From: Jonathan V Hays (jhays@xxxxxxxx)
Date: Fri Jul 12 2002 - 15:16:38 GMT-3
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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