Gigabit Ethernet Switch Management Guide

S PANNING T REE C OMMANDS
4-218
Example
Related Commands
name (4 -216)
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)#