From: Petr Lapukhov (petr@internetworkexpert.com)
Date: Wed Jul 16 2008 - 09:45:32 ART
Adam,
Unfortunately it is not possible to get over with redistribution using just
a few tricks. The are two general issues with redistribution:
1) Taken in general, it's quite complicated and hard to treat formally.
2) In real life and in the lab exam the importance of redistribution is
usually overrated :)
However, if you want to see some detailed (quite general) explanations of
the reasons to manipulate external AD values, metrics etc. you may read the
following:
http://blog.internetworkexpert.com/2008/02/09/understanding-redistribution-part-i/
HTH
-- Petr Lapukhov, CCIE #16379 (R&S/Security/SP/Voice) petr@internetworkexpert.comInternetwork Expert, Inc. http://www.InternetworkExpert.com Toll Free: 877-224-8987 Outside US: 775-826-4344 Online Community: http://www.IEOC.com CCIE Blog: http://blog.internetworkexpert.com
2008/7/16 Adam Elghafri <ccie.adam@gmail.com>:
> ok.. i ve done volume 3 labs + first five labs of volue 2 > > > what i noticed is that the solution always do the followint no matter what: > > when rip and ospf are matually redistrebuted===> under rip process> > distance 109 > when eigrp and ospf are matually redistrebuted ==> under ospf > process>distance of external 171... > > i dont see any need for this !!!!! > > PLUS... what i found out and concluded at is the following golden rulde: > > when there is 2 points of redistribution==> then always always pup the > metric to a high level > > ex. > > #router ospf > -router)#redistribute eig 10 subnets metric 200 > > or > #router rip > -router)#redistribute eig 10 metric 8 > > or > #router eigrp 10 > -router)#redistribute ospf 1 metrik 1 100000 1 1 1 > (note BW=1 is worst, 100000 for delay is worse enough, rest are 1's as > they are not into the equation) > > > with this strategy, i always get a loop-free topology! > > now i thought of all the possible combinations of redistributions out > there (almost all).. and to what i concluded at... if u pup the metric > up.. no matter what.. it will become loop-free... > > > so why the confusion of puping up/down the distance or tagging or > whatever.. > > > Mr. Petr.. Scott.. i need ur opinion > > > > > ========================================================== > (very corner note to be mentioned here... eigrp acts veryyy wiredly > when u have 2 points of redistribution, check this pic out: > > http://tinypic.com/view.php?pic=2n9jgn7&s=4 > > in R3: > R3(config)#router eig 10 > R3(config-router)#redistribute connected route-map LOOPBACK metric 1 1 1 1 > 1 > > in R2: > R2(config)#router ospf 1 > R2(config-router)#redistribute eig subnets > > in R1 > R1(config)#router eig1 10 > R1(config-router)#resdistribute ospf 1 metric 1 100000 1 1 1 > > R1#sh ip eig topo > P 10.0.0.0 through R2 FD 79898465464 > from R2 79898465464/0 > from R3 5645/457 > > > did u noticed what i noticed.. the DUAL is taking the higher cost route > (ofcourse non of them will make to the routing table... as the ospf > one will dominate...but i want to point to what is happenning in the > routing table) > > sorry for the long msg.. but i want to put a final conclusion for > redistribution > > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html
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