Allowed commands at the main menu are:
clear reset functions;
configure enter configuration mode;
copy copy from source to destination;
delete delete one file in flash: file system;
dir directory of all files in flash: file system;
disable turn off privileged commands;
do to run exec commands in configuration mode;
dot1x IEEE standard for port-based access control;
enable turn on privileged commands;
erps Ethernet Ring Protection switching;
exit exit from EXEC mode;
failsafe configure failsafe relay;
firmware firmware upgrade or swap;
help description of the interactive help system;
ipv4 IPv4 commands;
ipv6 Ipv6 commands;
link-oam link OAM configuration;
logout exit from EXEC mode;
more display file;
no negate a command or set its defaults;
ping send ICMP echo messages;
platform platform configuration;
ptp misc non persistent 1588 settings;