APPN Set Tuning

The following are node tuning characteristics:

  1. The tuning parameter settings should reflect anticipated growth in your network.
  2. If you define connection networks within your APPN network and you anticipate that most end nodes will initiate LU-LU sessions with other end nodes on the same connection network, you should set the maximum number ISR sessions parameter to a smaller value (1). Using connection networks in this manner reduces the shared memory requirements for the router network node because most LU-LU sessions will not flow through the APPN component in the router.
  3. Because the maximum shared memory parameter affects storage allocation within the router, you should use care when explicitly defining this parameter. Use the defaults as a guide when increasing or reducing maximum shared memory manually.

This option allows you to configure APPN node tuning parameters.

Answer the following questions:

  1. Maximum number of adjacent nodes

    This parameter is an estimate of the maximum number of nodes that you expect to be logically adjacent to this router network node at any one time.

    This parameter is used along with the Maximum number of ISR sessions parameter by the automatic tuning algorithm to calculate the values for the Maximum shared memory and Maximum cached directory entries tuning parameters.

    Valid Values: 1 to 2800

    Default Value: 100

  2. Maximum number of network nodes sharing the same APPN network id

    Default Value:

    Valid Values: 10 to 8000

    Default Value: 50

  3. Maximum number of TGs connecting network nodes with the same APPN network id

    This parameter is an estimate of the maximum number of TGs connecting network nodes in the sub-network (that is, in the topology known by this node).

    Valid Values: 9 to 64000

    Default Value: 3 times the value of the maximum number of network nodes in the sub-network.

  4. Maximum number of ISR sessions

    This parameter specifies an estimate of the maximum number of intermediate session routing sessions (ISR) expected to be supported by this router network node at any one time.

    This parameter is used in conjunction with the Maximum number of adjacent nodes parameter by the automatic tuning algorithm to calculate the values for the Maximum shared memory and Maximum cached directory entries tuning parameters.

    Valid Values: 10 to 7500

    Default Value: 200

  5. Percent of adjacent nodes with CP‐CP sessions using HPR

    This parameter specifies an estimate of the maximum number of adjacent EN and NN, with CP-CP sessions using option set 1402 (Control Flows over RTP option set).

    Valid Values: 0 to 100%

    Default Value: 0 (none)

  6. Maximum percent of ISR sessions using HPR data connections

    This parameter specifies the largest percentage of ISR sessions that use ISR to HPR mappings.

    Valid Values: 0 to 100%

    Default Value: 0 percent

  7. Percent adjacent nodes that function as DLUR PU nodes

    This parameter specifies the largest percentage of adjacent nodes allowed to function as adjacent DLUR PU nodes.

    Valid Values: 0 to 100 percent

    Default Value: 0 percent

  8. Maximum percent ISR sessions used by DLUR LUs

    Valid Values: 0 to 100%

    Default Value: 0%

  9. Maximum number of ISR accounting memory buffers

    This parameter specifies a maximum number of buffers to be reserved for ISR session accounting.

    Valid Values: 0 or 1

    Default Value: 0 (default is 1 if ISR session accounting is enabled)

  10. Maximum memory records per ISR accounting buffer

    This parameter specifies a maximum number of memory records per ISR accounting buffer.

    This parameter is configurable using the &cfgprg; only.

    Valid Values: 0 to 2000

    Default Value: 100

  11. Override tuning algorithm

    When enabled, this parameter overrides the tuning calculations generated by the Command Line and enables you to specify explicit values for the Maximum shared memory parameter and the Maximum cached directory entries parameter.

    This parameter is configurable using the &cfgprg; only.

    Valid Values: Yes, No

    Default Value: No

  12. Maximum shared memory

    This parameter specifies the amount of shared memory within the router that is allocated to the APPN network node. APPN uses its shared memory allocation to perform network operations and to maintain required tables and directories.

    Valid Values: 1280 - 40960 KB

    Default Value: 40960 KB

  13. Percent of APPN shared memory to be used for buffers

    This parameter specifies the amount of shared memory that APPN will use for buffers.

    Valid Values: 10 to 50

    Default Value: 10% or 512 Kilobytes, whichever is larger.

  14. Maximum cached directory entries

    This parameter specifies the number of directory entries to be stored or cached by the router network node. If a directory entry for a node is cached, the router does not need to broadcast a search request to locate the node. This reduces the time it takes to initiate sessions with the node.

    Valid Values: 0 to 65535

    Default Value: 4000

Select the Submit button.