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Thread: Unable to telnet Cisco 3560 Switches

  1. #1
    Join Date
    Jan 2009
    Posts
    9

    Unable to telnet Cisco 3560 Switches

    Hi can anyone help me with this, i've config the same as my other switches but im unable to telnet in a LAN enviorment. I've done a:

    > conft
    > line vty 0 4
    >password abc

    But still it doesnt change

    --------------------------------------------------------------------------
    S6(config-line)#do sh running-config
    Building configuration...

    Current configuration : 9288 bytes
    !
    version 12.2
    no service pad
    service timestamps debug datetime msec loc
    service timestamps log datetime msec localtime show-timezone
    service password-encryption
    !
    hostname S6
    !
    enable password 7 070C285F4D06
    !
    no aaa new-model
    clock timezone SIN 8
    system mtu routing 1500
    vtp mode transparent
    ip subnet-zero
    !

    line con 0
    password 7 070C285F4D06
    login
    line vty 0 4
    password 7 0822455D0A16
    login
    line vty 5 15
    no login
    !
    end

  2. #2
    Join Date
    May 2008
    Posts
    1,304

    Re: Unable to telnet Cisco 3560 Switches

    You will be unable to access the device by telnet until you configure an IP address. You will need a console cable connected to the switch and the serial port on your computer. Set hyperterminal to 9600,8,n,1. Boot up the Cisco switch and then you should be able to configure the device. For more help see this: http://www.cisco.com/en/US/products/...ides_list.html

    If the switch had an IP address, then set your pc to have a static IP in the same range. connect a network cable direct to the switch and log as you would over the network.

    start
    run
    telnet 123.123.123.123

  3. #3
    Join Date
    Jan 2006
    Posts
    4,221

    Re: Unable to telnet Cisco 3560 Switches

    You might have a problem with your default gateway command - the 'default gateway' command only sets the DGW for the console. It's the 'ip route' command that determines routes for the interfaces.

    If you can ping the router, the 'ip route' is correct. If you can't telnet, you need to fix your 'default gateway'.

  4. #4
    Join Date
    Jan 2006
    Posts
    3,792

    Re: Unable to telnet Cisco 3560 Switches

    If the switch cannot be accessed, the management VLAN interface (VLAN 1 is the default management VLAN interface) may be shutdown or does not have an IP address assigned to it.

    If the VLAN interface is shutdown, perform this procedure:
    Attempt to connect to the switch with a console cable.
    Configure the VLAN interface.
    Verify that the management VLAN interface is properly IP addressed and not in a shutdown state.

    If the interface is not properly IP addressed or in a shutdown state, proceed to the next step.
    To bring a shutdown VLAN interface up, issue the no shutdown command in VLAN interface configuration mode.
    To configure an IP address to the interface, issue the ip address command.

    Note: This command can ping the switch from the router.

    If the switch is accessed from a Web browser and the Cluster Management Suite (CMS) does not launch automatically, the installation of an unsupported Java Plug-In is a possibility. If the plug-in is not enabled, this can also interrupt the CMS launch.

    For additional information or to download a supported Java Plug-in, refer to the Guidelines for Installing and Enabling the Java Plug-In section of Release Notes for the Catalyst 3550 Multilayer Switch.

    Note: Make sure to use a supported Web browser.

    To enable the Java Plug-in or verify that it is enabled, click Start > Settings > Control Panel > Java Plug-in. Then, click the Basic tab, select Enable Java Plug-in and click Apply.

    If it is not possible to ping or Telnet access the switch from other hosts in the LAN, but it is possible to ping or Telnet from the primary router, issue the ip default-gateway ip-address command to configure the default gateway. Enter the IP address of the next-hop router interface that is directly connected to the switch where a default gateway is being configured. The default gateway receives IP packets with unresolved destination IP addresses from the switch.

    Note: When the switch is configured to route with IP, it does not need to have a default gateway set.

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