z/OS Communications Server: SNA Customization
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Example 3: Using only a portion of the list

z/OS Communications Server: SNA Customization
SC27-3666-00

  1. The virtual route selection exit routine receives:
    • Address of VR1,TP1 descriptor block
    • Address of VR2,TP1 descriptor block
    • Address of VR3,TP0 descriptor block
    • (*)Address of VR4,TP2 descriptor block
  2. The virtual route selection exit routine turns on the high-order address bit in VR2,TP1 and returns to VTAM®:
    • Address of VR1,TP1 descriptor block
    • (*)Address of VR2,TP1 descriptor block
    • Address of VR3,TP0 descriptor block
    • Address of VR4,TP2 descriptor block
  3. VTAM uses only VR1,TP1 and then VR2,TP1 to establish the pending session. If neither route can be activated, the session-establishment request is terminated because no paths are available.
Parent topic: Examples of virtual route selection exit routine processing

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