The configuration of the Juniper routers is given below.

And respectively on Cisco:

As can be seen, the model is such that all the routes of the router are redistributed in the IS-IS. An alternative approach would be to include all the interfaces in the IS-IS as passive interfaces.

This is not considered to have serious drawbacks, as none of these redistributed routes are advertised outside the autonomous system: the advertisement includes the aggregates only.