Authentication: works with FRR master since #23331
1024 sessions, and the registration burst a released bfdd loses The engine holds 1024 sessions. A released bfdd offloads only about 58 of them per connect; #22645 on master fixes it, and the measured numbers are from master.
Add FRR compatibility page with measured per-version results Records the 10.1.2 floor, the unixc EINVAL range and the ten merged bfdd fixes that are not in any release yet. Corrects the Installation claims, which said 8.4 onwards and named 10.5.1 as the unixc boundary.