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Command Line Interface
4-170
4
Command Mode
MST Configuration
Command Usage
The MST region name (page 4-169) and revision number are used to
designate a unique MST region. A bridge (i.e., spanning-tree compliant device
such as this switch) can only belong to one MST region. And all bridges in the
same region must be configured with the same MST instances.
Example
Related Commands
name (4-169)
max-hops
This command configures the maximum number of hops in the region before a
BPDU is discarded. Use the no form to restore the default.
Syntax
max-hops hop-number
hop-number - Maximum hop number for multiple spanning tree.
(Range: 1-40)
Default Setting
20
Command Mode
MST Configuration
Command Usage
A MSTI region is treated as a single node by the STP and RSTP protocols.
Therefore, the message age for BPDUs inside a MSTI region is never
changed. However, each spanning tree instance within a region, and the
internal spanning tree (IST) that connects these instances use a hop count to
specify the maximum number of bridges that will propagate a BPDU. Each
bridge decrements the hop count by one before passing on the BPDU. When
the hop count reaches zero, the message is dropped.
Example
Console(config-mstp)#revision 1
Console(config-mstp)#
Console(config-mstp)#max-hops 30
Console(config-mstp)#