This is the interval (in seconds) after which a learnt router port entry will be purged. For each router port learnt, this timer runs for 'RouterPortPurgeInterval' seconds.When the timer expires, the learnt router port entry is purged. However if control messages are received from the router before the timer expiry, then the timer is restarted. This object is deprecated and corresponding functionality is met using the objects in fsSnoopRtrPortTable. If configured, this value overrides the value used in fsSnoopRtrPortTable.