Version 7.5.1.0 Introduced on the C-Series.
Version 6.2.1.1 Introduced.
Related 
Commands
vlan bridge-priority – sets the bridge-priority value.
vlan forward-delay – changes the time interval before FTOS transitions to the forwarding state.
vlan max-age – changes the time interval before PVST+ refreshes.
show spanning-tree pvst – displays the PVST+ configuration.
vlan max-age
Set the time interval for the PVST+ bridge to maintain configuration information before refreshing that information.
C-Series, E-Series, S-Series, Z-Series, S4810
Syntax
vlan vlan-range max-age seconds
To return to the default, use the no vlan max-age command.
Parameters
vlan 
vlan-range
Enter the keyword vlan followed by the VLAN number(s). The range 
is 1 to 4094.
max-age 
seconds
Enter the keywords max-age followed by the time interval, in 
seconds, that FTOS waits before refreshing configuration information. 
The range is 6 to 40 seconds. The default is 20 seconds.
Defaults 20 seconds
Command Modes CONFIGURATION (conf-pvst)
Command History
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
Version 7.6.1.0 Introduced on the S-Series.
Version 7.5.1.0 Introduced on the C-Series.
Version 6.2.1.1 Introduced.
Related 
Commands
vlan bridge-priority – sets the bridge-priority value.
vlan forward-delay – changes the time interval before FTOS transitions to the forwarding state.
vlan hello-time – changes the time interval between BPDUs.
show spanning-tree pvst – displays the PVST+ configuration.
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