examples
445
M4100 Series Managed Switch
3. From the STP Configuration screen, enable the Spanning Tree State option.
See Spanning Tree Protocol Overview on page 145.
4. Use the default values for the rest of the STP configuration settings.
By default, the STP Operation Mode is MSTP and the configuration name is the switch
MAC address.
5. From the CST Configuration screen, set the Bridge Priority value for each of the three
switches to force Switch 1 to be the root bridge:
• Switch 1: 4096
• Switch 2: 12288
• Switch 3: 20480
Note: Bridge priority values are multiples of 4096.
If you do not specify a root bridge and all switches use the same Bridge Priority value, the
switch with the lowest MAC address is elected as the root bridge (see
Configure
Common Spanning Tree on page 150).
6. From the CST Port Configuration screen, select ports 1/0/1 - 1/0/8 and select Enable from
the STP Status menu.
See Configure Common Spanning Tree on page 150.
7. Click the APPLY button.
8. Select ports 1/0/1–1/0/5 (edge ports), and select Enable from the Fast Link menu.
Since the edge ports are not at risk for network loops, ports with Fast Link enabled
transition directly to the forwarding state.
9. Click the APPLY button.
You can use the CST Port Status screen to view spanning tree information about each
port.
10. From the MST Configuration screen, create an MST instances with the following settings:
• MST ID: 1
• Priority: Use the default (32768)
• VLAN ID: 300
For more information, see Configure an MST Instance on page 156.
11. Click the ADD button.
12. Create a second MST instance with the following settings:
• MST ID: 2
• Priority: 49152
• VLAN ID: 500
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