Comparison Between MTR and TBR TBR (TOS Based Routing) can’t exclude selectively link from a single TOS unspecified TOS metrics defaults to the TOS 0 metric “Unreachable” metric would have to be defined inefficient if link participate in few topologies, where other topologies would have to be advertised as “Unreachable” MTR include only metrics for those topologies that are active on the link |