DELL S50V User Manual
648
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Multiple Spanning Tree Protocol
www.dell.com | support.dell.com
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 29-6. 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.
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.
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.
information by recomputing the MST topology.
•
Max-hops is the maximum number of hops a BPDU can travel before a receiving switch discards it.
To change MSTP parameters, use the following commands on the root bridge:
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.
Poorly planned modification of MSTP parameters can negatively impact network performance.
Task
Command Syntax
Command Mode
Change the forward-delay parameter.
•
Range: 4 to 30
•
Default: 15 seconds
forward-delay
seconds
PROTOCOL MSTP
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