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APRIL 2008
MSTP INTEROPERABILITY OF THE DELL™ POWERCONNECT™ 6200 SERIES SWITCHES
WITH CISCO IOS AND CISCO CATOS-BASED SWITCHES
SAMPLE SETUP AND CONFIGURATIONS
This section contains the CLI commands you would use to configure MSTP on the switches in
Figure 6 where two bridges are Dell PowerConnect switches, and the third bridge is a Cisco
Catalyst switch.
The three switches in the figure are as follows:
• BrA: Dell PowerConnect 6248
• BrB: Dell PowerConnect 6248
• BrC: CiscoCatalyst3750series
BrA is the root bridge for MSTP instance 1, and BrC is the root bridge for MSTP instance 2.
CONFIGURING BRIDGE BrA (CLI)
Use the commands in this section to configure the Dell PowerConnect 6248 as bridge BrA as
shown in Figure 6.
Dell_BrA(config)#vlan database
Dell_BrA(config-vlan)#vlan 10,20
Dell_BrA(config-vlan)#exit
Dell_BrA(config)#interface ethernet 1/g1
Dell_BrA(config-if-1/g1)#switchport mode trunk
Dell_BrA(config-if-1/g1)#switchport trunk allowed vlan add 10,20
Dell_BrA(config-if-1/g1)#switchport trunk allowed vlan remove 1
Dell_BrA(config-if-1/g1)#exit
Dell_BrA(config)#interface ethernet 1/g2
Dell_BrA(config-if-1/g1)#switchport mode trunk
Dell_BrA(config-if-1/g1)#switchport trunk allowed vlan add 10,20
Dell_BrA(config-if-1/g1)#switchport trunk allowed vlan remove 1
Dell_BrA(config-if-1/g1)#exit
Dell_BrA(config)#spanning-tree mode mstp
Dell_BrA(config)#spanning-tree mst 1 priority 0
Dell_BrA(config)#spanning-tree mst configuration
Dell_BrA(config-mst)#name Dell
Dell_BrA(config-mst)#instance 1 add vlan 10
Dell_BrA(config-mst)#instance 2 add vlan 20
Dell_BrA(config-mst)#exit
Command Description
vlan database
Enter VLAN command mode
vlan 10, 20
Create VLANs 10 and 20
exit
Exit to configuration mode
interface Ethernet 1/g1
Enter interface configuration mode for the
Ethernet interface on slot 1, port 1
switchport mode trunk
Configure the VLAN membership mode
for the port as a trunk (a trunk port
connects two switches)
switchport trunk allowed
vlan add 10, 20
Add VLANs 10 and 20 to the trunk port
switchport trunk allowed
vlan remove 1
Remove VLAN 1 (the default VLAN) from
the trunk port