[j-nsp] Encrypt a GRE tunnels between CSCO and JNPR M7i

[Massimiliano Galizia]

Hello all,
I'm been requested to bring up a test plant with two CSCOs and two M7i 
in this fashion:

______                                              _____
PCs     |-----|CSCO|--|---|JNPR|-----|PCs
                                   |
______                       |                       _____
PCs     |-----|CSCO|--|---|JNPR|-----|PCs

My customer want to encrypt with IPSEC the GRE tunnels between the 
boxes. I don't find anything related in KB or doc sites.
Any suggestion?
Many thanks in advance

Regards

Max