The snapshot function saves the counters' values and displays
    those values. After the snapshot command is issued, the show
    command can be used to display a comparison of the current
    values and the registered values at later times.

    The following command activates snapshot for the entity and
    produces the snapshot output:

    NCL> snap nsp port nsp$port_0000200f all counters

    Snapshot node 0 NSP Port NSP$PORT_0000200F
    at 1994-09-18-19:49:11.76078 - 04:00 I 52.08425

    Counters
      Creation Time = 1991-09-18-18:55:25.59899 - 04:00 I 52.08425
      User Octets Received = 932
      User Octets Sent = 246
      User PDUs Received = 22
      User PDUs Sent = 10
      .
      .
      .

    The following show command displays the snapshot for the
    entity for which snapshot was activated:

    NCL> show nsp port nsp$port_0000200f all counters

    Show node 0 NSP Port NSP$PORT_0000200F
    at 1994-09-18-19:49:11.76078 - 04:00 I 52.08425

    Counters
      Creation Time = 1994-09-18-18:55:25.59899 - 04:00 I 52.08425

      Snapshot created at 1994-09-18-19:49:11.76078 - 04:00 I 52.08425

                        Actual Value    Snapshot Value    Difference
                        -------------   ---------------   ---------
  User Octets Received      2414           932            1482
  User Octets Sent          262            246              16
  User PDUs Received         25             22               3
  User PDUs Sent             11             10               1
  .                           .              .               .
  .                           .              .               .
  .                           .              .               .

    Snapshot information is only retained for the duration of an NCL
    session.  Therefore, the snapshot command and subsequent show
    commands must be issued at the NCL> prompt rather than at the
    DCL prompt.  To gather snapshot information from a remote node,
    you can either set the ncl default to the remote node entity or
    include the nodename in each ncl command, as long as the
    commands are issued within the same NCL session.