[j-nsp] JNCIP book, ISIS and BGP Q!

[Steve Steiner]

There's 2 things here.  1) The configuration scenario for the misc. knobs
where you ignore the ISIS attached bit, and 2) the end-of-chapter ISIS case
study.

When you get to iBGP, you are instructed to use the ISIS end-of-chapter case
study as the baseline for iBGP.  In that case study, there are no
requirements to use the "ignore-attached-bit" knob, meaning that R2 *will*
get a default route from R3 and R4. We know this because of the task:


   - lo0 addresses are reachable through IS-IS for all routers with an IS-IS
   SysID based on the lo0 address. Backbone router lo0 addresses must not be
   injected into area 49.0002 or 49.0001.

Without injecting the backbone (49.0003) loopbacks into 49.0001 and 49.0002,
you must use the default route provided by the attached bit.

On Sun, Dec 14, 2008 at 4:26 AM, Ahmad Alhady <ahmad.alhady at yahoo.com>wrote:

> but the book asked for a route leaking for ONLY backbone routers LOs  (R3,
> R4 and R5) !!!
>
> so iBGP will be established with ONLY R3, R4 and R5 but not with R6 and
> R7!!
>
> Thanks
>
>
>
>
> ________________________________
> From: Cheikh-Moussa Ahmad <ACheikh-Moussa at axians.de>
> To: Ahmad Alhady <ahmad.alhady at yahoo.com>; juniper-nsp at puck.nether.net
> Sent: Sunday, December 14, 2008 12:24:02 PM
> Subject: AW: [j-nsp] JNCIP book, ISIS and BGP Q!
>
> Hi!
>
> Configure route leaking on the L2/L1 boundary router.
> You have to configure a policy, where loopback addresses
> are leaked to the L1 area.
>
> Regards,
> Ahmad
>
>
> > -----Ursprüngliche Nachricht-----
> > Von: juniper-nsp-bounces at puck.nether.net [mailto:juniper-nsp-
> > bounces at puck.nether.net] Im Auftrag von Ahmad Alhady
> > Gesendet: Sonntag, 14. Dezember 2008 03:16
> > An: juniper-nsp at puck.nether.net
> > Betreff: [j-nsp] JNCIP book, ISIS and BGP Q!
> >
> > Hi all
> >
> > in JNCIP book in ISIS Chapter in Miscellaneous IS-IS Knobs section they
> > ask for the following
> >
> > Ensure that r2 cannot reach destinations outside of area 49.0003 while
> > keeping all its IS-IS
> > adjacencies up and without modifying its routing-options stanza
> >
> > so we will use "ignore-attached-bit" command
> >
> > OK..!
> >
> > then in BGP section, how we will establish iBGP between R2 and R6,R7
> > ????
> > as R2 is unable to reach both R6 and R7
> >
> > Thanks.....
> >
> > Ahmad
> >
> >
> >
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