VTAM® refers to a communication network management (CNM) routing table to determine which CNM application program is to receive an unsolicited network-services request unit that requires further processing. The IBM-supplied default CNM routing table is named ISTMGC01. For any user-written application program to use the CNM interface to receive unsolicited request units, write a supplemental table with an entry for each RU. This table should be named ISTMGC00.

A CNM routing table consists of a 12-byte header entry and routing table entries. The 12-byte header entry contains the size and number of routing table entries that follow it. Each routing table entry contains the network services RU type to be routed, followed by the application program name to which the network services RU is to be routed.

A listing of the IBM-supplied CNM routing table is found in z/OS Communications Server: SNA Customization.

For detailed information about how to implement a user-written CNM routing table, see z/OS Communications Server: SNA Customization.