SNA Application Access cross domain using X.25

ITEM: RTA000106242



Hello, we want to connect a RS/6000 with Application Access to a host           
using X.25.                                                                     
                                                                                
Actually we have the following configuration:                                   
                                                                                
 +--------------+      +-----------------+              AS/400(1)               
    certi1      eth        certi2          X25                              
   SNA/AA 1.2  +------+  SNA/Server 3.1 +------------- AS/400(2)               
                       SNA/Gateway                                          
 +--------------+      +-----------------+              AS/400(n)               
 Several AS/400's connect certi2 thru X25, certi2 get sessions from             
SNA/AA on certi1 and SNA/Gateway is responsible for delivering                  
those sessions to the AS/400.                                                   
                                                                                
Now we want to connect to a Host S/390 system using the X25 network.           
                                                                                
A couple of questions:                                                          
                                                                                
1.-Is it possible to run SNA/AA and SNA/Server in the same                      
   machine ??? So, the host is going to be adjacent to the SNA/AA               
   and falls in the cross domain configuration of the SNA/AA                    
   manuals.                                                                     
                                                                                
2.-Is it possible to connect the host via X.25 to certi2 machine                
   and then to certi1 machine ??? We are not sure about the                     
   SSCP-SSCP session if could go thru the certi machine, and what               
   happens with the commands for activate the virtual and explicits             
   routes.....                                                                  
                                                                                
Regards.                                                                       
                                                                                
ANSWER                                                                          
                                                                                
 Yes it is possible to run SNA/AA and Comm. Server on the same                  
 box.  The two can share a LAN adapter as long as each uses distinct            
 local SAP addresses.  For an SDLC adapter, each would need to                  
 use a distinct port.  If the intent is for Comm. Server to talk                
 to SNA AA on the same box then two token-ring adapters will be                 
 required.  Using two adapters, you can create a loop back                      
 configuration.                                                                 
                                                                                
                                                                                
 The SNA Gateway cannot carry FID4 traffic (Cross-domain sessions).             
 Thus you cannot use the SNA Gateway product to provide X.25                    
 access to SNA AA from remote SNA hosts.                                       
                                                                                
S e a r c h - k e y w o r d s:                                                  
X.25 COMM SERVER AIX SNA APPLICATION ACCESS VTAM                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                               


WWQA: ITEM: RTA000106242 ITEM: RTA000106242
Dated: 05/1997 Category: ITSCSAIXSNA
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