Thanks again Mr.Joe for your helpfull notes and next time each question will be
in different email.
What you said was right , there was no "ONLY" , I checked it again. Because the
redistribution task happened first , so it won't be noticed.
So,I will continue on this question in this email.
Regarding the summarization rule , i think this is applied to other routing
protocols as well. Plz Correct me if it's not right.
For example OSPF, an ospf router can't advertise an external summary route into
ospf until it has it into its routing table from a differnet routing protocol.
And if we add the suimmary-address into ospf process ,it won't be appeared in
other ospf routers.
Regards.
Date: Wed, 22 Jul 2009 18:27:09 -0400
Subject: Re: [OSL | CCIE_RS] VOL3 LAB7 OSPF Filtering - question to the experts
From: [email protected]
To: [email protected]
CC: [email protected]; [email protected]
As a followup -- This is correct. RIP needs at least one of the "child" routes
in the RIP database. Could could redistribute from EIGRP --> RIP and then do
the summary in RIP only but it really makes no difference. There is no
requirement to ONLY do the summarization in RIP. So at the end of the day, it
is your preference.
On Wed, Jul 22, 2009 at 6:22 PM, Joe Astorino <[email protected]> wrote:
Hi Khaled,
First, if you put your questions that are different from the main thread in a
new thread it will help everybody. It is easier to find if needed later, and
if other people are reading the topics, it is easier for them as well. At any
rate, I like the way you think, but the question does not say "only" RIP
routers. It just says RIP routers.
Secondly, with RIP summarization I believe that in order to create the summary
route and advertise it in RIP at least one of the routes must be in the routing
table as a RIP route. In this case those are EIGRP routes. I need to lab this
up to verify (or if anybody else does let me know) but that seems to be the
case according to the following docs:
http://www.cisco.com/en/US/docs/ios/12_2/ip/configuration/guide/1cfrip.html#wp1001151
"The ip summary-address rip router configuration command causes the router to
summarize a given set of routes learned via RIP Version 2 or redistributed into
RIP Version 2. "
2009/7/22 khaled Saholy <[email protected]>
Thanks Joe for your clarification.
Another small question,
In task 3.7, the question asks for RIP routers to see a single summary route
for routes coming from BB2. By doing summarization into EIGRP for the path
toward RIP
,not only RIP routers will see the summary only for routes from BB2 , but
EIGRP routers as well will only see the summary while in the question asked for
RIP routers only?
Shouldn't it be done on CAT1 and on R7 facing RIP domain?
Should I be more specific about the solution?
I hope my explanation is clear.
I appreciate your kind support.
Khaled Al-Saholy
Date: Wed, 22 Jul 2009 15:40:39 -0400
Subject: Re: [OSL | CCIE_RS] VOL3 LAB7 OSPF Filtering - question to the experts
From: [email protected]
To: [email protected]
CC: [email protected]; [email protected]
Yes. In a link-state protocol like OSPF the link-state database must be
identical on all the routers in an area. Therefore, when you use the
distribute-list in command in OSPF what actually happens is you filter between
the OSPF database and the RIB. The router still gets the information and has
it in the link-state database.
On Wed, Jul 22, 2009 at 3:39 PM, Bodnar, Edward <[email protected]>
wrote:
Ill have to check this out. Thanks Joe.
So I guess technically a distribute-list prevents routs from getting into the
rib not from the router receiving them?
Ed,
From: Joe Astorino [mailto:[email protected]]
Sent: Wednesday, July 22, 2009 3:35 PM
To: Bodnar, Edward
Cc: khaled Saholy; [email protected]
Subject: Re: [OSL | CCIE_RS] VOL3 LAB7 OSPF Filtering - question to the experts
Guys be extremely careful with the distribute-list command in OSPF. Check out
this FAQ from Cisco for more information. Remember, it is link-state so the
LSDB must be the same across the area!
http://www.cisco.com/en/US/tech/tk365/technologies_q_and_a_item09186a0080094704.shtml#q12
On Wed, Jul 22, 2009 at 3:28 PM, Bodnar, Edward <[email protected]>
wrote:
I would say as long and you look in your route table and you only see odd routs
then your ok. As long as they are not requiring you to use a “prefix-list”
you can do anything that works.
I always try to do the easy way unless I am forced not to. Standard ACL’s
matched with distribute-list are what I use unless I have a reason not to.
Ed,
From: [email protected]
[mailto:[email protected]] On Behalf Of khaled Saholy
Sent: Wednesday, July 22, 2009 3:23 PM
To: [email protected]
Subject: [OSL | CCIE_RS] VOL3 LAB7 OSPF Filtering - question to the experts
Dear Experts,
I have some questions regading the VOL3 labs. So I'll start with lab7.
In lab 7 , task 3.5 , the task is asking for R9 to receive only even routes
from BB2 via serial 0/2/0 only and the odd routes via serial 0/2/1 only. The
solutions in the proctor guide has been configured in R6 with two long
prefix-lists. I did the configuration in R9 with the (distribute-list in) with
the access-lists and it gave me the same result.
Is my solution correct ?
Thanks for the reply in advance.
Khaled Al-Saholy
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Joe Astorino - CCIE #24347 R&S
Technical Instructor - IPexpert, Inc.
Cell: +1.586.212.6107
Fax: +1.810.454.0130
Mailto: [email protected]
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Regards,
Joe Astorino - CCIE #24347 R&S
Technical Instructor - IPexpert, Inc.
Cell: +1.586.212.6107
Fax: +1.810.454.0130
Mailto: [email protected]
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Regards,
Joe Astorino - CCIE #24347 R&S
Technical Instructor - IPexpert, Inc.
Cell: +1.586.212.6107
Fax: +1.810.454.0130
Mailto: [email protected]
--
Regards,
Joe Astorino - CCIE #24347 R&S
Technical Instructor - IPexpert, Inc.
Cell: +1.586.212.6107
Fax: +1.810.454.0130
Mailto: [email protected]
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