From: Songbin Wei (sbwei_2000@yahoo.com)
Date: Tue Mar 04 2003 - 14:38:53 GMT-3
It's not just the proper solution, but the only
solution!
--- Dimitris Vassilopoulos
<Dimitris.Vassilopoulos@eurodyn.com> wrote:
> All,
>
> Suppose that we are told to setup ISIS between two
> routers. One of them
> is the F/R hub
> and the other one is a spoke:
>
> R1
> /
> R2 --- R3
> \
> R4
>
> R2, R3, R4 run OSPF, so my question is only for
> R2-R1 which run ISIS.
>
> No subinterfaces allowed on the R1, while R2 should
> have a subinterface
> for R1.
>
> I know that ISIS runs on point-to-point F/R
> subinterfaces, but how is
> R1 going to learn
> about other routes if it cannot use point-to-point
> subinterface for the
> connection to R2?
>
> What I did is:
> I chose to have point-to-multipoint subinterface on
> R2 for the
> connection to R1 and physical
> interface on R1 (multipoint), so adjacencies and
> routing is possible.
>
> Is this the proper solution?
>
> Any input would be welcomed....
>
> D.
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