OSPF GTSM
In Figure 1, OSPF runs between routers, and GTSM is enabled on RouterC. The valid TTL ranges of the packets sent from routers to RouterC are as follows:
For RouterA and RouterE (which are neighbors of RouterC): (255 – hops + 1) to 255.
For RouterB, RouterD, and RouterF: 254 to 255, 253 to 255, and 252 to 255, respectively.
