Is the Cat6K running IOS or CatOS?. For CatOS, you do not need to configure a VLAN as the NAM management port because that port automatically synchronizes to the VLAN assigned to interface sc0 on the supervisor engine. Note: You cannot set the NAM management port VLAN with the set vlan mod/port command.
For IOS, To configure a VLAN for the NAM management port, you must use the analysis module mod_num management-port access-vlan vlan_id command on the switch
