From: Chris Gray (chris.gray@ozonenetworks.net)
Date: Mon Jun 02 2008 - 05:05:04 ART
Hi Lloyd - Thanks for persevering with me on this one. I could be missing
something basic but need a sanity check.
I perhaps have not explained it quite clearly enough. The scenario is:
All on same Router..
EIGRP 50 -> EIGRP 10 -> OSPF 20 (not 10 as typo'd previously)
I do not see EIGRP 50 in OSPF. When I look at Router tables all routes from
EIGRP 50 are owned by EIGRP 50 and therefore not EIGRP 10 and therefore do
not populate my OSPF network since I am only redistributing EIGRP 10.
If I check IP EIGRP 10 topology on all-links, I see the routes in Passive
state, not in main table.
No matter what I do, I cannot get these routes through.
Here is what I have tried.
Redistribute EIGRP 50 to EIGRP 10 with route map. On route map set metric to
very attractive values. E.g. BW 1Gig, no delay etc etc
Still in EIGRP 50 not 10. - shows in EIGRP 10 topology table as Passive.
On EIGRP 10 set distance for external routes to 85
Still in EIGPR 50 not 10. - shows in EIGRP 10 topology table as Passive.
On EIGRP 50 set Admin distance to 200 - period.
Still in EIGPR 50 not 10. - shows in EIGRP 10 topology table as Passive.
The principle I am seeing here, is that when redistributing from a routing
process , only the routes that are live in the routing process table are
redistributed, not those , in this example, in the topology table. I need
to break this rule somehow If I am to get complete redistribution..
Any thoughts - driving me nutts!
_____
From: Lloyd Ardoin [mailto:Lloyd@TheWizKid.biz]
Sent: 02 June 2008 02:31
To: kriz@ozonenetworks.net
Subject: RE: Redistribtiion from EIGRP process X to EIGRP Process Y
Hi Chris,
So you are doing EIGRP 50 -> EIGRP 10 -> OSPF? On that router only you
should have no issues with redistribution, only if you sent those routes out
to another router via EIGRP or OSPF and they come back from the other
routing protocol.
Are you saying that you don't see the routes you area redistributing from
EIGRP 50 into EIGRP 10?
EIGRP 10 and 50 will take care of each other by bringing in router from each
other as 170 so they will never prefer those routes over internal routes. On
the other hand if you send those external 170 router from EIGRP 10 to OSPF
and they propagate to an other OSPF router and then they come back via OSPF
110 the router will want to prefer the 110 over the 170s. Under OSPF you
could set the distance of those specific routes to 171 with the distance
command and a standard access list.
Lloyd V Ardoin
Network Engineer
MCSE, CCDA, CCNP, CCSP, GSEC, GCFW, GCWN, CISSP
_____
From: Chris Gray [mailto:chris.gray@ozonenetworks.net]
Sent: Sunday, June 01, 2008 12:50 PM
To: Lloyd Ardoin; 'Cisco certification'
Subject: RE: Redistribtiion from EIGRP process X to EIGRP Process Y
Thanks Lloyd.
Just getting hung up on a scenario I am working through.
I have routes incoming to my router through EIGRP 50 and populating the
routing table as we would expect.
I also have EIGRP 10 and routes there too.
Also running on the same router is OSPF process 20. This is my link to the
rest of the network.
I am performing redistribution between the 2 EIGRP processes 50 and 10.
My problem is that I am only allowed to redistribute out to OSPF from EIGRP
10 and therefore I am not catching the EIGRP 50 routes on the way out to
OSPF.
Currently working on setting distances on EIGRP 10 for external routes,, but
whatever I seem to do, the routes do not find themselves in EIGRP process 10
and therefore do not leave my router to OSPF 10.
Still working it though, but if you have any pointers, would be grateful..
Regards
_____
From: Lloyd Ardoin [mailto:Lloyd@TheWizKid.biz]
Sent: 01 June 2008 18:34
To: Chris Gray
Subject: RE: Redistribtiion from EIGRP process X to EIGRP Process Y
Hi Chris,
I may not understand your question correctly but mutual redistribution on
the same router will never cause a routing loop. It happens when you have
routers on the same network runing the same routing protocols. In other
words if R1 and R2 are both running RIP and OSPF and you redistribute them
mutually then the RIP routes will leave R1 from RIP going to OSPF on R2 and
then R2 will send them back to R1 via OSPF as 110 and visa versa. This
could potentially cause a routing loop. Route taging is definitely an option
along wtih distance and also sometimes you can adjust metrics. In this
scenario you could redistribute RIP into OSPF with a tag statement at the
end and then deny that tag into RIP on the other router. It is only when you
redestribute from a LOWER administrative distance into a HIGHER
administrative distance where the issue may occur.
HTH,
Lloyd V Ardoin
Network Engineer
Sagenet, LLC
918-270-7133
MCSE, CCDA, CCNP, CCSP, GSEC, GCFW, GCWN, CISSP
_____
From: Chris Gray
Sent: Sun 6/1/2008 12:12 PM
To: 'Cisco certification'
Subject: Redistribtiion from EIGRP process X to EIGRP Process Y
Hi all,
Just a general question here.
I see a few practice labs where we are asked to redistribute from one
process of an IGP (say EIGRP) to another on the same router. Say, mutual
redistribution between EIGRP 5 and EIGRP 10.
For best practice I usually guard against routing loops by using tags to
mark the origin of the traffic and block it a second time round.
Has anyone got any thoughts on this. Am I missing a distance related issue
here?
Kriz
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