Network Map File (NETMAP)
The network map file is a VSAM KSDS that contains network definition information, including the network names for the local node and other (adjacent) nodes in the network, the communication addresses for use by the API, and various control information used by IBM® Connect:Direct®
To estimate the size of the network map, you must determine how many nodes are needed and the communications used for each node. This includes determining the node IDs for your network (including the local node name), all APPLIDs (SNA type), and all TCP/IP addresses (or DNS names) for the nodes.
The following chart defines the basic size of records for planning how large to make the network map:
|Record||Size (in bytes)||Description/Comments|
|Control Records||250||Base records for NDM control|
|ADJACENT.NODE||124||Basic adjacent node information|
|ALT.COMM||32 + 59(n)||Alternate communications addresses. Each set adds 1 to “n”.|
|LDNS||278||Holder of the DNS name for an ADJACENT.NODE|
|74 + x||1 per node definition and each segment (x) adds
Conact Name - 40, Phone - 40, Description - 255
|IPv6||232||This record exists for an ADJACENT.NODE if the
node is defined with any of the following items specified:
|UDT||96||UDT support has been removed. Please update your Netmap to delete all UDT ADJACENT NODEs.|
|TCP API||60||Used to specify the address for API|
|APPLIDs||40 + 8x||SNA APPLIDs for a node. Add 1 to x for each node ID specified|
|xNODE.LUS||28 + 8(x)||If either PNODE or SNODE.LUS is specified, add 1 to x for each node name specified.|
|Node Usage||1024||1 US record for each Adjacent Node|
For example, if the network map contains 25 nodes with API APPLIDs in each of the 25 nodes, it requires approximately the space illustrated in the following table.
|Netmap Definitions||Number||Size (in bytes)|
|Control Records + Local node||3||362|
|APPLIDs||25 nodes with 20 APPLIDs||5350|
For those installations that make frequent updates to the network map, it is recommended that the allocation be done on a cylinder boundary and be at least one cylinder more than currently needed. CA/CI splits may take place as additions and updates are done.