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APPC Mode Properties

The following tabs are available on the APPC Mode Properties Sheet:

APPC Mode Properties: General

Mode Name
Enter a Mode Name.

Comment
Optionally, type a comment of not more than 25 characters.

APPC Mode Properties: Limits

Parallel Session Limit
Specify the maximum number of sessions allowed with this mode. To allow only a single session, specify 1. To allow parallel sessions, specify a value greater than 1. If the local APPC LU to be used with this mode is dependent, specify 1; dependent local APPC LUs cannot have parallel sessions. One of the key mode properties is the Parallel Session Limit. This limit determines whether an LU-LU pair can carry on only one interaction at a time (a parallel session limit of 1), or multiple concurrent interactions (a parallel session limit greater than 1). If parallel sessions are to be allowed with an LU-LU pair, the local LU must be independent, and the remote LU in the pair must support parallel sessions.

If the LU-LU pair can carry on multiple parallel sessions, other mode properties, such as minimum contention winner limit, determine to what extent each LU can initiate interactions.

Minimum Contention Winner Limit
Specify the Minimum Contention Winner Limit. The sum of the Minimum Contention Winner Limit and the Partner Min Contention Winner Limit must be less than or equal to the Parallel Session Limit.

Partner Min Contention Winner Limit
Specify the Partner Min Contention Winner Limit. The sum of the Partner Min Contention Winner Limit and the Minimum Contention Winner Limit must be less than or equal to the Parallel Session Limit.

Automatic Activation Limit
Specify the number of contention winner sessions to be activated for the local LU whenever the connection for this mode is started. In a local contention winner session, the local LU can initiate conversations without permission from the partner LU.

This does not apply for single-system APPC (communication between two local LUs on the same system).

APPC Mode Properties: Characteristics

Pacing Send Count
Specify the maximum number of frames for the local LU to send without an SNA pacing response from the partner LU. If you specify 0, the local LU can send an unlimited number of frames without receiving a response; in this case, the partner LU can negotiate and set a limit on the count.

Pacing Receive Count
Specify the maximum number of frames for the local LU to receive from the partner LU before the local LU sends an SNA pacing response. If you specify 0, the local LU can receive an unlimited number of frames without sending a response.

Max Send RU Size
Specify the maximum size for RUs sent by the TP(s) on the local system.

It is not necessary to set a minimum send RU size, which is 256 on Host Integration Server.

Max Receive RU Size
Specify the maximum size for RUs received from the TP(s) on the remote system.

It is not necessary to set a minimum receive RU size, which is 256 on Host Integration Server.

High-Priority Mode
Select to give preference to communication with this mode over communication with a low-priority mode.

APPC Mode Properties: Partners

This tab allows you to Add or Remove APPC LU partnerships from the Host Integration Server configuration file. The mode name appears in the title. The list box shows the Server, Local LU Alias, Remote LU Alias, Connection, and which LUs are partnered with the APPC mode in the title.

Remove
Click Remove to delete APPC LU partnerships from the Host Integration Server configuration file.

Add

  1. Click Add to add APPC LU partnerships from the Host Integration Server configuration file. The Add Partnerships dialog box appears.

  2. Select a Server name from the subdomain by clicking the DOWN arrow in the drop down list.

  3. After the server is selected, a list box showing Local LUs and a list box showing Partner LU and Connection are filled. Make selections from each list to establish partnerships.

  4. Click Apply to add pairs to the APPC Mode Properties: Partners page while keeping the Add Partnerships dialog active.

  5. When you finish selecting partnerships, click OK on the Add Partnerships dialog to return to the APPC Mode Properties: Partners page.

  6. Click OK on the APPC Mode Properties: Partners page to commit the changes to the Host Integration Server configuration file.

    Note

    You can select multiple modes for partnerships using the same LUs. Press the SHIFT key and the CTRL key and click to select non-contiguous modes.

    Note

    The Host Integration Server configuration file is updated dynamically. There is no need to stop and restart SNA service.

APPC Mode Properties: Compression

Maximum Send Compression
Select the maximum compression desired from the drop down list. The valid values are: None, Run Length Encoding (RLE), and LZ9. These options offer progressively better compression, but at a progressively higher CPU usage.

Maximum Receive Compression
Select the maximum compression desired from the drop down list. The valid values are: None, Run Length Encoding (RLE), and LZ9. As with Maximum Send Compression, these options offer progressively better compression, but at a progressively higher CPU usage cost.

Allow LZ and RLE Compression
If LZ9 is used, this option controls whether data is compressed using RLE before being further compressed using LZ9.

Endpoint Only Compression
This option controls whether intermediate nodes may use compression if one of the endpoints does not support or otherwise does not use compression.

See Also

SNA Manager Help