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Network Engineering

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  • The idea is that subinterfaces are used on a physical interface, but you are putting one subionterface per physical interface, and that does not make sense. You normally would put all your subinterfaces on a single physical interface, then turn on trunking on the switch interface that connects to the router interface. It looks like you only have three router interfaces: GigabitEthernet0/0/0 to GigabitEthernet0/0/2. The other four interfaces are switch interfaces, and you cannot use them as router interfaces. Commented Jul 2, 2020 at 11:06
  • 5
    The GigabitEthernet0/1/0 and GigabitEthernet0/1/1 in your router are switch interfaces in the switch module. They are not router interfaces, and you cannot use them as router interfaces. In any case, your topology does not need subinterfaces. Commented Jul 2, 2020 at 11:09
  • Did any answer help you? If so, you should accept the answer so that the question doesn't keep popping up forever, looking for an answer. Alternatively, you can post and accept your own answer. Commented Nov 19, 2022 at 23:40