S
PANNING
T
REE
C
OMMANDS
4-205
MST Configuration
Command Usage
The MST region name (page 4-204) 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 (4-204)
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
An MSTI region is treated as a single node by the STP and RSTP
protocols. Therefore, the message age for BPDUs inside an 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.
Console(config-mstp)#revision 1
Console(config-mstp)#
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