Really my question boils down to:
Is this configuration:
interface Vlan10
description Data Stack 1
ip address x.x.x.x 255.255.255.0
glbp 10 ip x.x.x.x
!
interface Vlan11
description Management Stack 1
ip address y.y.y.y 255.255.255.0
glbp 10 ip y.y.y.y
anymore efficent than this configuration:
interface Vlan10
description Data Stack 1
ip address x.x.x.x 255.255.255.0
glbp 10 ip x.x.x.x
!
interface Vlan11
description Management Stack 1
ip address y.y.y.y 255.255.255.0
glbp 11 ip y.y.y.y
I don't think so. The GLBP groups are local to an SVI.
HOWEVER - each GLBP group uses a different GLBP virtual MAC address, and
the sup has a limit as to the size of it's MAC receive filter - 64 on
older hardware, and 1024 on newer hardware - so using the same group is
still valuable
HSRP has a feature called "hsrp multiple group optimisation" that will
do what you want, but it doesn't work on SVIs - only subints (bah).
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