As part of becoming part of AWS networking, I got access to Junosphere - Junipers training environment for customers. As my last usage of Juniper gear has been a few years ago and even back then quite simple, I started to work through practice excercises (based on Pluralsight courses) using Junosphere. My setup consists of a simple set of 6 routers:

                                            +--------------------+
                                            |                    |
                                            /  Provider Spine 1  \
                                           /|                    |\
+--------------+    +-------------------+ / +--------------------+ \ +-------------------+    +--------------+
|              |    |                   |/                          \|                   |    |              |
|  Customer 1  ------  Provider Edge 1  /                            -  Provider Edge 2  ------  Customer 2  |
|              |    |                   |\                          /|                   |    |              |
+--------------+    +-------------------+ \ +--------------------+ / +-------------------+    +--------------+
                                           \|                    |/
                                            \  Provider Spine 2  /
                                            |                    |
                                            +--------------------+

Using this abstract topology, I have built basically three different setups: two using OSPF as IGP on the provider site and one using IS-IS as IGP. One of the OSPF examples and the IS-IS example use RSVP/MPLS as transport between the two provider edges, while the other OSPF examples uses LDP/MPLS. Common to all examples are eBGP between customers and provider and iBGP between provider edges.

If you are learning as well, or are just curious how these things look like in code, head over to Github: https://github.com/02strich/junosphere