Hello all, i'm writing hear because i have a problem with some simulation that i'm making, the simulation is on my laptop with VM. I'm focusing on the hold timer expiration, i want to make this timer expire and see the differences. This is my topology: H1---H2----H3----H4----H5 H1 and H5 are the only one that share some route, i'll call them R1 and R2. So when the network it will be stabilized, in all RT (H1,H2,H3,H4,H5) I will have 2 voice, one to reach R1 and one to reach R2. In every host i setted an hold timer = 3 for every session, with this command: hold time 3; Now i want to "kill" the node H3 and see this result: after 3 seconds see in the RT of H2 and H4 a variation, like one cannot more reach R1 and the other one cannot reach R2. How can i do it? i need to disable something? because i tried this: 1)using the command: birdc -s socket_H3 down and shutting down the VM i see that the process that is shutted down, but the other simulation changed immediatly the RT so i tried: 2)use only the command birdc -s socket_H3 down and get active the VM i was thing that there was a checking on the interface if it is active or not. But it didn't work, the RT of others changed istantly. 3) so i was thinking that before closing itself bird send a signal to other bird connected (i didn't search in the code) so i use the command "sudo kill -9 *pid*" on the pid of the bird relative to H3, but with a big surprised i see that not only the process associated with H3 is killed but it will be closed the process of H2 H3 and H4 i'll try to explain it better: Process list: 100 Bird_H1 101 Bird_H2 102 Bird_H3 103 Bird_H4 104 Bird_H5 i use "sudo kill -9 102" process list resulting: 100 Bird_H1 104 Bird_H5 The survives is only the process that was sharing some route. do you have any suggestion to see the expiration of hold timer in act? Thanks a lot, Mattia