RE: Summarizing LSA-3 in ospf

From: Joseph Brunner (joe@affirmedsystems.com)
Date: Fri Aug 15 2008 - 09:19:54 ART

If you do

 

area 0 range 6.6.0.0 <http://6.6.0.0/> 255.255.252.0
<http://255.255.252.0/> not-advertise

 

does an internal router in area 2 still see the summary?

 

What IOS version are you using?

 

Thanks,

 

Joe

 

  _____

From: Fahad Khan [mailto:fahad.khan@gmail.com]
Sent: Friday, August 15, 2008 5:01 AM
To: Joseph Brunner
Cc: akyccie; Cisco certification
Subject: Re: Summarizing LSA-3 in ospf

 

ABR1 -

 

R1#sh run | s ospf
router ospf 1
 log-adjacency-changes
 network 6.6.0.1 <http://6.6.0.1/> 0.0.0.0 <http://0.0.0.0/> area 1
 network 6.6.1.1 <http://6.6.1.1/> 0.0.0.0 <http://0.0.0.0/> area 1
 network 6.6.2.1 <http://6.6.2.1/> 0.0.0.0 <http://0.0.0.0/> area 1
 network 6.6.3.1 <http://6.6.3.1/> 0.0.0.0 <http://0.0.0.0/> area 1
 network 10.0.0.1 <http://10.0.0.1/> 0.0.0.0 <http://0.0.0.0/> area 0

 

ABR2 -

 

R2#sh run | s ospf
router ospf 1
 log-adjacency-changes
 area 0 range 6.6.0.0 <http://6.6.0.0/> 255.255.252.0
<http://255.255.252.0/>
 network 7.7.0.1 <http://7.7.0.1/> 0.0.0.0 <http://0.0.0.0/> area 2
 network 10.0.0.2 <http://10.0.0.2/> 0.0.0.0 <http://0.0.0.0/> area 0

 

Show ip route ospf @ ABR2

 

R2#sh ip route ospf
     6.0.0.0/32 is subnetted, 4 subnets
O IA 6.6.1.1 <http://6.6.1.1/> [110/65] via 10.0.0.1 <http://10.0.0.1/>
, 00:01:38, Serial1/0
O IA 6.6.0.1 <http://6.6.0.1/> [110/65] via 10.0.0.1 <http://10.0.0.1/>
, 00:01:38, Serial1/0
O IA 6.6.3.1 <http://6.6.3.1/> [110/65] via 10.0.0.1 <http://10.0.0.1/>
, 00:01:38, Serial1/0
O IA 6.6.2.1 <http://6.6.2.1/> [110/65] via 10.0.0.1 <http://10.0.0.1/>
, 00:01:38, Serial1/0

 

show ip ospf database @ ABR2

 

R2#sh ip ospf database

            OSPF Router with ID (197.168.3.1 <http://197.168.3.1/> )
(Process ID 1)

                Router Link States (Area 0)

Link ID ADV Router Age Seq# Checksum Link count
197.168.3.1 <http://197.168.3.1/> 197.168.3.1 <http://197.168.3.1/>
107 0x80000006 0x000D20 2
197.168.7.1 <http://197.168.7.1/> 197.168.7.1 <http://197.168.7.1/>
107 0x80000008 0x008E99 2

                Summary Net Link States (Area 0)

Link ID ADV Router Age Seq# Checksum
6.6.0.1 <http://6.6.0.1/> 197.168.7.1 <http://197.168.7.1/>
1023 0x80000001 0x008236
6.6.1.1 <http://6.6.1.1/> 197.168.7.1 <http://197.168.7.1/>
843 0x80000001 0x007740
6.6.2.1 <http://6.6.2.1/> 197.168.7.1 <http://197.168.7.1/>
833 0x80000001 0x006C4A
6.6.3.1 <http://6.6.3.1/> 197.168.7.1 <http://197.168.7.1/>
833 0x80000001 0x006154
7.7.0.1 <http://7.7.0.1/> 197.168.3.1 <http://197.168.3.1/>
111 0x80000001 0x008535

