Hi Rahul,
I have configured the following and applied to the Core MX240 which is directly connected to the upstream Cisco where I have configured several loopback interfaces to simulate internet addressing:
set protocols isis export isis-default
set routing-options static route 50.50.50.1/32 next-hop 50.50.50.2
set routing-options static route 0.0.0.0/0 discard
set routing-options static route 0.0.0.0/0 no-install
set policy-options policy-statement isis-default from protocol static
set policy-options policy-statement isis-default from route-filter 0.0.0.0/0 exact
set policy-options policy-statement isis-default then accept
Here is the test route:
LNS (MX240) --> Core (MX240) --> Cisco (Transit) --> Loopback
So, if I ping from the LNS to the loopback without the configuration I get a "no route to host" error. If I commit the configuration and test ping to the loopback it works, and without the routing being in the table, which is great.
So, it worked. Thank you.
As a quick add on question before I close this as resolved, could you let me know if this will work in an ISP environment via the LNS?
Thanks