So I've been tasked with replacing an old 2811 router with a 3560 at a WAN site. This is connected from the existing 2811 back through a Gigaman telco circuit with a few different handoffs back to my core with a 3550. In the past, we used a GRE tunnel to ensure that multicast was working correctly.
I want to implement VRFs as well (but that might be a different animal), so I'm not sure how to go about doing this. As I just found out, our 3560 is at over software revision 3.3 where GRE functionality was removed.
Is there a good substitute way to make this work? Or am I going about this the wrong way? I'm fairly new and not sure where to go from here.