On Sep 24, 2012, at 15:14 , Aldrin Isaac <[email protected]> wrote:

> A subnet (L2 VPN) could communicate with end-systems on other subnets
> via a default gateway IP interface that is in a VRF which is a member
> of an L3 VPN.

And, right on cue, Aldrin tells us why IRB is needed :-)

Totally agreed: necessary, whether one likes it or not.  To channel Maria, 
though, one could "simulate" this by IP routing both within and between 
subnets.  A uniform forwarding approach would make things a lot simpler.  So 
the question comes back: why consider a "subnet" a Layer 2 entity?

Kireeti.

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