From: Xiao Li (lixiao00@hotmail.com)
Date: Thu Nov 01 2007 - 23:07:40 ART
Thanks for the tips, ya that should work.. I don't really need to append the tag in order to achieve the same result.. I wasn't thinking.. hehe
Best Regards,
Lx
Date: Thu, 1 Nov 2007 18:56:18 -0400From: nilsi2002@gmail.comTo: nergal888@hotmail.comSubject: Re: redistributing.. again..CC: hadek.el-ayachi@nsn.com; lixiao00@hotmail.com; ccielab@groupstudy.comTo answer this question (I didn't look at the lab example exactly):> I can't think of a way to use tag either.. tags are overridden, and>in this lab there is so many point of redistribution. Is there a way to >append the tag like the AS path does in bgp? Or any other way to better>address this problem? Thanks for the advise.If you are redistributing between 3 routing protocols on different routers, this type of tagging can work. You deny a route if it has one tag OR another tag. route-map EIGRP->OSPF deny 10 match tag 90 120!route-map EIGRP->OSPF permit 20 set tag 110
On 11/1/07, Carlos Trujillo Jimenez <nergal888@hotmail.com> wrote:
The same, redistribution is killin me also... Noticed in some (not all) toplogies at internetworkexpert labs, that there is no way to have optimalrouting I hace tried changing distances, metrics, taggig, but there is noway sometimes.>From: < hadek.el-ayachi@nsn.com>>Return-Path: ccielab-owner@groupstudy.com>>I had many problems trying to avoid suboptimal routing and loops in such>a topology. My advices are :>- Don't try to avoid suboptimal routing if it is not asked for, only>loops are indesirable>- there is always a straightforward, a very simple solution for each>senario instead of changing AD,tagging here and there and creat some>mind loops>- redistribution is a manual process. Put your self, in a round robin>style, in one routing protocol and see what can happen to you internal >routes as well as you external routes seperatly when coming back to you.>- use metric instead of AD or tags.>- pay more attention to external routes for each protocol>BR>>>-----Original Message--!
--- >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of>ext Xiao Li>Sent: jeudi 1 novembre 2007 10:47 >To: ccielab@groupstudy.com>Subject: redistributing.. again..>>Hi, I was doing core work book lab 6 this afternoon and the>redistribution really got me hard. I thought of using distance to limit >route feed back is convenient and reliable.. it proves me wrong.>OSPF, RIP , EIGRP are mutually redistributed on R3, R4 and R5.. so I>apply the golden rules: from lower ad to higher ad, no worries, routes >will never get feed back to the lower ad domain because the higher ad>route will not get in the routing table at the other redistribution>point... checked from higher ad to lower ad, use distances command to >lower down the ad for the redistributed routes.. checked I thought>that should more or less has done the magic automatically.. but I keep>getting routing loops for routes coming from the rip domain.. after some >time i realized that whenever a r!
oute is added in the rip domain, the>route is looping between !
r3, r4,
r5.. further i realized that the route>propagation in RIP is much slower than redistributing from >rip->eigrp100->eig!> rp200->rip.. so when the route is ready to be redistributed from>eigrp200->rip at R4, the higher ad rip route (as compared to eigrp>external) did not reach R4 yet to stop it.. and I was careless enough >to put "redistribute eigrp 200 metric 1" under rip, which make it a>prefer rip route from R3 since metric is low. The solution guide does>use metric 10 on R4 and R5, but on R3, it uses metric 1 also. I am >thinking that this can also cause a problem when bb2 advertise new rip>routes or reload, as r5->rip->ospf->eigrp200->eigrp100->r3 could still>go faster than R5->rip->R3. I did not have a time to test this out >though.. will try that later..>> Changing the metric to a higher value when redistributing to rip will>work around this issue, but it does not seem to be a complete solution.>The fact is: for a short period of time, the routes are feed bac!
k to rip >domain where is originates. Another problem is: the rip metric can't>really go too high.>> I can't think of a way to use tag either.. tags are overridden, and>in this lab there is so many point of redistribution. Is there a way to >append the tag like the AS path does in bgp? Or any other way to better>address this problem? Thanks for the advise.>>Best regards,>Li Xiao>_________________________________________________________________ >Get your free suite of Windows Live services!>http://www.get.live.com/wl/all>>_______________________________________________________________________ >Subscription information may be found at:>http://www.groupstudy.com/list/CCIELab.html>>_______________________________________________________________________ >Subscription information may be found at:>http://www.groupstudy.com/list/CCIELab.html_________________________________________________________________ Charla con tus amigos en lmnea mediante MSN Messenger:http://messenge!
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