From: Perminder Grewal (percy_gunner@xxxxxxxxxxx)
Date: Fri May 03 2002 - 04:04:25 GMT-3
Sorry R2 is an ABR/ASBR the ethernet is in area 12.
Percy
>From: "Perminder Grewal" <percy_gunner@hotmail.com>
>Reply-To: "Perminder Grewal" <percy_gunner@hotmail.com>
>To: kyeung@hkcix.com, ccielab@groupstudy.com
>Subject: Re: Solie's P.791 confusion.((BIG HELP)
>Date: Fri, 03 May 2002 06:17:03 +0000
>
>Can anyone help
>
>
>I tried this scenario in my lab yesterday the basic set up is the same as
>yours.
>
>> R4
>> |s0
>> |
>> --s0.1---| R1---|e0
>>|e0-R3< /
>> --s0.2---------<
>> \
>> R2---|e0
>
>
>1) the frame is a /29 area 0 (r3 r2 r1)
>2) R1 and R2 are ABR area 0 and area 1 (e0) /25
>3) R3 to R4 is a /24 igrp. ASBR (area 0 and IGRP)
>
>A) I can summarise the /25 to a /24 and the routers R1 and R2 have a null0
>in the route table and R4 gets the /24 from area 1.
>
>B) I've done the same on R3 summarise /29 to a /24 this does not put in a
>null0 in the R3 route table and in doing so does not advertise that prefix
>to R4.
>
>Solution??????
>
>I tried the the summ on R1 and R2 for area 0 it puts in the /24 nullO in
>there route table but R3 does not have it and in doing so does not
>advertise
>to R4.
>
>I got over the problem by including a static route /24 in R3 to null0 and
>then redistributed that static to in IGRP in doing so R4 gets the /24 for
>area.
>
>If anyone can shed any light, please let me know. I tried every combo last
>night and could only do this by the static method.
>
>
>Cheers
>
>Percy
>
>
>
>
>>From: Katson PN Yeung <kyeung@hkcix.com>
>>Reply-To: Katson PN Yeung <kyeung@hkcix.com>
>>To: ccielab@groupstudy.com
>>Subject: Solie's P.791 confusion.
>>Date: Fri, 03 May 2002 09:29:31 +0800
>>
>>Dear group,
>>
>>I have a question about Solie's book P.791.
>>
>>On the 2nd paragraph from the top, it saids:
>>"You cannot summarize Area 0 or the backbone area. All summaries are
>>flooded into area 0 and then are flooded out from that point. Therefore
>>Area 0 routes cannot be summarized"
>>
>>However, in the scenario such as below:
>>
>> R4
>> |s0
>> |
>> --s0.1---| R1---|e0
>>|e0-R3< /
>> --s0.2---------<
>> \
>> R2---|e0
>>
>>Where R3s0.2, R1s0, and R2s0 forming OSPF area 0 (/28 subnet)
>>- R1e0 area 1 (/24)
>>- R2e0 area 2 (/24)
>>- R3e0 being area 3 (/24 or whatever)
>>- R3 s0.1 and R4 running igrp (/24)
>>
>>Isn't it easy (and convenient) to create a /24 summary route by "area 0
>>range x.x.x.x 255.255.255.0" at R3, and then get it redistributed to igrp?
>>I did they before since the redis connected/summary ASBR method doesn't
>>work now.
>>
>>Solie P.791 makes me confused. Can someone clarifies if this "area 0
>>range" method is "okay to use" in the real lab environment?
>>
>>Or just like someone saids, tunnel method, sec interface method? or even
>>piggy-back OSPF
>>method are the more preferable way to make a /24 summary route?
>>
>>Thanks a lot.
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