HP UX SNAplus2 manual Configuring PU Concentration

Configuring Passthrough Services

Configuring PU Concentration

Configuring PU Concentration

Normally, a dependent LU session requires a direct communications link to the host computer. However, a node running SNAplus2 that has a direct communications link to the host can also provide PU concentration facilities to LUs on downstream computers, enabling them to access the host over the communications link from the SNAplus2 node. The downstream computer must contain an SNA PU type 2.0 or 2.1 to support dependent communication with the host. For example, the downstream computer could be another computer running SNAplus2 in a standalone configuration.

Using the PU concentration feature, all the data transferred between the host and the downstream computer is routed through the SNAplus2 local node. This enables a downstream computer to share a host connection with SNAplus2 or with other downstream computers, instead of requiring a direct link. For example, you can set up several downstream computers connected to SNAplus2 over a local token ring network, so that they all access the same long-distance SDLC leased line from SNAplus2 to the host.

Using PU concentration also simplifies the configuration at the host. The host configuration needs to include only the SNAplus2 computer and its host communications link; the LUs at the downstream computers are configured as part of the resources of the SNAplus2 computer. The host computer is not aware that PU concentration is being used.

Before configuring PU concentration, you must perform the following configuration tasks:

•Define the local node as described in “Configuring the Node”.

•Configure a port and link station for dependent traffic between the local node and the host, as described in Chapter 5, “Defining Connectivity Components.” Also, configure ports and link stations for dependent traffic between the local node and the downstream nodes. For downstream links, you can configure a template on the port to support implicit downstream LUs (LUs that are not explicitly defined on the local node).

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