Sometimes you want some interface to stay up even when it normally should not. This can be helpful in a lab environment with real hardware instead of dynamips. You may try to achieve this by disabling keepalive checks on a particular link:
R4(config-if)#keepalive 0
or
R4(config-if)#no keepalive
If you do this to get extra subnets in your lab you should consider a simpler method of configuring loopback interfaces and enabling IGP process on them.
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