This variable indicates what is the learning limitation on the locked interface.
Possible values:
disabled - learning is stopped. The dynamic addresses associated with the
port are not aged out or relearned on other port as long as the port is
locked.
dynamic - dynamic addresses can be learned up to the maximum dynamic addresses
allowed on the port. Relearning and aging of the dynamic addresses are
enabled. The learned addresses aren't kept after reset.
secure-permanent - secure addresses can be learned up to the maximum addresses
allowed on the port. Relearning and aging of addresses are disabled.
The learned addresses are kept after reset.
secure-delete-on-reset - secure addresses can be learned up to the maximum addresses
allowed on the port. Relearning and aging of addresses are disabled.
The learned addresses are not kept after reset.