[c-nsp] hsrp/vrrp with mpls vpn's

[Michael Sprouffske]

So, I have this hsrp lab setup with a coulple PE routers and come CE routers.  Everything works and all is well.  I wanna know how the 2 PE routers that are playing in the hsrp role notify other PE routers upstream or if they do.  So for example, I have one CE1 router attached to  PE1 and PE2  and they are doing hsrp and it works well. I also have PE3 and PE4 attached to CE2.   How do PE1 and PE2 communicate the hsrp stuff to PE3 and PE4 or do they need to?  How does PE3 and PE4 know where to send packets?