Access VLANs Being Disabled
For any existing VLANs, also verify that the VLAN is active. The show vlan command should list one of two VLAN state values, depending on the current state: either active or act/lshut. The second of these states means that the VLAN is shutdown. Shutting down a VLAN disables the VLAN on that switch only, so that the switch will not forward frames in that VLAN.
Switch IOS gives you two similar configuration methods with which to disable (shutdown) and enable (no shutdown) a VLAN. Example 10-7 shows how, first by using the global command [no] shutdown vlan number and then using the VLAN mode subcommand [no] shutdown. The example shows the global commands enabling and disabling VLANs 10 and 20, respectively, and using ...
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