.-TOPO--=--CONNECT-------------. >>-+------------------------------+---------------------------->< | .-CONNECT---------. | '-TOPO--=--+-----------------+-' +-connection_cost-+ '-NONE------------'
| statements: | PU |
| dependencies: | APPN only |
| range: | 0–255 |
Controls the way APPN connections using this link station will be reported to APPN topology and routing services for inclusion into APPN functions.
If you change a VTAM's node type from network node to
end node by deactivating the VTAM® and
then reactivating it with NODETYPE=EN, you might need to change the
switched PU definitions in partner VTAMs to use TOPO=NONE. This is
suggested only if the switched PU connection is predefined and you
have been using this VTAM as
an intermediate routing node.
- TOPO=CONNECT
- APPN topology and routing services receives information about the connection and its characteristics when the connection is activated. When the connection is deactivated, APPN topology and routing services receives notification that the TG is inactive.
- TOPO=connection_cost
- Indicates that the connection is to be treated as auto-active
with a connection cost override. Auto-active allows a switched physical
unit to be selected for routing prior to the actual establishment
of the connection.
If a connection_cost is coded, then CPNAME, NN, and TGN=tg_number must also be coded. If one or more of these operands is not coded, then the connection cannot be reported prior to activation and the TOPO support is forced to CONNECT.
Note: connection_cost is valid only for switched major nodes. - TOPO=NONE
- APPN topology and routing services receives no information concerning connections established with this link station. This means that connections using this link station are not available for APPN network services.