VR-based TGs and CP-CP sessions should be defined only between physically adjacent VTAM® nodes (or composite network nodes). They should not be defined through an intermediate VTAM. For example, in Figure 2, VR-based TGs and CP-CP sessions should be defined only between HOST1 and HOST2 and between HOST2 and HOST3. CP-CP sessions between HOST1 and HOST3 (through HOST2) are unnecessary, because session setup flows can be sent from HOST1 to HOST3 using HOST2 as an intermediate APPN node. Also, because RSCV pruning is performed, a two-hop VR-based TG route from HOST1 to HOST2 to HOST3 is pruned to a one-hop VR-based TG route from HOST1 directly to HOST3. This pruning allows a VR-based TG to be used between HOST1 and HOST3, even though it was not explicitly defined.