Yupe...Thanks a lot :)
if these kinds of questions in the open ended....I don't know if it will be
fair or not...too tricky ...at the end the route reached the last hop router
and we know that Type7 to 5 conversion happened..what else we need
the question I always think about is to which level of details we need to
study ( I don't mean in particular this example but in general ) ...10 days
to find the answer for my question
----- Original Message -----
From: Narbik Kocharians
To: Mohamed El Henawy
Cc: Molomo ; Rick Mur ; ccielab_at_groupstudy.com
Sent: Monday, September 07, 2009 1:15 AM
Subject: Re: LSA Type 4 again
Perfect. Do you see now how it works?
On Sun, Sep 6, 2009 at 2:12 PM, Mohamed El Henawy <m.henawy_at_link.net>
wrote:
i did it
output from R1 when Area 1 is normal area
OSPF Router with ID (10.10.10.10) (Process ID 1)
Summary ASB Link States (Area 0)
Routing Bit Set on this LSA
LS age: 46
Options: (No TOS-capability, DC, Upward)
LS Type: Summary Links(AS Boundary Router)
Link State ID: 22.22.22.22 (AS Boundary Router address) ===> R3
Advertising Router: 1.1.1.1
LS Seq Number: 80000001
Checksum: 0x6F6F
Length: 28
Network Mask: /0
TOS: 0 Metric: 1
output when Area 1 is NSSA
OSPF Router with ID (10.10.10.10) (Process ID 1)
----- Original Message -----
From: Narbik Kocharians
To: Mohamed El Henawy
Cc: Molomo ; Rick Mur ; ccielab_at_groupstudy.com
Sent: Monday, September 07, 2009 12:07 AM
Subject: Re: LSA Type 4 again
It will be easy to lab it up.
R1 ------ Area 0 ------ R2 ------ Area 1 ------- R3
Set area 1 to nssa and configure R3 to redistribute a connected
interface. Then, do a "Show ip ospf da asbr-summ" on R1. Then try it again
without having Area 1 as NSSA and see the difference.
On Sun, Sep 6, 2009 at 1:03 PM, Mohamed El Henawy <m.henawy_at_link.net>
wrote:
Hello Molomo ,
can you plz share the output of the show ?
----- Original Message ----- From: "Molomo" <letjedilakopa_at_gmail.com>
To: "Rick Mur" <rmur_at_ipexpert.com>
Cc: <ccielab_at_groupstudy.com>
Sent: Sunday, September 06, 2009 5:50 PM
Subject: Re: LSA Type 4 again
Rick,
Actually I did lab it and it was not permitted,
R1---area 1--- R2 ---area 0 --- R3 --area 0--- R4--- area 2--- R5
area 0 backbone
area 1 normal area
area 2 is nssa
R5 ASBR
on R1 I cannot see the LSA type 4.
Regards,
Molomo
On Sun, Sep 6, 2009 at 4:43 PM, Rick Mur <rmur_at_ipexpert.com> wrote:
It could be allowed in the NSSA area, but it would have no use.
You are correct, the ABR generates a type 4 LSA, when it sees type
5 LSA's
indeed to describe the location of the ASBR.
Try to lab it up. Create a topology, insert some external routes
in OSPF
and issue a 'show ip ospf database' on a router within the NSSA
and see if
you have a type-4 in your database. It's always good to see the
theory
being
confirmed in a lab, at least that is what helps me to understand
and
remember the theory.
--
Regards,
Rick Mur
CCIE2 #21946 (R&S / Service Provider)
Sr. Support Engineer IPexpert, Inc.
URL: http://www.IPexpert.com <http://www.ipexpert.com/>
On 6 sep 2009, at 16:27, Molomo wrote:
Experts,
Jeff Doyle says LSA type 4 is allowed in nssa area ( see table
below). I
would have thought that since LSA 5 is not permitted then no
need to
generate LSA 4.
My understanding is , ABR generates LSA 4 based on the type 5,
to describe
the position of the ASBR.
Or am I missing something here?
I have also seen this in Quick Reference Sheet by Anthony
Sequeira.
Table 8-5. LSA types allowed per area type.
Area Type
1&2
3
4
5
7
Backbone (area 0)
Yes
Yes
Yes
Yes
No
Non-backbone, non-stub
Yes
Yes
Yes
Yes
No
Stub
Yes
Yes
No
No
No
Totally stubby
Yes
No[*]<mk:@MSITStore:C:\Documents%20and%20Settings\user\Desktop\R&S%
20CCIE\Rec
ommended%20Reading\Books\Cisco%20press\Jeff%20Doyle\CCIE_Profession
al_Develop
ment_Routing_TCPIP,_Volume_I,_Second_Edition.chm::/1587052024/ch08l
ev1sec1.ht
ml#ch08tn01>
No
No
No
Not-so-stubby
Yes
Yes
Yes
No
Yes
[*] Except for a single type 3 LSA per ABR, advertising the
default route
Regards,
Molomo
Blogs and organic groups at http://www.ccie.net
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Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
Sr. Technical Instructor
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Narbik Kocharians
CCSI#30832, CCIE# 12410 (R&S, SP, Security)
www.MicronicsTraining.com
Sr. Technical Instructor
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Received on Mon Sep 07 2009 - 00:27:31 ART
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