Dell Networking OS equipment that participates in MSTP, ensure these values match on all the
equipment.
NOTE: Some non-Dell Networking OS equipment may implement a non-null default region name.
SFTOS, for example, uses the Bridge ID, while others may use a MAC address.
Changing the Region Name or Revision
To change the region name or revision, use the following commands.
•
Change the region name.
PROTOCOL MSTP mode
name name
•
Change the region revision number.
PROTOCOL MSTP mode
revision number
Example of the name Command
To view the current region name and revision, use the show spanning-tree mst configuration
command from EXEC Privilege mode.
Dell(conf-mstp)#name my-mstp-region
Dell(conf-mstp)#exit
Dell(conf)#do show spanning-tree mst config
MST region name: my-mstp-region
Revision: 0
MSTI
VID
1
100
2
200-300
Modifying 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 — the amount of time an interface waits in the Listening state and the Learning state
before it transitions to the Forwarding state.
•
Hello-time — the time interval in which the bridge sends MSTP bridge protocol data units (BPDUs).
•
Max-age — the length of time the bridge maintains configuration information before it refreshes that
information by recomputing the MST topology.
•
Max-hops — the maximum number of hops a BPDU can travel before a receiving switch discards it.
NOTE: Dell Networking recommends that only experienced network administrators change MSTP
parameters. Poorly planned modification of MSTP parameters can negatively affect network
performance.
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Multiple Spanning Tree Protocol (MSTP)