FDDI Network Interface Configuration

The FDDI Network Interface Configuration screen (#100) in Figure 9-3 “FDDI Network Interface Configuration Screen” is displayed when you select an NI name and the NI type FDDI at the Network Interface Configuration screen (Figure 9-2 “Network Interface Configuration Screen”) and press the [Add] or [Modify] function key. It is also displayed when you type the path name:

@NETXPORT.NI.NIname

in the Command window of any screen and press the [Enter] key, where NIname is a configured FDDI NI name.

Figure 9-3 FDDI Network Interface Configuration Screen

The FDDI network interface (NI) module serves to interface the upper layers of the transport product to the link layer. This screen supplies the information required for that interface. All of the fields are used for internal resource allocation.

Press the [Save Data] function key to transfer the data displayed on the screen to the configuration file you are creating or modifying. Verify that the data record has been created by checking that the Data flag is set to Y. From this screen you proceed to the screens used to configure the FDDI network interface link, and internetwork routing.

Choose the item you wish to configure, and press the corresponding key.

Fields

Network segment size

This field specifies the largest packet that will be sent by the FDDI device. The only reason for entering a value smaller than 4032 is to make better use of memory for those systems where it is known that upper layer services will always send shorter messages. Note that whenever packets larger than the network segment size are sent, they will be fragmented to the network segment size, thus incurring fragmentation overhead at the source and assembly overhead at the destination node.

Default value: 4032 bytes

Range: 256-4600

Number of outbound buffers

This field specifies the number of buffers to be allocated for outbound data. Outbound buffers are used for outbound data packets and are held by the transport until they are acknowledged by the destination node. Underallocation may adversely affect TCP throughput. Overallocation may waste core memory.

Related screen:

NETXPORT.GPROT.TCP
The maximum number of connections is configured here. If it is increased, consider increasing the number of outbound buffers also.

Default value: 128

Range: 128-4096

Load network directory mapping? (Y/N)

Specifies whether or not the system should load mappings from the network directory at network startup. If you have non-HP nodes on the FDDI (nodes that do not support the ARP protocol,) you must enter these nodes into the network directory and set load network directory mapping to Y.

HP recommends the default unless non-HP nodes are on the network and the network directory has been successfully completed. Refer to Chapter 13 “Network Directory” for information about the network directory.

Default value: N

Range: Y or N

FDDI Network Interface Configuration

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Fields