Top Document: comp.dcom.sys.cisco Frequently Asked Questions (FAQ)
>* what is the real purpose of the network subcommand of > router commands? When do I not want to include a network > I know about? The real purpose of the 'network' sub-command of the router commands is to indicate what networks that this router is connected to are to be advertised in the indicated routing protocol or protocol domain. For example, if OSPF and EIGRP are configured, some subnets may be advertised in one and some in the other. The network command enables one to do this. An example of such a case is a secure subnet. Imagine the case where a set of subnets are permitted to communicate within a campus, but one of the buildings is intended to be inaccessible from the outside. By placing the secure subnet in its own network number and not advertising the number, the subnet is enabled to communicate with other subnets on the same router, but is unreachable from any other router, barring static routes. This can be extended by using a different routing protocol or routing protocol domain for the secure network; subnets on the various routers within the secure domain are mutually reachable, and routes from the non-secure domain may be leaked into the secure domain, but the secure domain is invisible to the outside world.
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