From: Nodir Nazarov (nodir@xxxxxxxxxxxx)
Date: Wed Feb 28 2001 - 13:45:17 GMT-3
Slattery/Burton example says (not exactly - I don't have book with me
now - but very close) that I have to have on R4
router ospf 1
redistribute eigrp 10 metric 100 subnets
network 172.16.42.4 0.0.0.0 area 0
distribute-list 4 out <-----------------------------
!
access-list 4 deny 172.16.0.0
access-list 4 permit any
I configured everyhing without distribute list and I expected routing
anomalies and wanted to observe it.
R5 and R7's as well as R1 and R3's routing table are fine (meaning, they
show proper sources, AD and metrics for routes).
My original question was - why do I need this distribute-list on R4 ?
Nodir
On Wed, 28 Feb 2001, Chuck Larrieu wrote:
> The AD for EIGRP is 90. Externally injected routes would have an AD of 170
>
> The AD for OSPF routes is 110
>
> If you have the no auto-summary in place on the EIGRP routers, and you see
> the summary route, it is coming in from OSPF as an EX route.
>
> The routing table on R4 is not going to be very helpful in determining what
> is coming and going from where. Two routing protocols. Lots of things
> happening.
>
> Check R5 or R7 - what do those tables show you?
>
> Check R1 or R3 - what do those tables show you?
>
> I do have a question. I am probably misunderstanding you, but why do you
> want EIGRP routes to be redistributed back into EIGRP from OSPF?
>
> Chuck
>
> -----Original Message-----
> From: Nodir Nazarov [mailto:nodir@datatone.com]
> Sent: Wednesday, February 28, 2001 8:16 AM
> To: Chuck Larrieu
> Cc: ccielab@groupstudy.com
> Subject: RE: slattery/burton, advanced ip, redistr. ex.10
>
>
> I reproduced that scenario from the book:
>
> R1 R3 OSPF domain
> \ /
> R6
> |
> R2
> |
> R4 <------------- mutual redistribution
> / \
> R5-R7 EIGRP domain
>
>
> I tried to do different things but I can't get EIGRP routes to be injected
> back to EIGRP from OSPF. EIGRP summary: 182.18.0.0/16, OSPF summary:
> 172.16.0.0/16.
>
> How do I observe that summaries are being redistributed from EIGRP to
> OSPF and "bad routes" - back to EIGRP ? I can't justify filtering out OSPF
> summary when it redistributes EIGRP.
>
> Please help !
> Nodir
>
>
>
>
>
>
>
>
> On Tue, 27 Feb 2001, Chuck Larrieu wrote:
>
> > The purpose of the distribute-list 4 is to prevent the eigrp summary
> router
> > 172.16.0.0 from being redistributed back into the eigrp process from the
> > ospf process.
> >
> > My recollection is that in general there were problems with the solution
> > provided. Artifact routes. Routes disappearing.
> >
> > Wait - here it is - my notes from a lab I did on this scenario. Issue -
> > distribute list did not solve the problem of the "phantom summary
> > 182.18.0.0" being redistributed back into eigrp. I needed a route map to
> do
> > so.
> >
> > Also, you might want to take a peek at the archives for the month of
> > January. There were several good posts from Nigel on this particular
> > scenario .
> >
> > I vaguely recall doing this scenario a couple of times, and in one try
> > finding that if I filtered out the summary, then one routing domain or the
> > other was hosed. Can't locate notes. Is this what you are seeing?
> >
> > Chuck
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> > Nodir Nazarov
> > Sent: Tuesday, February 27, 2001 7:57 PM
> > To: ccielab@groupstudy.com
> > Subject: slattery/burton, advanced ip, redistr. ex.10
> >
> >
> > Hello, The Group,
> >
> > This question is regarding Example 10 of redistribution on Slattery/Burton
> > "Advanced IP routing..."
> >
> > Can anybody explain me (who did this example) what is practical
> > significance of "distribute-list 4 out" on NewYork router (example 10,
> > page 372, line 33). Everything has been relatively smooth until this
> > "distribute-list". I was sure I did not need it.
> >
> > Thank you,
> > Nodir
> >
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