Configuration Mode Commands : System Administration Commands : AAA, Role-Based Management, Radius, and TACACS+ Commands : username disable
  
username disable
Disables the account so that no one can log in.
Syntax
[no] username <user-id> disable
Parameters
<user-id>
User login: admin or monitor.
Usage
The no command option reenables the specified user account.
Example
amnesiac (config) # username monitor disable
Product
SCC, Interceptor, Mobile Controller, SteelHead CX, SteelHead EX, SteelHead-v, SteelHead-c
Related Commands
show usernames