CISCO CASE--思科网络设备无法telnet。_思科网络加油站

CISCO CASE--思科网络设备无法telnet。_思科网络加油站_百度空间

Title	The router cannot accept a Telnet session
Core Issue	Cisco IOS® Software only allows a limited number of Telnet sessions. The router could already be at its capacity for Telnet sessions or could not be configured to accept any Telnet sessions.
Resolution	To resolve this issue, perform these steps: Establish a console session. Issue the command. This verifies whether the maximum number of `VTY` lines are already in use, as shown in this example: router#show line Tty Typ Tx/Rx A Modem Roty AccO AccI Uses Noise Overruns Int * 0 CTY - - - - - 0 1 0/0 - 65 AUX 9600/9600 - - - - - 0 0 0/0 - * 66 VTY - - - - - 2 0 0/0 - * 67 VTY - - - - - 2 0 0/0 - 68 VTY - - - - - 0 0 0/0 - 69 VTY - - - - - 0 0 0/0 - 70 VTY - - - - - 0 0 0/0 - The `VTY` lines with asterisks are in use. Two `VTY` lines are in use, and three others are available. Disconnect an existing Telnet session by issuing the line-number command. If this does not help, the router may not be configured to accept Telnet sessions. Cisco routers do not accept incoming network connections to asynchronous ports (TTY lines) by default. You must specify an incoming transport protocol or specify the all command before the line accepts incoming connections. If you are using your router as a terminal server to make console-port connections to routers or other devices, you will not be able to use Telnet to connect to these devices. For more information about the transport input all command, refer to the section of .
Problem Type	Console, aux port and Telnet connectivity
When Problem Occurs

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