EZBH013E

Explanation
 The CSTCP_IPMAXRT6_TCPIPstackname check determined
that the current number of  IPv6 indirect static and dynamic routes
in the TCP/IP stack routing table is  greater than the maximum threshold
value for this check.  The high number of  routes might cause high
CPU consumption from routing changes and less than  optimal operations
in OMPROUTE and the TCP/IP stack.  Actions should be taken  to reduce
the number of routes. 
 The check name includes the job name
of the TCP/IP stack as a suffix.  
 current_val 
is  the current number of IPv6 indirect routes in the TCP/IP stack
 routing table.  
 high_val  is the highest
recorded number of IPv6 indirect routes in the TCP/IP  stack routing
table during the time interval as defined in the INTERVAL  parameter
for the IBM® Health Checker for z/OS®.     
 maximum_val 
is the configured or default maximum threshold for the number of 
IPv6 indirect routes in the TCP/IP stack routing table as defined
in the  IPMAXRT6 parameter for the IBM Health
Checker for z/OS.

System action
 The system continues processing. 

Operator response
 Contact the system programmer.

System programmer response
 To reduce the number of OSPF indirect
routes, IBM suggests that the
OSPF areas  that contain the z/OS Communications
Server application host or sysplex be  configured as stub areas for
optimal performance. Stub areas are used so that  IPv6 prefixes from
other areas are not flooded into the stub areas by the area  border
routers.  See the minimizing the routing
responsibility of z/OS Communications
Server information in z/OS Communications Server: IP Configuration
Guide.
 Route filtering options for the address
ranges in the areas are also available  to control the OSPF route
advertisements.  See the IPv6_AREA statement and
the IPv6_RANGE statement in z/OS Communications Server: IP Configuration
Guide for more information about the Stub_Area
and Advertise parameters.
 To reduce the number of indirect
RIP or static routes, IBM suggests
the  configuration of RIP or static networks that contain the z/OS Communications  Server application
host or sysplex use route summarization and/or filters for  optimal
performance.  Use of IPv6 prefixes or default routes that represent
the  more specific indirect routes provides the route summarization.

 Filtering options are also available to control the RIP
route advertisements.   See the IPv6_RIP_INTERFACE
statement in z/OS Communications Server: IP Configuration
Guide for information on the receive filter parameters.
 See the BEGINROUTES
statement in z/OS Communications Server: IP Configuration
Reference for information on defining IPv6 prefixes
or default routes. Modify  the routes as necessary for route summarization.
  Then issue a VARY  TCPIP,,OBEYFILE command with an OBEY file that
contains the modified  BEGINROUTES block.   

User response
 Not applicable.

Problem determination
 Not applicable.

Source
 z/OS Communications
Server TCP/IP

Module
 EZBHCCK1

Routing code
 Not applicable.

Descriptor code
 3

Automation
 Not applicable.

Example
  EZBH013E The current number of IPv6 indirect routes exceeds the maximum  threshold 
         (Current = 4000, High = 3000, Maximum = 2000)