How to exit routing and switch devices

Recently, When I Was debugging the company's routers and switches, I found a strange phenomenon, that is, the working Cisco 6509 suddenly cannot be managed through remote Telnet, the information displayed is that the connection is closed.

I had to connect to the vro using the CONSOLE line in the central data center, and found that the CONSOLE can be used to log on to Cisco 6509 normally. Then, I used the "sh user" command to find that there were too many connections in Telnet, and the number of connections was too large to establish a new Telnet connection. I will immediately use the "clear line vty connection number" command (numbers ranging from 0 to 5) to clear the Telnet connection, after executing six clear connection commands, all Telnet connections are cleared. Now, you can use the Telnet command to remotely manage the vrotelnet.

Who knows it is not a long time. In a few days, Cisco 6509 cannot use Telnet to log on, and it is still because there are too many connection threads. After repeated tests, I found that the cause of this failure was that the Administrator did not use the normal exit command "exit" when logging out of Cisco 6509 remotely ", instead, click the close button in the upper-right corner of the Management window. As a result, the current user has not actually exited from the vro. In the vro, the connection is not actually disconnected. After a long period of time, when the number of connections in Telnet exceeds the maximum number of connections configured in the vro, a logon failure occurs.

Therefore, when you exit a vro or vswitch, you must use the correct exit command "exit" instead of simply clicking "close.

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