[c-nsp] GLBP Groups Question

[Phil Mayers]

> 
> 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).