Awesome!! Chuck....This should go down as one of the best redistribution "attack strategy" for the Lab.....Are you going to post in on your web-site?? Many like me can learn from this......
>From: "The Long and Winding Road" >Reply-To: "The Long and Winding Road" >To: [EMAIL PROTECTED] >Subject: CCIE Practice Labs - Redustribution Strategies [7:66306] >Date: Thu, 27 Mar 2003 04:45:47 GMT > >For the past couple of weeks I've been whacking out various CCIE practice >labs. I've also been suffering various degrees of euphoria and depression, >depending upon how badly I was suckered by the redistribution problems. > >After a particularly long and frustrating day with the Cisco ASET Lab #1, >it >suddenly occurred to me that there are many ways to do things, and for some >reason, I've been overlooking what may be the best way to deal with >redistribution. > >Those of you who have worked these practice labs know how it goes. You read >through the lab, then you start configuring. > >Step 1 - set up OSPF >Step 2 - set up RIP >Step 3 - redistribute between OSPF and RIP >Step 4 - set up EIGRP >Step 5 - redistribute between EIGRP and RIP >Step 6 - set up IS-IS >Step 7 - redistribute between IS-IS and OSPF >Step 8 - scream in anguish as you discover that your routing tables have >turned to trash and half your network becomes unreachable. > >ASET #1 was particularly nasty in how it accomplished Step 8 > >Which brings me to the topic of this post. CCIE's and folks who've been >through the Lab without success - what do you think of this approach: > >1) do NOT do any redistribution anyplace until all routing protocols have >been configured everywhere. Yes, I know that typically you have a section >with several steps, one of which is redistribution. But mark your place and >return after the IGPs are up and running and all routes for a particular >IGP >are where they should be. > >2) return to the first redistribution task. Before configuring anything, >refer to your diagram ( you DO write out a nice diagram, don't you? ) and >ask yourself: "after I do one way redistribution, what routes will appear >where?" > >2a) Consider how administrative distance might change things > >2b) Follow the redistribution to it's extreme. For example, if you >redistribute EIGRP into OSPF, what routers will these routes end up on? >Will >there be any implications to the routing tables? > >3) repeat step 2 for every redistribution point, each time considering the >totality of the contents of the redistributed routes. So if you have >redistributed IS-IS into OSPF, how do those redistributed routes flow >through the OSPF domain? > >4) Keep an eye out for things like split horizon > >5) every step along the way, consider what routers need to see what routes. >Watch for situations where necessary routes do not appear. ( you have >probably trashed it because of overzealous filtering. ) > >5) If problems occur, such as a routing loop, trace back where the problem >route came from, and see what can be done to evade the problem. Summary >routes work wonders sometimes. So do route-maps and distribute lists. > >Re-reading this, I see that this topic does not lend itself well to text. I >can say with certainty that I now have a very clear vision of >redistribution >methodology. I've tested it three times now with different labs, and I >believe I am solving the redistribution problems more quickly than ever. I >hope that I have painted enough of a picture that some of you can fill in >the rest. > >Chuck > > >-- >TANSTAAFL >"there ain't no such thing as a free lunch" _________________________________________________________________ STOP MORE SPAM with the new MSN 8 and get 2 months FREE* http://join.msn.com/?page=features/junkmail Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=66320&t=66306 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
