sh mpls ldp bindings

R1#sh mpls ldp bindings
  tib entry: 10.10.10.1/32, rev 4
        local binding: tag: imp-null
  tib entry: 10.10.10.2/32, rev 12
        local binding: tag: 16
  tib entry: 10.10.10.3/32, rev 16
        local binding: tag: 18
  tib entry: 100.10.10.0/24, rev 6
        local binding: tag: imp-null
  tib entry: 100.10.20.0/24, rev 8
        local binding: tag: imp-null
  tib entry: 100.10.30.0/24, rev 10
        local binding: tag: imp-null
  tib entry: 192.168.10.0/30, rev 2
        local binding: tag: imp-null
  tib entry: 192.168.10.4/30, rev 14
        local binding: tag: 17

what does the bold letters mean ??
Received on Thu Nov 05 2009 - 06:01:21 ART