Configuring The Mst Maximum-Hop Count - Cisco Nexus 9000 Series Configuration Manual

Configuring MST Using Cisco NX-OS
The maximum-aging timer is the number of seconds that a device waits without receiving spanning tree
configuration messages before attempting a reconfiguration.
Procedure
Step 1
Step 2
Step 3
Step 4
Step 5
This example shows how to configure the maximum-aging timer of the device to 40 seconds:
switch# config t
switch(config)# spanning-tree mst max-age 40
switch(config)# exit
switch#

Configuring the MST Maximum-Hop Count

You can configure the maximum hops inside the region and apply it to the IST and all MST instances in that
region. MST uses the path cost to the IST regional root and a hop-count mechanism similar to the IP time-to-live
(TTL) mechanism. The hop count achieves the same result as the message-age information (triggers a
reconfiguration).
Command or Action
config t
Example:
switch# config t
switch(config)#
spanning-tree mst max-age seconds
Example:
switch(config)# spanning-tree mst
max-age 40
exit
Example:
switch(config)# exit
switch#
show spanning-tree mst
Example:
switch# show spanning-tree mst
copy running-config startup-config
Example:
switch(config)# copy running-config
startup-config
Cisco Nexus 9000 Series NX-OS Layer 2 Switching Configuration Guide, Release 7.x
Configuring the MST Maximum-Hop Count
Purpose
Enters configuration mode.
Configures the maximum-aging time for all MST
instances. The maximum-aging time is the number
of seconds that a device waits without receiving
spanning tree configuration messages before
attempting a reconfiguration. For seconds, the range
is from 6 to 40, and the default is 20 seconds.
Exits configuration mode.
(Optional)
Displays the MST configuration.
(Optional)
Copies the running configuration to the startup
configuration.
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