Configuring The Maximum-Aging Time; Configuring The Maximum-Hop Count; Configuring Pvst Simulation Globally - Cisco AP775A - Nexus Converged Network Switch 5010 Configuration Manual

Configuring the Maximum-Aging Time

Configuring the Maximum-Aging Time
The maximum-aging timer is the number of seconds that a switch waits without receiving spanning tree
configuration messages before attempting a reconfiguration.
You set the maximum-aging timer for all MST instances on the switch with one command (the maximum age
time only applies to the IST).
Procedure
Step 1
Step 2
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
Step 1
Step 2
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 5000 Series Switch CLI Software Configuration Guide
194
Command or Action
switch# configure terminal
switch(config)# spanning-tree
mst max-age seconds
Command or Action
switch# configure terminal
switch(config)# spanning-tree mst
max-hops 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
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.
Purpose
Enters configuration mode.
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 from 1 to 255, and
the default value is 20 hops.
Configuring MST
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