|Point to points are like so|
x.x.y.x[lan]<router>[wan]a.a.b.a <ptp> a.a.b.b[wan]<router>[lan]x.x.z.x
What is on either side of the ptp [point to point] doesn't matter as long as its in a subnet not in common with the end points.
In this case x.x.y.x is the supernetted range /23
It is not required to make x.x.z.x /23 since we are not supernetting those sides.
It is only whant the x.x.y.x side of the cisco router lan interface is changed to /23 do we lose the router. At /24 it works fine.
Again everything works in the hub at /23. All remote sites on /24 have no issues getting to and from the servers at /23
Supernetted range of x.x.98.0 to x.x.99.255 work just fine.
Question is that even with Ripv2 which supports supernetting if we change the lan side subnet mask from /24 to /23 it drops the router.
It doesn't make sense to us why it would do this.
Seems reasonable that using the supernetted subnet mask on the lan side of the routers should work at the hub.