Secondary Ip address Usage!


Secondary IP address command on the router is to actually bind another subnet to the same interface. So, lets say that you have bound to an ethernet interface of a router. is used else where in your network. You outgrow your subnet and need more addresses, so you bind to the interface. You would essentially have 2 different subnets, bound to the same interface and the router would route both subnets. However, these subnets would be on the same broadcast domain.

This isn’t a best practice. It isn’t recommended. It is possible. I have seen a few networks where this was done as a temporary measure until the sites were re-addressed with a more contigious addressing scheme

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