Purpose
Command or Action
Configures the maximum-aging time for all MST instances.
The maximum-aging time is the number of seconds that a
switch(config)#
spanning-tree
mst max-age seconds
Step 2
switch 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.
This example shows how to configure the maximum-aging timer of the switch to 40 seconds:
switch#
configure terminal
switch(config)#
spanning-tree mst max-age 40
Configuring the Maximum-Hop Count
MST uses the path cost to the IST regional root and a hop-count mechanism similar to the IP time-to-live
(TTL) mechanism. You configure the maximum hops inside the region and apply it to the IST and all MST
instances in that region. The hop count achieves the same result as the message-age information (triggers a
reconfiguration).
Procedure
Purpose
Command or Action
Enters global configuration mode.
switch#
configure terminal
Step 1
Specifies the number of hops in a region before the BPDU
is discarded, and the information held for a port is aged.
switch(config)#
spanning-tree mst
max-hops hop-count
Step 2
For
hop-count
, the range is from 1 to 255, and the default
value is 20 hops.
This example shows how to set the maximum hops to 40:
switch#
configure terminal
switch(config)#
spanning-tree mst max-hops 40
Configuring PVST Simulation Globally
You can block this automatic feature either globally or per port. You can enter the global command and change
the PVST simulation setting for the entire switch while you are in interface command mode.
Cisco Nexus 6000 Series NX-OS Layer 2 Switching Configuration Guide, Release 7.x
89
Configuring Multiple Spanning Tree
Configuring the Maximum-Hop Count
