RE: IS-IS route Leaking Behavior

Dear All

Thanks to everyone for their input

Faizan Khurshif

> Date: Sun, 29 Apr 2012 20:21:42 +0300
> Subject: Re: IS-IS route Leaking Behavior
> From: karim.jamali_at_gmail.com
> To: faizankhurshid921_at_hotmail.com; ccielab_at_groupstudy.com
>
> Dear Faizan,
>
> Let me try to summarize it with the following points:
> 1.By default, only L1 internal routes are leaked to L2.
> 2. There are two solutions to this, one is to manually force the routes to
> be leaked into L2 by writing a policy that redistributes routes from L1 to
> L2 and what routes need to go there. Note that you also need to acquaint
> for the internal routes. The second solution is to use wide metrics which
> will use TLVs 135 (if I am not mistaken) instead of using TLV 128. TLV135
> doesn't have any indication of internal/external and thus the route will be
> leaked to L2 automatically.
> 3.For leaking routes from L2 to L1, you always need a policy because the
> default is to only offer a default route based on the presence of the
> attached bit.
>
> HTH,
>
> Thank You
>
>
>
> On Sun, Apr 29, 2012 at 7:53 PM, faizan khurshid <
> faizankhurshid921_at_hotmail.com> wrote:
>
> > Dear Folk
> >
> > I need to know to route leaking behavior of IS-IS in Cisco
> >
> > By default level-1 not to advertise level-2
> >
> > Q1. Advertise level1 internal route to level2
> >
> > .Which metric will it be use for it, is it IP INTERNAL/IP EXTERNAL
> >
> > Q2.Advertising level1 external route into Level2 can use use
Wide-metric?
> >
> > Q3.Advertising Level2 external route into level1
> >
> > Q4.Advertising Level1 summary route External/Internal both into LEvel2
and
> > vice-versa
> >
> >
> >
> > Thanks
> >
> > Faizan Khurshid
> >
> >
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>
> --
> KJ
>
>
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Received on Sun Apr 29 2012 - 22:42:39 ART