INE's CCIE SPv4 Workbook Topology consists of 20 x IOS XE CSR1000v instances and 4 x IOS XRv instances. Note that not all devices are used in each lab. When using INE's CCIE SPv4 Rack Rentals, the topology looks as follows:

The topology can also be run nearly identically in VIRL, with the only exception being that the interface numbering is offset by one (i.e. Gig1 becomes Gig2). Initial configs for VIRL are available through the INE-VIRL Git Repository.