RE: Summarizing LSA-3 in ospf

From: Scott Morris (smorris@internetworkexpert.com)
Date: Sat Aug 16 2008 - 16:00:05 ART

And on the ABR representing the more specific O routes, you may summarize
them with an area-range command into your supernet. Whether a supernet or
the same prefix as the O routes, once they cross to another area they become
Summary-LSAs (type 3) and O IA.

HTH,

Scott

-----Original Message-----
From: Fahad Khan [mailto:fahad.khan@gmail.com]
Sent: Saturday, August 16, 2008 12:54 PM
To: smorris@internetworkexpert.com; swm@emanon.com; Ibrahim kabir; Cisco
certification
Subject: Re: Summarizing LSA-3 in ospf

Sir,thank u very much 4 the last post.i ve some more queries,hope not
bothering u.."summary lsa" and "summary route",are these the names of same
thing? I saw the prefixes as "O " in the native area,but in the other area i
saw them as "OIA" with no change in the prefix length.now i want to perform
supernetting of "OIA" routes.can i??if i m not mistaken ,they r called
"summary LSAs" not summarized routes.

On 8/16/08, Scott Morris <smorris@internetworkexpert.com> wrote:
> Your inter-area routes are already summarized (hence the name Summary
LSA!).
> :)
>
> You can do a total stub area, and make everything reachable througgh a
> default route if you are interested. So you'd need to consider how
> routes are already summarized and where they are summarized (ABRs
> only) to make some sense through what does or what does not summarize!
>
> I would suggest setting up a few simple areas on routers and start
> practicing summarization. Once you get The Type1 and Type2's
> summarized (intra area) try to expand your summary to include some
neighboring type 3
> lsa's and see what happens! That's really the way that will solidify
> things in your head!
>
> Cheers,
>
> Scott
>
> _____
>
> From: Fahad Khan [mailto:fahad.khan@gmail.com]
> Sent: Saturday, August 16, 2008 10:35 AM
> To: swm@emanon.com
> Cc: smorris@internetworkexpert.com; Ibrahim kabir; Cisco certification
> Subject: Re: Summarizing LSA-3 in ospf
>
>
> Thank you very much Sir, Is there any to summarize "inter-area" routes?
>
>
> On 8/16/08, Scott Morris <swm@emanon.com> wrote:
>
> Correct.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of Fahad Khan
> Sent: Saturday, August 16, 2008 9:49 AM
> To: smorris@internetworkexpert.com
> Cc: Ibrahim kabir; Cisco certification
> Subject: Re: Summarizing LSA-3 in ospf
>
> Sir,
>
> Area-range is used for summarizing "intra-area" routes. right?
>
>
> On 8/16/08, Scott Morris <smorris@internetworkexpert.com> wrote:
>>
>> Area-range is for internal routes. Summary-address is for external
> routes.
>>
>> HTH,
>>
>>
>> Scott Morris, CCIE4 #4713, JNCIE-M #153, JNCIS-ER, CISSP, et al.
>> CCSI/JNCI-M/JNCI-ER
>> Senior CCIE Instructor
>>
>> smorris@internetworkexpert.com
>>
>>
>>
>> Internetwork Expert, Inc.
>> http://www.InternetworkExpert.com
>> Toll Free: 877-224-8987
>> Outside US: 775-826-4344
>>
>> Knowledge is power.
>> Power corrupts.
>> Study hard and be Eeeeviiiil......
>>
>>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
>> Of Ibrahim kabir
>> Sent: Saturday, August 16, 2008 8:11 AM
>> To: Fahad Khan; Cisco certification
>> Subject: RE: Summarizing LSA-3 in ospf
>>
>> Fahad,
>>
>> Wich command did you use? area x range or summary-address. I think
>> the area x range command should work fyn for you.
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>
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> *FAHAD KHAN
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>
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>
> 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.
> 

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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

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