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Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
OL-4266-08
Chapter 19 Configuring Standard-Compliant IEEE MST
Configuring MST
Configuring the Maximum-Aging Time
To configure the maximum-aging time for all MST instances, perform this task:
To return the router to its default setting, use the
no spanning-tree mst
max-age
global configuration
command.
Configuring the Maximum-Hop Count
To configure the maximum-hop count for all MST instances, perform this task:
To return the router to its default setting, use the
no spanning-tree mst
max-hops
global configuration
command.
Specifying the Link Type to Ensure Rapid Transitions
If you connect a port to another port through a point-to-point link and the local port becomes a
designated port, the RSTP negotiates a rapid transition with the other port by using the
proposal-agreement handshake to ensure a loop-free topology as described in the
“Rapid Convergence”
section on page 19-11
.
Command
Purpose
Step 1
Router#
configure terminal
Enters global configuration mode.
Step 2
Router(config)#
spanning-tree mst max-age
seconds
(Optional) Configures the maximum-aging time for all
MST instances. The maximum-aging time is the number
of seconds a router waits without receiving spanning-tree
configuration messages before attempting a
reconfiguration.
For
seconds
, the range is 6 to 40; the default is 20.
Step 3
Router(config)#
end
Returns to privileged EXEC mode.
Step 4
Router#
show spanning-tree mst
Verifies your entries.
Step 5
Router#
copy running-config startup-config
(Optional) Saves your entries in the configuration file.
Command
Purpose
Step 1
Router#
configure terminal
Enters global configuration mode.
Step 2
Router(config)#
spanning-tree mst max-hops
hop_count
(Optional) Specifies the number of hops in a region
before the BPDU is discarded, and the information held
for a port is aged.
For
hop_count
, the range is 1 to 255; the default is 20.
Step 3
Router(config)#
end
Returns to privileged EXEC mode.
Step 4
Router#
show spanning-tree mst
Verifies your entries.
Step 5
Router#
copy running-config startup-config
(Optional) Saves your entries in the configuration file.
