Supporting Connected Routes to Subnet Zero
The other features discussed in this section—configuring IP addresses on physical interfaces, using ROAS, Layer 3 switching, and even secondary addressing—all give network engineers some options for how to connect routers to local subnets so that the router can route packets to and from those subnets. This last topic in the second major section of the chapter looks at a router feature that has been around for a long time to overcome some early problems in the history of IPv4, but today, you would not seek to use this feature as a means to an end.
IOS can restrict a router from configuring an ip address command with an address inside the zero subnet. The zero subnet (or subnet zero) is the one subnet ...
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