[j-nsp] Route Advertisement using Communities.

[Dang Le Hai]

Just a note that:

"from community [ customers  no-att-global ]"
"from {
                community customers;
                community no-att-global;
          }"

both are match of cusomters OR no-att-global.

"from community no-att-customer"
...
"community no-att-customer members [65000:1001 65000:2003]"
is a match of route with both communities.

You can use 1st policy for matching your "customers" routes and action is 
"next-policy" point to 2nd policy, all others is reject. In 2nd policy, you 
can have further actions depends on your matching of "no-att-global".

And at your ebgp upstream peer : export [ 1st-policy 2nd-policy];

Dang

----- Original Message ----- 
From: "Dan Benson" <dbenson at swingpad.com>
To: <juniper-nsp at puck.nether.net>
Sent: Saturday, March 05, 2005 4:26 AM
Subject: [j-nsp] Route Advertisement using Communities.


>I am currently using communities to advertise customers routes to my
> upstream providers globally, but as my network grows I want to be able
> to have my customers choose what carriers their routes are set to and
> where.  In my lab, I am making policy statements that will take my
> customer routes, Tagged as say 65000:1001, and advertise them.  The
> customer routes are tagged on the edge router that the customer peers
> with to allow us to redistribute this to our peers and upstream
> networks.  This is all working perfectly, now what I am trying to do is
> allow for the customer to tag the routes they send to us as well, and
> depending on the tag they send, have my network handle the route
> differently.
>
> Example:  I have a route from a customer BGP session, say AS65555, route
> 192.168.0.0/24. My network's edge router tags the route with a community
> 65000:1001  .I want the customer to be able to tag the routes with
> additional communities to allow the customers routes to be advertised in
> certain places or not.  In this case, the customer tags their route with
> a community of 65000:2003.  On my edge routers that connect to my peers
> and my upstreams, I will see the route as 192.168.0.0/24 with the
> communities of 65000:1001 and 65000:2003.  When I try and tell my
> routers to advertise the route based on the first tag, 65000:1001, they
> do just fine.  The Second I try and drop a route because of another tag,
> it continues to advertise the route.  I am assuming this is because I
> accept on the first tag and then try and drop on the second.  I would
> have assumed that the hierarchy of my terms would follow suit, but this
> does not seem to be the case.  Example of my policy statement:
>
>
>    policy-statement peer-0 {
>        term 5 {
>            from community customers;
>            then accept;
>       }
>       term 10  {
>             from community no-att-global;
>             the reject;
>       }
>        then reject;
>
>
> community no-att-global members 65000:2003
> community customers members  65000:1001
>
> Thanks in advance for the assistance..   //db
>
>
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