[j-nsp] Enable EVPN on existing mpls l3vpn network

[Olivier Benghozi]

> 19 feb 2016 at 00:02, Chuck Anderson <cra at WPI.EDU> wrote :
> 
>> recommended 13.3R8 code.  I read NSR is not supported for EVPN.  If i
>> enable family evpn signalling will NSR be supported for existing l3vpn
>> functionality?
> 
> Yes.

No.
But there's a workaround:

> Yes, the BGP session will reset.  Alternatively, you can set up a
> separate BGP session for just EVPN so that you don't affect your L3VPN
> BGP session.

The workaround to use in order to keep NSR for other address families, and it also avoids iBGP flap. Additional loopback is needed.