Another good one!! Could also add that Ospf timers need to be kept in mind if the hub is using say for ex. a multipoint and the spoke a point-to-point and the task is NOT to configure any #ip ospf network cmd. on the spokes....
>From: "The Long and Winding Road" >Reply-To: "The Long and Winding Road" >To: [EMAIL PROTECTED] >Subject: OSPF Tricks of the Trade [7:66308] >Date: Thu, 27 Mar 2003 05:09:30 GMT > >After wrestling with Solie this afternoon, it suddenly occurred to me that >there is a typical instruction in the various practice labs that can end up >driving you nuts if you look at it from one direction, but which is really >simple if looked at from another. > >The topology: several routers over frame relay. Usually four routers. One >acts as hub, The others as spokes. > >the instruction: you must use subinterfaces only on the hub. On the spokes >you MUST use the physical interfaces. two of the spoke routes connect to >the >hub via one subinterface. The other router connects to the hub on the other >subinterface. > >the catch: some bizarre restriction or other about network types, commands >that can or cannot be used, the usual BS. > >It occurs to me that working backwards, you can solve most problems, >whatever the restrictions and twists. > >Frame relay: OSPF default >----------------- -------------------- > >physical interface non broadcast > >subinterface - p2p point-to-point > >subinterface - multipoint non broadcast > >I think the knee jerk reaction is to create a multipoint subinterface for >the link to the two spoke routers, and a p2p subinterface for the link to >the single spoke router. Then moan in despair as you realize that the >instructions forbid the use of any ip ospf network commands anywhere. > >But if you look from the higher level viewpoint, you see that the physical >and the multipoint subinterface default to the same type of OSPF network. >Life is easier after that. > >Is this making sense? I'm at the end of a very long day, with too many >subtleties floating around in what's left of my brain. > >Good night, everyone. > > > > > > > >-- >TANSTAAFL >"there ain't no such thing as a free lunch" _________________________________________________________________ MSN 8 with e-mail virus protection service: 2 months FREE* http://join.msn.com/?page=features/virus Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=66321&t=66308 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
