Reconfiguring an Upgraded Routing Daemon

When upgrading all routing daemons in place (that is, on the same host computers, without any changes to the physical configurations of those computers), you can configure the new daemons by copying the old daemons’ store files, and after installing the new executable, restoring their respective store files.

In contrast, changing any physical detail of the hardware of any routing daemon can require changes to the store file configurations of several routing daemons. For example, if one routing daemon moves to a new host computer, you must modify its configuration and the configurations of all its neighbors. (At minimum, the local network interfaces configurations and neighbor interfaces configurations must reflect the change.) Similarly, changes to the network interfaces on one of the host computers requires changes to the configurations of several routing daemons. In such situations, you must modify the configurations.