This attribute specifies the total number of TB forwarding table entries.
This includes static forwarding table entries and dynamic forwarding
table entries.
This attribute is influenced by the attribute tbFwdTableNumEntries,
which is a provisionable attribute.
If the value is consistently approaching the value of the attribute
tbFwdTableNumEntries, it is advisable to increase the value provisioned
for tbFwdTableNumEntries. It indicates a potential shortage of
forwarding table entries in the future.
This attribute is inversely proportional in value to the attribute
numFtEntriesFree.
This counter wraps around its maximum value of 4294967295.