Wow they really shrunk it down to three commands plus the route-map, now
that's something. 

> or is there some other mechanism that triggers tunnel endpoint discovery?
I believe since it's called mGRE it has to be NHRP taking care of everything
in the background. 
Does the loopback IP has to be allocated from a common range that has to be
shared among the PEs?

I thought it's done via standard mGRE tunnels: 

interface Tunnel0
ip address 192.168.1.1 255.255.255.0
ip mtu 1440
ip nhrp authentication cisco123
ip nhrp map multicast dynamic
ip nhrp network-id 1
tunnel source FastEthernet0/0
tunnel mode gre multipoint
tunnel key 0
ip router isis 1

-maybe "mpls ip" cmd. wouldn't work with mGRE Tunnel Int. 


adam

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