Problem with clist

[Mihai Claudiu Capatina]

Hi,

Line 21 is : if ( (100,101) ~ bgp_community )  then { myc = add(myc, (100,101)); }

I tried defining allow_communities as a clist also but it did not work either.

In the end i changed everything to bgp_community.delete ( <pair set > ), but we have a huge list of peers and the <pair set>  to define them is huge and hard to maintain. Now i have a script in python to generate the <pair set>  from a file containing the ASN of our peers.

By the way, is there a way to call an external script from filters ? To be more explicit i would like to filter according to RIPE route objects.


Best Regards,

Mihai Claudiu Capatina

Managing Partner
Vector Communications SRL

Address : Aleea Cetatuia, Nr. 4, Bl. M22, Sc. 5,
		  Et. 2, Ap. 276, Sect. 6, Bucuresti, 060834
		  Romania
Phone:     +40-729-087003
Fax:          +40-318-146297

www.vector-communications.net



On Jun 16, 2011, at 3:11 PM, Ondrej Zajicek wrote:

> On Wed, Jun 15, 2011 at 04:09:13PM +0300, Mihai Claudiu Capatina wrote:
>> 
>> Hi,
>> 
>> We are trying to filter unwanted communities that our peering partners have forgot to remove in order not to send them to other peering parties.
>> In order to do this we add the communities we want to a clist parameter, empty bgp_community, then add the clist back to bgp_community.
>> 
> ...
>> The problem appears in the log fie :
>> 
>> Jun 15 15:59:59 jls bird: filters, line 21: Can't add/delete to non-clist
>> Jun 15 15:59:59 jls last message repeated 4 times
>> Jun 15 15:59:59 jls bird: ...
>> 
>> We are running BIRD 1.3.1 on FreeBSD 6.2.
>> 
>> Can you please point me in the right direction ?
> 
> Which line in your config file is line 21?
> I am not sure what is a default value of local variable myc,
> perhaps you could init it using 'myc = - empty -;'
> (undocumented syntax for empty clist).
> 
> One obvious problem is here:
> 
> allow_communities = check_allow_communities();
> 
> Because allow_communities has a type pair set, but
> check_allow_communities returns clist)
> 
> I thing that problem is that bgp_community.add cannot add clist,
> just a pair of pair set (but it is true that extending add operation
> to handle clist is natural).
> 
> But even if bgp_community.add worked with clist, it probably wouldn't
> do what you wanted.
> 
> The simplest way to remove unwanted communities is just:
> 
> bgp_community.remove( [set of unwanted communities] )'
> 
> -- 
> Elen sila lumenn' omentielvo
> 
> Ondrej 'SanTiago' Zajicek (email: santiago at crfreenet.org)
> OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net)
> "To err is human -- to blame it on a computer is even more so."