PowerConnect B-Series FCX Configuration Guide 297
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802.1s Multiple Spanning Tree Protocol
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• PowerConnect B-Series FCX stackable switches – <stack-unit/slotnum/portnum>
When a port is disabled for MSTP, it behaves as blocking for all the VLAN traffic that is controlled by
MSTIs and the CIST.
Forcing ports to transmit an MSTP BPDU
To force a port to transmit an MSTP BPDU, use a command such as the following at the Global
Configuration level.
PowerConnect(config)#mstp force-migration-check ethernet 3/1
Syntax: [no] mstp force-migration-check ethernet <port>
The <port> variable specifies the port or ports from which you want to transmit an MSTP BPDU.
Specify the <port> variable in the following formats:
• PowerConnect B-Series FCX stackable switches – <stack-unit/slotnum/portnum>
Activating MSTP on a switch
MSTP scope must be enabled on the switch as described in “Configuring MSTP mode and scope”
on page 290 before MSTP can be enabled.
To enable MSTP on your switch, use the following at the Global Configuration level.
PowerConnect(config)#mstp start
Syntax: [no] mstp start
The [no] option disables MSTP from operating on a switch.
Example
In Figure 57 four Brocade device routers are configured in two regions. There are four VLANs in four
instances in Region 2. Region 1 is in the CIST.
