From: Narbik Kocharians (narbikk@gmail.com)
Date: Fri May 09 2008 - 19:04:21 ART
If you mean the area has two more ABRs, then you can control that by
using the following:
By default, the cost of the default route that's injected by the ABR
is 1; this can be verified by "Show ip ospf", and Show ip route. The
cost of the default route can be changed by "area xx default-cost cc",
where xx is the area number, and cc is the desired cost. I hope this
helps
On 5/9/08, Geert Nijs <Geert.Nijs@simac.be> wrote:
> Yes. I understand that in any router in the stub area there will only be the
> type 3 lsa default.
> But what about on the ABR itself ?
>
> regards,
> Geert
> ________________________________________
> From: Mike Harrison [michael.h4@blueyonder.co.uk]
> Sent: 09 May 2008 22:04
> To: Geert Nijs; ccielab@groupstudy.com
> Subject: Re: OSPF area question
>
> Geert
>
> Type 5 lsas wouldnt be allowed in a stub area ? The default route would be a
> type 3 lsa and therefore always an inter area route.
>
> Mike
>
> ----- Original Message -----
> From: "Geert Nijs" <Geert.Nijs@simac.be>
> To: <ccielab@groupstudy.com>
> Sent: Friday, May 09, 2008 4:01 PM
> Subject: OSPF area question
>
>
>> Hi group,
>>
>> I was wondering how an OSPF router would react in the following case.
>> Suppose you have an ABR router between area 0 and area 1100 (stub
>> no-summary area).
>> This router generates a default route into area 1100 as an intra-area
>> route.
>>
>> Suppose this router also receives a default route from area 0 as an
>> External route (LSA 5).
>> What will be put in the routing table of this ABR ? The OSPF database
>> would look like:
>>
>>
>> Summary Net Link States (Area 1100)
>>
>> Link ID ADV Router Age Seq# Checksum
>>
>> 0.0.0.0 10.216.157.1 1334 0x80006654 0x0061A1
>>
>> 0.0.0.0 10.216.157.2 1336 0x800074D3 0x003242
>>
>>
>>
>> Type-5 AS External Link States
>>
>> Link ID ADV Router Age Seq# Checksum Tag
>>
>> 0.0.0.0 192.168.1.32 1238 0x80012829 0x0057F8 1
>>
>> 0.0.0.0 192.168.1.43 1513 0x80008D14 0x0013E2 1
>>
>>
>>
>> The router should put the external in its routing table (and probably
>> will), but
>>
>> doesn't a summary (intra-area) take precedence over an external link
>> (inter-area) ?
>>
>> Or will the router see that the summary intra-area route is generated by
>> itself
>>
>> and therefore not put it in the routing table (avoiding blackholing) ?
>>
>> What if there is a redundant router present also advertising this default,
>> maybe
>>
>> it will except this one over the external ones ?
>>
>>
>>
>> regards,
>>
>> Geert
>>
>> ________________________________
>> disclaimer : http://webservices.simac.be/disclaimer.htm
>>
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html
>>
>>
>>
>>
>>
>>
>
> disclaimer : http://webservices.simac.be/disclaimer.htm
>
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
-- Narbik Kocharians CCSI#30832, CCIE# 12410 (R&S, SP, Security) www.Net-Workbooks.com Sr. Technical Instructor
This archive was generated by hypermail 2.1.4 : Mon Jun 02 2008 - 06:59:16 ART