Split recovery mode

Split recovery mode prevents traffic loss when the ISL goes out-of-sync and keepalive subsequently fails. When the ISL goes out-of-sync and keepalive is established, the secondary VSX LAGs are brought down. If keepalive then also fails, this situation causes a split condition. In this case, if split recovery mode is enabled, the secondary switch restores its VSX LAGs so they are up.

The no split recovery command disables split recovery mode. When split recovery mode is disabled during a split condition, the secondary switch keeps it VSX LAGs down.