Port-security can be enabled individually for a VSAN: https://www.cisco.com/c/en/us/td/docs/switches/datacenter/mds9000/sw/8_x/config/security/cisco _mds9000_security_config_guide_8x/configuring_port_security.html switch(config)# port-security activate vsan 1 Activates the port security database for the specified VSAN, and automatically enables auto- learning.