698 | Multiple Spanning Tree Protocol (MSTP)
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For a bridge to be in the same MSTP region as another, all three of these qualities must match exactly. The
default values for name and revision will match on all Dell Force10 FTOS equipment. If you have
non-FTOS equipment that will participate in MSTP, ensure these values to match on all the equipment.
To change the region name or revision:
View the current region name and revision using the command
show spanning-tree mst configuration from
EXEC Privilege mode, as shown in Figure 32-6.
Figure 32-6. Viewing the MSTP Region Name and Revision
Modify Global Parameters
The root bridge sets the values for forward-delay, hello-time, max-age, and max-hops and overwrites the
values set on other MSTP bridges.
• Forward-delay is the amount of time an interface waits in the Listening State and the Learning State
before it transitions to the Forwarding State.
• Hello-time is the time interval in which the bridge sends MSTP Bridge Protocol Data Units (BPDUs).
• Max-age is the length of time the bridge maintains configuration information before it refreshes that
information by recomputing the MST topology.
• Max-hops is the maximum number of hops a BPDU can travel before a receiving switch discards it.
Note: Some non-FTOS equipment may implement a non-null default region name. SFTOS, for example,
uses the Bridge ID, while others may use a MAC address.
Task Command Syntax Command Mode
Change the region name.
name name
PROTOCOL MSTP
Change the region revision number.
• Range: 0 to 65535
• Default: 0
revision number
PROTOCOL MSTP
Note: Dell Force10 recommends that only experienced network administrators change MSTP parameters.
Poorly planned modification of MSTP parameters can negatively impact network performance.
FTOS(conf-mstp)#name my-mstp-region
FTOS(conf-mstp)#exit
FTOS(conf)#do show spanning-tree mst config
MST region name: my-mstp-region
Revision: 0
MSTI VID
1 100
2 200-300
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