MPROUTE Advertises Invalid Routes

 
 APAR Identifier ...... PQ79971      Last Changed ........ 03/12/24
 MPROUTE ADVERTISES INVALID ROUTES
 
 Symptom ...... IN INCORROUT         Status ........... CLOSED  PER
 Severity ................... 4      Date Closed ......... 03/11/19
 Component .......... 5735FAL00      Duplicate of ........
 Reported Release ......... 420      Fixed Release ............ 999
 Component Name TCP/IP V2 FOR V      Special Notice
 Current Target Date ..              Flags
 SCP ...................
 Platform ............
 
 Status Detail: APARCLOSURE - APAR is being closed.
 
 PE PTF List:
 
 PTF List:
 Release 3A0   : UQ82482 available 03/12/04 (0401 )
 Release 420   : UQ82483 available 03/12/04 (1000 )
 Release 430   : UQ82484 available 03/12/04 (1000 )
 Release 440   : UQ82485 available 03/12/04 (0401 )
 
 Parent APAR:
 Child APAR list:
 
 ERROR DESCRIPTION:
 Customer reports that their z/OS MPROUTE server is issuing
 messages that indicate the z/VM MPROUTE server is advertising
 an invalid route:
 
   EZZ7946I error in advertisement: typ 5 id 0.255.255.255 org
            xx.xx.xx.xx
 
 A trace of the z/VM MPROUTE server confirms that the bad
 advertisement is originating from the z/VM MPROUTE server and
 that the advertisement is in error.
 
 LOCAL FIX:
 
 PROBLEM SUMMARY:
 ****************************************************************
 * USERS AFFECTED: All users of MPRoute.                        *
 ****************************************************************
 * PROBLEM DESCRIPTION: MPROUTE is sending out incorrect        *
 *                      advertisements for 0.255.255.255        *
 ****************************************************************
 * RECOMMENDATION: APPLY PTF                                    *
 ****************************************************************
 When static DEFAULT routes are coded in the GATEWAY statement,
 the TCP/IP stack sends the routes to MPROUTE. The stack is
 sending a destination of 0.0.0.0 and a subnetmask of 255.0.0.0.
 The incorrect subnetmask is causing MPROUTE to send type 5
 advertisements for a 0.255.255.255 route.
 
 PROBLEM CONCLUSION:
 TCP/IP has been changed to send a 0.0.0.0
 subnetmask for DEFAULT routes.
 
 TEMPORARY FIX:
 
 COMMENTS:
 
 MODULES/MACROS:   TCIPDOW  TCPARSE  TCPIP
 
 SRLS:      NONE
 
 RTN CODES:
 
 CIRCUMVENTION:
 
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