From: Ajay Prakash (ajay.prakash@networkpeople.co.in)
Date: Thu Jun 14 2007 - 14:51:49 ART
Thanks Tony and Marko for your replies.
Well, I am just trying to find if there is a way to change the P-bit while
redistributing, and that too just out of curiosity. From the article it
seems that although the P-bit exists but we cannot change it through an IOS
command.
Thanks again for your replies :)
Ajay
----- Original Message -----
From: "Marko Milivojevic" <markom@vodafone.is>
To: "Cisco certification" <ccielab@groupstudy.com>
Sent: Thursday, June 14, 2007 6:57 PM
Subject: RE: How to set the P-bit
>[ http://www.cisco.com/warp/public/104/9.html#q27 ]
>
> Q. Can I control the P-bit when importing external routes into a
> not-so-stubby area (NSSA)?
>
> A. When external routing information is imported into an NSSA in a type 7
> link-state advertisement (LSA), the type 7 LSA has only area flooding
> scope. To further distribute the external information, type 7 LSAs are
> translated into type 5 LSAs at the NSSA border. The P-bit in the type 7
> LSA Options field indicates whether the type 7 LSA should be translated.
> Only those LSAs with the P-bit set are translated. When you redistribute
> information into the NSSA, the P-bit is automatically set. A possible
> workaround applies when the Autonomous System Boundary Router (ASBR) is
> also an Area Border Router (ABR). The NSSA ASBR can then summarize with
> the not-advertise keyword, which results in not advertising the translated
> type 7 LSAs.
>
>
> Another approach that could be of some use is to configure "OSPF Inbound
> Filtering Using Route Maps":
>
> http://www.cisco.com/univercd/cc/td/doc/product/software/ios124/124cg/hirp_c/ch15/hroutma.htm
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Ajay Prakash
> Sent: 14. jznm 2007 13:03
> To: Cisco certification
> Cc: Ajay
> Subject: How to set the P-bit
>
> Hello,
>
> Is there is way to change the P-bit while distributing External routes
> into
> OSPF NSSA so that the type 7 LSA does not cross the ABR to the rest of the
> OSPF AS as a type 5 LSA? The book i reffered to says that the P-bit is
> automatically set to 1 while re-distributing into NSSA. How can we change
> this
> default behaviour?
>
> Thanks :)
>
> Ajay
>
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