For each card generated in the system, the Node Manager software attempts to find the applicable Link File directory containing the card's MCAST.TXT and EL.TXT file. Recall that Node Manager software will overwrite the card's Multicast Address list with the data contained in its MCAST.TXT file, and will log •bad", •orphan", or •trace" packets to its EL.TXT file (when the card is properly configured).
The Node Manager software first checks whether or not the local system is disk"based (a system call is used). If the local system is disk"based, a flag is set. For each LANIC card installed, this flag is checked and the FILES802 directory (if it exists) is searched for a Link File directory name that matches the Station Address of the applicable card. A successful match results in the Station Address being stored in a •File Server Station Address" variable maintained by the Node Manager software.
If the local system is not disk"based, or if a Link File directory cannot be found locally for a particular card, the Download Server Station Address stored on the card (in NOVRAM) is inspected:
DIf the Download Server Station Address is a valid Individual Station Address, a packet containing the appropriate command is transmitted on the LAN to that address. The remote Node Manager software receives this command and searches its FILES802 directory for the applicable Link File directory. If successful, it notifies the local node through an appropriate response.
On receiving this response, the local Node Manager software stores the Download Server Station Address in its File Server Station Address variable since it correctly identifies the location of the Link File directory.
DFor a zero Download Server Station Address, there is no transmission.
When unable to find a Link File directory for a particular card, the File Server Station Address variable for that card is set to zero. With no MCAST.TXT file, Multicast Addresses will not be configured on the card at boot"up or Node Manager software initialization.
Unless a major error arises, the Node Manager software continues operation.
Note
If the local system is to contain the local card's Link File directory, the Down" load Server Station Address on the card should be changed either to zero, or to the Station Address of the card (see Chapter 5 for the appropriate command). Either will prevent Node Manager from transmitting onto the LAN when searching for the node's Link File directory.
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