John,
I'm using GLBP round-robin in a specific scenario with
"ip routing" as the tracking mechanism, and only in this
one specific segment if the network (OSPF elsewhere), with
EIGRP as the routing protocol between R1, R2, R3, and R4:
-----+---FE----+-----
> >
R1 R2
> >
T3 T3
> >
R3 R4
> >
----+----FE---+-----
GLBP works very well here for us based on EIGRP routing
metrics.
There's a very good GLBP config white paper on CCO.
No sure if this answers your question, or not....
- ferg