Adjacent SSCP lists for CDRSCs

You can increase control over adjacent SSCP selection by creating adjacent SSCP lists for CDRSCs in an adjacent SSCP table. When an adjacent SSCP list is identified for a CDRSC, session setup requests are sent to only the SSCPs in the list. If the owning SSCP is not found through one of the adjacent SSCPs in the list, session establishment fails.

In the CDRSC major node that follows, you will find CDRSC definition statements that specify the names of adjacent SSCP lists. The ADJLIST operand is used to specify the name of the list.

**********************************************************************
*  NAME:  CDRSC7B
*
*  USE:   DEFINE THOSE CROSS DOMAIN AND CROSS NET RESOURCES KNOWN TO
*         SSCP7B.
**********************************************************************
CDRSC7B  VBUILD  TYPE=CDRSC
*
NETA     NETWORK NETID=NETA
*
APPL1    CDRSC CDRM=SSCP1A,ADJLIST=LIST1  * Adjacent SSCP List is LIST1
APPL2    CDRSC CDRM=SSCP1A,ADJLIST=LIST2  * Adjacent SSCP List is LIST2
APPL3    CDRSC CDRM=SSCP1A,ADJLIST=LIST3  * Adjacent SSCP List is LIST3
APPL4    CDRSC CDRM=SSCP1A,ADJLIST=LIST4  * Adjacent SSCP List is LIST4
L3A3278A CDRSC CDRM=SSCP1A
L3270A   CDRSC CDRM=SSCP1A
L3270B   CDRSC CDRM=SSCP1A
L3270C   CDRSC CDRM=SSCP1A
LTESTA   CDRSC CDRM=SSCP1A
LTESTB   CDRSC CDRM=SSCP1A
LTESTC   CDRSC CDRM=SSCP1A
L3284A   CDRSC CDRM=SSCP1A
TSO1     CDRSC CDRM=SSCP1A
*
NETC     NETWORK NETID=NETC
*
ECHOC11  CDRSC CDRM=SSCP9C,ADJLIST=LIST2  * Adjacent SSCP List is LIST2
ECHOC12  CDRSC CDRM=SSCP9C,ADJLIST=LIST1  * Adjacent SSCP List is LIST1
CRECHOC1 CDRSC CDRM=SSCP9C
TSO9     CDRSC CDRM=SSCP9C,ADJLIST=LIST4  * Adjacent SSCP List is LIST4
L3270C1A CDRSC CDRM=SSCP9C
L3270C1B CDRSC CDRM=SSCP9C
L3270C1C CDRSC CDRM=SSCP9C

For samples of adjacent SSCP tables used to implement the adjacent SSCP list function, see Defining an adjacent SSCP list for CDRSCs.

For a specified cross-domain resource, you can use the MODIFY RESOURCE command while VTAM® is running to:

Delete the name of the resource's current adjacent SSCP list
Add the name of an adjacent SSCP list to a cross-domain resource which does not currently have an adjacent SSCP list defined for it
Replace the name of the current adjacent SSCP list with the name of a different adjacent SSCP list.

For more information about this command, see the z/OS Communications Server: SNA Operation.

For more information about adjacent SSCP lists for CDRSCs, see the z/OS Communications Server: SNA Network Implementation Guide.