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Core issue

The Cisco Catalyst 2940, 2950, 2955, 2970, 3550 and 3750 switches are not accessible from a router for IP address configuration.


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:

  1. Attempt to connect to the switch with a console cable.   
  2. Configure the VLAN interface.   
  3. 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.   
  4. To bring a shutdown VLAN interface up, issue the no shutdown command in VLAN interface configuration mode.   
  5. 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.

For additional information, refer to the Manually Assigning IP Information section of Assigning the Switch IP Address and Default Gateway.

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