[j-nsp] Junos Equiv to Network Statement

[Dan Armstrong]

Thanks for all the replies.


I guess when you think about it, the IOS network statement really is 
just an 'odd' place to put a policy that states 'redirect these IGP 
routes into iBGP as long as the prefix length matches exactly'.




Jonathan Looney wrote:
> The JUNOS software allows you to export any active(*) routes from your
> routing table to any peer.  You choose the routes to export via a
> policy statement.
>
> The default policy is to export routes received from other BGP peers.
> (Obviously, it won't reflect routes received from one iBGP peer to
> another iBGP peer unless route reflection is enabled.)
>
> So, if you want to send a certain network to a particular peer (or
> group of peers), just write a policy statement that does this and
> apply it to the session.
>
> For example, this policy permits the route 10.0.0.0/16:
> +  policy-options {
> +      policy-statement permit-a-network {
> +          term the-network {
> +              from {
> +                  route-filter 10.0.0.0/16 exact;
> +              }
> +              then accept;
> +          }
> +      }
> +  }
>
> And, this applies it to the neighbor 172.17.1.1:
> +  protocols {
> +      bgp {
> +          group a-group {
> +              neighbor 172.17.1.1 {
> +                  export permit-a-network;
> +              }
> +          }
> +      }
> +  }
>
> This is only a very brief overview of policy and BGP. You really
> should consult some of Juniper's on-line training or one of the
> Juniper books for more detail.
>
> -Jon
>
> (*) - In recent JUNOS versions, I believe there is also a way to send
> inactive routes, but I think that is irrelevant to your question.
>
>
> On Mon, Oct 6, 2008 at 2:32 PM, Dan Armstrong <dan at beanfield.com> wrote:
>   
>> This may sound like a dumb question, but in Junos, what is the preferred
>> method for getting a network into BGP?  The equivalent of the Cisco
>> "network" statement...
>>
>> All of the examples I can find basically redistribute other routing
>> protocols into BGP... which for some reason strikes me as wrong.  Is there
>> another method?
>>
>>
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