Chapter 17
| Spanning Tree Commands
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Command Usage
This command limits the maximum transmission rate for BPDUs.
Example
Console(config)#spanning-tree transmission-limit 4
Console(config)#
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.
Example
Console(config-mstp)#max-hops 30
Console(config-mstp)#
mst priority This command configures the priority of a spanning tree instance. Use the no form
to restore the default.
Syntax
mst instance-id priority priority
no mst instance-id priority
instance-id - Instance identifier of the spanning tree. (Range: 0-4094)
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