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Cisco VLAN interface connection

If I understand you can create Vlan for instance Vlan10 that might span 10 ports, then create interface Vlan10.

assuming there are other Vlans on the same switch and on other Cisco switches.. how is the interface Vlan helpful since you cannot connect a cable to it in one end another end to the other interface Vlan …

any explanation about interface Vlan will be helpful

Thank you
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James H
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I believe you can create VLANs then create Trunk port to make VLANs on one switch talk to VLANs on another switch if allowed.
I am trying to understand VLAN interface…
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On a Single switch, it makes sense to me to create SVIs for each VLAN, so that when you you type the IP ROUTING command, it will make each VLAN able to talk to the other VLAN without creating a Trunk Port( Obviously all ports are on the same switch).

However, if you have multiple switches, I believe Trunk port to the Router will do the same thing.
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If more than one VLAN is configured on a switch , I believe it is helpful to configure SVIs on that Switch, for instance if we have VLAN10 and 11 on the same switch and we have PC10 plugged to VLAN10 and PC11 plugged to VLAN11, then with SVIs,  PC10 can talk to PC11 without going through  Trunk port to  the Router then back to Trunk Port then to the other VLAN on the same switch
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Thank you