HP 3000 Manuals

NS3000/iX NMMGR Screens Reference Manual

FDDI Network Interface Configuration  

The FDDI Network Interface Configuration screen (#200) in figure 9-3 is
displayed when you select an NI name and the NI type FDDI at the Network
Interface Configuration screen (figure 9-2) 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 

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        This field specifies the number of buffers to
buffers                   be allocated for outbound data.  Outbound
                          buffersare 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    Specifies whether or not the system should load
mapping?  (Y/N)           mappings from the network directory at network
                          startup.  If you have non-HP nodeson 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 for information about the network
                          directory.

                          Default value:  N

                          Range:  Y or N

MPE/iX 5.0 Documentation