Dave Ideally questions regarding Communications Server, both the IP and SNA components, should be posed in the IBMTCP-L list:
For IBMTCP-L subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBMTCP-L However, since I'm here, I'll have a shot at providing an answer. > I believe that static routes are always preferred over dynamic routes ... No. You need to become familiar with the description of the (NO)REPLACEABLE parameter of the ROUTE statement which, since it's not too much, the text of which follows: <quote> REPLACEABLE | NOREPLACEABLE Indicates whether or not the static route can be replaced by OMPROUTE and router advertisements when a dynamic route to the same destination is discovered. NOREPLACEABLE Indicates that static routes cannot be replaced by dynamic routes. The static route is always used to reach the destination, regardless of when dynamic routes are available. This is the default setting. This parameter can be abbreviated as NOREPL. REPLACEABLE Indicates that the static route can be replaced by OMPROUTE and router advertisements when a dynamic route to the same destination is discovered. This parameter can be abbreviated REPL. Restrictions: - Only one type (replaceable or nonreplaceable) of static route can be defined to the same destination. All static routes defined to a destination must match the type of the first static route defined to that destination. Any definitions that do not match that type are rejected. - Replaceable static routes cannot be defined to destination addresses that correspond to dynamic VIPAs for which the TCP/IP stack is a sysplex distributor target. Tip: You can use the Netstat ROUTE/-r RSTAT command to display all replaceable static routes currently configured. </quote> http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/F1A1B4B1/2.9 > With OMPROUTE (OSPF) does CommServer override ... a static route? Yes, if permitted by the specification of REPLACEABLE on the ROUTE statement. > I am told the static routes in CommServer are only honoured until the dynamic > routes get in the routing tables.[1] You have been told correctly - perhaps by someone who has read the description of the ROUTE statement - assuming, of course, that REPLACEABLE has been specified on the ROUTE statement. > And then I'm told these dynamic routes will take preference to the static > routes. The issue - and I mean "issue" in its traditional sense, not the recently emerged euphemism so favoured between the shining seas but most regrettably spreading throughout the supposedly English-speaking world - does not arise. The replaced static routes will have disappeared. Check the display of the routing table, the actual one, NETSTAT ROUTE, not the OMPROUTE one. Perhaps you need to appreciate that the IP logic of Communications Server provides an API for OMPROUTE to use in order to manage the routing table. I first encountered probably a rudimentary version of this API when teaching myself the socket API from the description of the C sockets API, the only API - not counting Pascal - at the time. Among the options of the ioctl() call, you find the so-called "commands" SIOCADDRT and SIOCDELRT. That - together with the rtrouteh.h structure - told me all I needed to know about how dynamic routing protocol programs worked. > Does this mean that CommServer's OSPF can override ... a ... route <that> ... > was established with a static definition? Yes. Be aware that the operation of the routing table can these days be adjusted by use of "Policy-based routing" - I assume based on the name of the function. This is a function with which I have yet to acquaint myself. http://publibz.boulder.ibm.com/cgi-bin/bookmgr_OS390/BOOKS/F1A1B3B1/1.6.17 - [1] Note that, since I was obliged to correct a couple of typos, I took a liberty in correcting another! - Chris Mason On Fri, 23 Nov 2012 11:42:27 -0600, Hansen, Dave L - Eagan, MN <[email protected]> wrote: >Group, > > We are embattled over the question of static routes. We are running z/OS > V1R13. I believe that static routes are always preferred over dynamic routes > (there are some exceptions if the Administrative Distance - AD is changed). > And that changing a static route requires manual intervention. > >Q). With OMPROUTE (OSPF) does CommServer override or reset a static route? I >am told the static routes in CommServer are only honored utill the dynamic >routes get in the routing tables. And then I'm told these dynamic routes will >take preference to the static routes. Does this mean that CommServer's OSPF >can override or select a different route than what was established with a >static definition? > > > Thank you, Dave > > >Dave Hansen ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
