From: Herve Bruyere (hbruyere@cisco.com)
Date: Tue Mar 04 2003 - 06:19:21 GMT-3
Some good hints here:
http://www.cisco.com/warp/customer/97/isis-frint.html
And I can add something I tested in a prep setup: if R2 is a point-to-point subif and
R1 a natural interface (so network type multipoint), you can create the adjacencies by
using a tunnel between the two routers.
rv
Dimitris Vassilopoulos 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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