From: Chuck Larrieu (chuck@xxxxxxxxxxxxx)
Date: Sat Jan 20 2001 - 16:34:19 GMT-3
Hey, Tony. How's things?
My concern with using the summary-address command for the OSPF originated
routes within the OSPF process was that I would then propagate the OSPF
summary in addition to the regular OSPF routes. I just now looked at the
command reference and configuration guide, both of which are a bit vague as
to what the command really does. The problem with labs using small numbers
of routers is that you run into situations where your backbone router is
also your ASBR, and so you have to use commands in situations you might not
ordinarily use them.
As I was using my favorite rent-a-rack and one of the Slattery exercises
when doing this, I plain ran out of time before I could gather my wits try a
couple of different options.
What I have now on my to-try list is:
1) Verify the direction that the redistribute [list#] out [routing_process]
takes.
2) Verify the options within the ospf process summary-address command. Check
to see which direction it takes
3) Try a couple of different variations of the access-list
4) Take some time to explore the options under the summary-address command
and the distribute-list command and document them.
These are all things I can do with my own routers, without having to rent
time, so I'll be looking at this again tonight, and I will report my
results.
Thanks, everyone.
Chuck
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Tony
Medeiros
Sent: Saturday, January 20, 2001 11:09 AM
To: Chuck Larrieu; CCIE_Lab Groupstudy List
Subject: Re: Distribute-List vs Route-Map issues
Chuck,
Try the summery-address command under ospf calling the summery that you want
advertised in eigrp. In ospf, you must create the summery and it should
automaticly filter the more specific routes. It works just like the
"area-range" command only "summery-address" is used between routing domains
and "area-range" is for summeries between ospf areas.
If the networks specified in the summary-address are external to the
OSPF domain, it will summarize them when redistributing INTO OSPF.
If the networks specified in the summary-address are internal to the
OSPF domain, it will summarize them when redistibuting FROM OSPF into
another routing protocol.
Hope this helps
Tony Medeiros
----- Original Message -----
From: "Chuck Larrieu" <chuck@cl.cncdsl.com>
To: "CCIE_Lab Groupstudy List" <ccielab@groupstudy.com>
Sent: Saturday, January 20, 2001 7:55 AM
Subject: Distribute-List vs Route-Map issues
> Two routing domains. Single redistribution point. Requirement for
> summarization out of each domain into the other.
>
> EIGRP-----ASBR-----OSPF
> 182.18.0.0 172.16.0.0
>
> ASBR configs ( partial )
>
> Router eigrp 200
> Netw 182.18.0.0
> Redist ospf 300 metric etc
>
> Router opsf 300
> Netw ( several statements )
> Redist eigrp 200 metric etc subnets
>
> Without any additional configuration, everything behaves as I expect. All
> routes are appearing in each domain
>
> To summarize the eigrp routes, I add the statement summary-address
> 182.18.0.0 255.255.0.0
>
> Again, behaviour is as I expect. The summary appears throughout the OSPF
> domain as it should. And it is leaked back into the eigrp domain, which I
> expect because there is no filtering.
>
> Now here is where it gets frustrating.
>
> Access-list 1 permit 172.16.0.0 0.0.255.255
>
> Distribute-list 1 out eigrp 200 ( under the ospf process )
>
> This does not work. the 182.18.0.0 summary address appears throughout the
> eigrp domain, after clear ip route * everyplace I can think of. It does
not
> appear to be artifact from earlier configurations. Oh- also the summary
> route disappears f the ospf domain as well.
>
> If I take that same access list and use it in a route map
>
> Route-map ospf-eig permit 10
> Match ip address 1
>
> And then make the appropriate modifications under the ospf process, the
> summary disappears. ( there were a couple of variations of access-lists
and
> distribute-lists I tried, btw, both in eigrp and ospf. Similar results )
>
> Anyone know what gives?
>
> I see from book examples that folks tend not to use distribute-list
> options. I could not find any caveats in the documentation, but you know
how
> that goes. ;->
>
>
> Chuck
> http://www.1112.net/lastpage.html
>
>
>
>
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