Generated routes are very similar to aggregate routes, with one
exception: generated routes inherit a real next-hop interface, while
aggregate routes only allow discard or reject as next-hops.
For example, the following config:
routing-options {
    aggregate {
        route 192.168.16.0/21;
    }
    generate {
        route 10.0.0.0/16;
    }
}
Results in:
lab@groupstudy> show route protocol aggregate
inet.0: 57 destinations, 60 routes (57 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
10.0.0.0/16        *[Aggregate/130] 00:00:04
                    > via so-0/0/0.0  <<<<<<REAL NEXT HOP (inherited
from contributor)
192.168.16.0/21    *[Aggregate/130] 1d 08:33:02
                      Reject          <<<<<<Reject is the default (can
be configured to discard)
Note that they both show up in the routing table as protcol type
Aggregate.
HTH,
Scott
JunoGuy wrote:
> 
> Could someone please explain to me the use of a Generated route?  I understand that it is use as a "route of last resort" but say I have the following configuration:
> 
> routing-options {
>  generate {
>      defaults {
>         metric 10;
>      }
>      route 172.16.12.0/21;
>      }
>   }
> 
> Will this generated route statement mean that a default route will be installed in the routing table with a metric of 10 and will become active IF a more specific route to that destination is not found?  Am I understanding this right?
> 
> TIA,
> 
> JunoGuy
> --
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