Hi,
it's a TE deployment model.
Tactical TE: The objective of tactical TE is to address specific performance problems (such as hot spots) that occur in the network in an improvised and reactive manner. They are selectively deployed in the network areas.
https://ebookreading.net/view/book/EB1587050315_66.html
Strategic TE: Strategic TE tackles the congestion problem from a more systematic and proactive standpoint, taking into consideration the immediate and longer-term outcomes of specific policies and actions. Strategic TEs are deployed throughout out the network.
https://ebookreading.net/view/book/EB1587050315_67.html
Tactical Strategic
| Reserves bandwidth as necessary to affect unequal-cost load balancing | Reserves bandwidth that matches the actual traffic sent |
| Small number of tunnels | Larger number of tunnels |
| Difficult to track what tunnels are where and why they're there | Easier to track, because you know how many tunnels you have and where they go |
Here is a reference on the subject (page 98):
cisco.com/c/dam/global/fr_ca/assets/presentations/MPLS/deploying_mpls_for_traffic_engineering.pdf
tactical TE deployment (page 60)
https://www.cisco.com/c/dam/global/fr_ca/training-events/pdfs/Intro_to_mpls.pdf
