bgp_path multiple AS match on single rule

[Javor Kliachev]

Dear Ondrej,

Thanks for the detailed response.

We will be very happy if this feature be implemented soon.

Best~

On 07/09/2013 12:02 PM, Ondrej Zajicek wrote:
> On Mon, Jul 08, 2013 at 09:35:02AM +0300, Javor Kliachev wrote:
>> Hello,
>>
>> I'm wondering, is there any way to configure following example to single
>> rule only.
>>
>> if bgp_path ~ [= * 100 * =] then return false;
>> if bgp_path ~ [= * 200 * =] then return false;
>> if bgp_path ~ [= * 300 * =] then return false;
>> if bgp_path ~ [= * 400 * =] then return false;
>>
>> On this way, If we want to filter many ASs, it seems that we should
>> generate too much rows.
> Well, you could replace that with this:
>
>      if 10 ~ bgp_path then return false;
>
> which is probably slightly faster, but you still need all the rows.
> If you would test just for last (or first) ASN, you could use:
>
>      if bgp_path.last ~ [10, 20, 30, 40, ... ] then return false;
>
> Perhaps we should implement this:
>
>      if bgp_path ~ [10, 20, 30, 40, ... ] then return false;
>
> (i.e. check every ASN from bgp_path against set of numbers) That would
> be simple to implement, consistent with our filtering features for
> community lists and works fast for a large sets of ASN.
>
> We don't support full regular expressions for bgp_path matching, just the
> shell-like wildcard patterns.
>


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