[j-nsp] Interface mirroring?

[variable at ednet.co.uk]

Hi all,

Quick question.  We're setting up an M-40 with 2 gig-e interfaces so that 
failure of either interface (or the switch its plugged into) doesn't mean 
the M-40 is unavailable.  We could setup VRRP between the interfaces, but 
there is about 20 (and growing) sub-interfaces that need to be failed over 
if one of the gig-e interfaces fail.

Is there an easier way to keep the two interfaces in sync other than 
editing both interfaces by hand everytime a change has to be made?

Thanks,

Rich