1.SCACP> SHOW CHANNEL NODE20/LOCAL=EWA

      The command in this example displays channel definition data
      for all nodes defined with local device EWA and any remote
      device and remote node name starting with NODE20.

    2.SCACP> SHOW CHANNEL/COUNTERS/INTERVAL
      SCACP> SPAWN WAIT 0:0:10
      SCACP> SHOW CHANNEL/COUNTERS/INTERVAL

      The first command in this example displays channel counters
      since the last SHOW command. The SPAWN command tells the DCL
      WAIT command to insert a 10-second delay. The second SHOW
      CHANNEL command displays counters after the 10-second period.

    3.SCACP> SHOW CHANNEL/1/3

      The command in this example displays the first and third pages
      of data for all channels. The first page contains Channel
      Summary data, and the third page contains Channel Equivalent
      Channel Set (ECS) data.

    4.SCACP> SHOW CHANNEL/ALL

      The following is a snapshot of the output for SHOW CHANNEL/ALL
      command.

      Channel Error Data describes the channel error data.

      Table 1  Channel Error Data

      Data           Description

      Seq            Number of times a sequenced VC packet sent on
      Retransmit     this channel was retransmitted, and the channel
                     was penalized for the lost packet.
                     Note that the sequential retransmit is not
                     necessarily a reflection of lost packet. It
                     is possible that there can be a PE which could
                     have triggered a retransmitted and results in a
                     duplicate packet to be sent. This is reflected
                     in the number of duplicate packets received in
                     the remote node. The XMIT:REXMT ratio is also
                     a measure of for how many transmitted packet,
                     a packet was retransmitted. A very low value
                     (less than 1000) reflects a possible network
                     congestion.
      LAN Transmit   Number of times the local LAN device reported
      Failures       a failure to transmit a packet, and channel was
                     penalized for the lost packet.
      Restart        Close or restart because channel control packet
      Channel        received indicating that the other end closed
                     the channel and is restarting the channel
                     handshake.
      Channel Init   Channel initialization handshake timeout.
      Timeouts
      Listen         No packets of any kind, including HELLOs, were
      Timeouts       received in LISTEN_TIMEOUT seconds.
      Bad            Received a Channel Control (CC) packet with a
      Authorization  bad authorization field.
      Msg
      Bad ECO CC     Received a CC packet with an incompatible NISCA
      Msg            protocol ECO rev. field value.
      Bad            Received a bad multicast CC packet.
      Multicast
      Msg
      CC Short       Received a CC packet that was short.
      Packet
      CC             Received a CC packet that was incompatible with
      Incompatible   existing channels for this virtual circuit.
      Rcv Old        Received a packet from an old instance of a
      Channel        channel.
      No MSCP        No MSCP server available to respond to a
      Server         received channel control solicit service packet
                     asking this node to boot serve another node.
      Disk Not       Disk is not served by this system.
      Served
      Buffer Size    Change in buffer size.
      Change

    5.SCACP> SHOW CHANNEL/ECS

      The following is a snapshot of the output for SHOW CHANNEL/ECS
      command.

      ECS State Channel ECS Membership Information

      OpenVMS uses multiple interfaces to communicate with any other
      node in order to do load balancing of communication. However,
      at a given time not all interfaces that link the remote node
      are used to transmit datagrams. OpenVMS maintains a set of
      equivalent channels ECS (Equivalent Channel Set) within a VC.
      These channels have approximately equivalent transmission
      quality at a given time. Only the channels within the ECS
      are used to transmit datagrams to the given node. "A" is the
      generic format above may be "Y" (Yes) or "N" (No) stating
      whether the channel is in the ECS or not. The remaining
      characters specify the quality of the channel as they are
      derived from the channel performance data. The characters are:

      o  A: T or L for Tight or Lossy

      o  B: P, S, I, U for Peer, Superior, Inferior or Ungraded

      o  C: F or S for Fast or Slow

      For more details about ECS, see the section NISCA Transport
      Protocol Channel Selection and Congestion Control in the VSI
      OpenVMS Cluster Systems manual.

                                   NOTE

       From OpenVMS Version 8.3 onwards, Topology change column
       from SHOW CHANNEL/FULL or /5 has been removed. This is
       because you must not consider this as an 'error' instead
       it is the count of failovers from one interconnect to the
       other interconnect. Whenever failover occurs to another
       interconnect the buffer size changes. Hence this topology
       change is counted under "Buffer SizeDecr" column in SHOW
       VC/FULL output.

      You can view the IP channel data summary by using the
      /IPCHANNEL qualifier, for example:

        $ SHOW CHANNEL <nodename>/IPCHANNEL

      You can view the LAN channel data summary by using the
      /LANCHANNEL qualifier, for example:

        $ SHOW CHANNEL/LANCHANNEL