The timeout period in seconds for aging out
dynamically learned forwarding information at
this VLAN. Setting this object value to zero
will disable the aging out action for this VLAN.
802.1D-1990 recommends a default of 300 seconds.
This object provides the same functionality as
dot1dTpAgingTime object in BRIDGE-MIB with one
exception that setting this object value to zero
will disable the aging out action for this VLAN.