From: Carlos G Mendioroz (tron@xxxxxxxxxxx)
Date: Fri Jul 12 2002 - 17:03:03 GMT-3
Jonathan,
IS-IS has two modes of linking (as OSPF): point to point or multipoint.
AFAIK, not like OSPF, you can not force the network type to be used
in an interface.
A frame relay main interface is for sure considered a multipoint,
whereas a point to point subinterface is not. No mix and match...
Sounds about right ?
Jonathan V Hays wrote:
>
> Group,
>
> I just had an interesting experience configuring ISIS on two routers.
> One router (R1) had two serial subinterfaces, one of which was
> point-to-point to another router running ISIS (R2). Now R2 was not
> configured with subinterfaces, just "interface serial 0" since it was
> only connected to R1 (via frame relay). I could not get ISIS routes to
> appear in the routing tables of either router.
>
> After I changed R2 to a point-to-point subinterface the ISIS routes
> popped into both routing tables.
>
> The question is, why is the point-to-point subinterface necessary on
> both ends for ISIS to propagate routes?
>
> Jonathan
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