bgppath.filter question - modifying AS_PATH

17 Dec 2013

      Hello,

We use BIRD as Route Server.

According your documentation we would like to know how given AS_PATH can 
be modified for example:

To delete ALL ASNs from given AS_PATH except one AS predefined in int set.

Here is my example config:

function filter_bgp_as_path()
int set remove_as;
{
remove_as = [ 50 ];
bgp_path.filter(remove_as);

return true;
}

table T65533

protocol pipe P65533 from PIPES {
   description "TEST";
   peer table T65533;
   export all;
}

protocol bgp R65533x1 from PEERS {
   source address 10.0.0.200;
   description "TEST";
   neighbor 10.79.2.2 as 65533;
   multihop;
   import none;
   export where filter_bgp_as_path();
   table T65533;
   passive off;
}

After running "birdc configure" I see in bird.log to return the 
following error:

17-12-2013 14:44:47 <ERR> filters, line 8: Can't add/delete to non-(e)clist
17-12-2013 14:44:47 <ERR> filters, line 8: Can't add/delete to non-(e)clist
17-12-2013 14:44:47 <ERR> filters, line 8: Can't add/delete to non-(e)clist

Could you please point me in the right direction ? Is it possible at all 
to modify AS_PATH attribute?

Thanks in advance!

Best~
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