Re: key/value structure

9 May 2015

      On 09/05/2015 01:32 πμ, Ondrej Zajicek wrote:
...
On Fri, May 08, 2015 at 11:35:33PM +0200, Pavlos Parissis wrote:
...
Hi,
For each ip_prefix I advertize I need to add a BGP community in the form
of  (ASN,<RouterID>).
I have the following mapping between IPs and RouterIDs
ip_prefix, RouterID
10.10.10.1, 1
10.10.10.2, 2
10.10.10.3, 3
10.10.10.4, 1
10.10.10.5, 2
10.10.10.6, 3
.....
So, inside a function I need to express the following
lookup_community_router_id() {
   return some_kind_of_dict_structure(net.ip)
}
and the use it in a filter/function
filter {
   bgp.community((1111, lookup_community_router_id(net)));
   accept;
}
Is this possible?
Hi
Surprisingly, it is possible - you could use big case expression which
returns appropriate value. As case uses the same implementation as sets,
it will be fairly efficient:
function lookup(ip val)
{
    case val {
  10.10.10.1: return 1;
  10.10.10.2: return 2;
  ...
    }
  return 0;
}
I am impressed,

Thanks a lot for the assistance.
Next time I should read twice Control structures:
http://bird.network.cz/?get_doc&f=bird-5.html#ss5.4.

Sorry for the noise,
Pavlos