From: Chris Gray (chris.gray@ozonenetworks.net)
Date: Sun Jun 01 2008 - 14:49:47 ART
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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