                Router Link States (Area 2)

Link ID ADV Router Age Seq# Checksum Link count
197.168.3.1 <http://197.168.3.1/> 197.168.3.1 <http://197.168.3.1/>
111 0x80000003 0x00FA40 1

                Summary Net Link States (Area 2)

Link ID ADV Router Age Seq# Checksum
6.6.0.1 <http://6.6.0.1/> 197.168.3.1 <http://197.168.3.1/>
106 0x80000001 0x00215B
6.6.1.1 <http://6.6.1.1/> 197.168.3.1 <http://197.168.3.1/>
110 0x80000001 0x001665
6.6.2.1 <http://6.6.2.1/> 197.168.3.1 <http://197.168.3.1/>
110 0x80000001 0x000B6F
6.6.3.1 <http://6.6.3.1/> 197.168.3.1 <http://197.168.3.1/>
110 0x80000001 0x00FF79
10.0.0.0 <http://10.0.0.0/> 197.168.3.1 <http://197.168.3.1/>
115 0x80000001 0x00354B

As you can see that there is no any summary entry in database table of Area
2.

 

On 8/15/08, Joseph Brunner <joe@affirmedsystems.com> wrote:

"kindly" post your configs.

I have used this identical config in my lab. And I was able to.

-Joe

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Fahad Khan
Sent: Thursday, August 14, 2008 3:03 PM
To: akyccie
Cc: Cisco certification
Subject: Re: Summarizing LSA-3 in ospf

No dear, I am unable to get the desired results. Kindly lab it for
confirming me. I came to know that, in the command "area <*id*> range" ,
this* id* must be the area id when these specific routes reside. I just
wanna know the logic, why i am unable to send the summary of OIA routes?

Thanks,

On 8/14/08, akyccie <akyccie@gmail.com> wrote:
>
> I guess you need use area range to summaries here.
>
> ----- Original Message ----- From: "Fahad Khan" <fahad.khan@gmail.com>
> To: "Cisco certification" <ccielab@groupstudy.com>
> Sent: Friday, August 15, 2008 12:18 AM
> Subject: Summarizing LSA-3 in ospf
>
>
> Hi Experts,
>>
>> Lets have a scenario,
>>
>> Area 1 and Area 2 both are connected to Area 0, So we have Two ABRs,
>>
>> ABR1 -- Connecting Area1 with Area 0
>>
>> ABR2 -- Connecting Area2 with Area 0
>>
>> The routes coming from Area 1 to Area 0 will be seen as OIA (LSA 3) on
>> ABR
>> 2. I *can not summarize* these routes and send a summary to Area 2 (by
>> configuring summary on ABR2).
>>
>> Why???? Why the algo is not permitting me? Plz shed light over the logic.
>>
>> Thanks for the help in advance.
>> regards,
>> --
>> *FAHAD KHAN
>>
>> BE Computer Systems NED,
>>
>> CCNA,CCDA,CCNP,FOUNDFE,CLSE,QOS,JNCIA,JNCIS,MCP,CCIE (Written)
>>
>> Systems Support Engineer, Premier Systems (Pvt) limited,
>>
>> Karachi, Pakistan
>>
>> 92-321-2370510.*
>>
>>
>> Blogs and organic groups at http://www.ccie.net <http://www.ccie.net/>
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>>
>>
>>
>>
>>
>>
>>
>>
>>
> 

--
*FAHAD KHAN

BE Computer Systems NED,

CCNA,CCDA,CCNP,FOUNDFE,CLSE,QOS,JNCIA,JNCIS,MCP,CCIE  (Written)

Systems Support Engineer, Premier Systems (Pvt) limited,

Karachi, Pakistan

92-321-2370510.*

Blogs and organic groups at http://www.ccie.net <http://www.ccie.net/>

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