I'm planning on installing new 6509's with Sup 720's. I don't have any 720's installed as of yet so I can't play around to see if this is supported. My 4506's running IOS ver. 12.2(25) doesn't support GLBP. Do any of the other sup's or IOS versions for the 4500 series have GLBP support?
I have this problem too.