[j-nsp] Cisco advertise-map in juniper

[xinyu zeng]

Thanks you. I had missed that point...

On 9/16/06, Vladimir S. Blazhkun <v.blazhkun at pcs-net.net> wrote:
>
> > IOS have 'advertise-map/non-exist-map' to control which routes to be
> > advertsed if some other routes not available. Is there any way Junos
> > can do that?
>
> Sure, use aggregated/generated routes with some policies.
>
> Example (search this list for more):
>
> protocols bgp {
>      group ebgp {
>         type external;
>         neighbor 10.1.0.1 {
>             description primary;
>             export announce-conditional-generate;
>             peer-as 10;
>         }
>         neighbor 20.1.0.1 {
>             description backup;
>             export announce-conditional-aggregate;
>             peer-as 20;
>         }
>     }
> }
>
> routing-options {
>      aggregate {
>         route 192.168.0.0/16 {
>             policy check-contributing-routes;
>             discard;
>         }
>      }
>      generate {
>         route 192.168.0.0/16 {
>             policy check-contributing-routes-2;
>             discard;
>         }
>      }
>      static {
>         route 192.168.0.0/32 {
>             next-hop 10.1.0.2;
>             qualified-next-hop 20.1.0.2 {
>                 preference 6;
>             }
>             resolve;
>         }
>      }
> }
>
> policy-options {
>      policy-statement announce-conditional-generate {
>         term 1 {
>             from {
>                 protocol aggregate;
>                 route-filter 192.168.0.0/16 exact;
>             }
>             then accept;
>         }
>         term 2 {
>             then reject;
>         }
>      }
>      policy-statement announce-conditional-aggregate {
>         term 1 {
>             from {
>                 protocol aggregate;
>                 route-filter 192.168.0.0/16 exact;
>             }
>             then accept;
>         }
>         term 2 {
>             then reject;
>         }
>      }
>      policy-statement check-contributing-routes {
>         term 1 {
>             from {
>                 protocol static;
>                 route-filter 192.168.0.0/32 exact;
>                 preference 6;
>             }
>             then accept;
>         }
>         term 2 {
>             then reject;
>         }
>      }
>      policy-statement check-contributing-routes-2 {
>         term 1 {
>             from {
>                 protocol static;
>                 route-filter 192.168.0.0/32 exact;
>                 preference 5;
>             }
>             then accept;
>         }
>         term 2 {
>             then reject;
>         }
>      }
> }
>
> --
> Vladimir S. Blazhkun,
> JNSS-M JNCIA-M #773 JNCIS-M #1100 JNCIP-M #289 JNCI-M
> JNCIA-J JNCI-J
>


-- 
Best Regards,
Yours Xinyu.Zeng