Re: [Ryu-devel] How to process BGP Update message in ryu application

Iwase Yusuke Tue, 28 Nov 2017 16:55:41 -0800

Hi Hadem,

> *I guess your suggestion about using the socket method may be the best 
option. *Have you ever tried
> the socket approach?.


I haven't tried it yet because with this approach, it is required to handle the 
manners of the BGP
protocol (e.g., sending the OPEN message when established, sending KEEPALIVE 
messages periodically).

Before you staring this approach, why you need to get all UPDATE message in 
your Ryu app?
Why only the best path is not enough? Ryu provides the APIs to retrieve all 
routes which Ryu
received from peers, is it not appropriate?
http://ryu.readthedocs.io/en/latest/library_bgp_speaker_ref.html#ryu.services.protocols.bgp.bgpspeaker.BGPSpeaker.rib_get

I guess most of the UPDATE message field can be retrieved from the "Path" 
instance of the
EventPrefix or the return values of "BGPSpeaker.rib_get()".
http://ryu.readthedocs.io/en/latest/library_bgp_speaker_ref.html#ryu.services.protocols.bgp.bgpspeaker.EventPrefix

And If you just need to monitor the routes which Ryu received, how about using 
the BMP protocol?
The supported features seem to be limited, Ryu sends the updates of peer states 
and of the
adj-rib-in as the BMP messages.
http://ryu.readthedocs.io/en/latest/library_bgp_speaker_ref.html#ryu.services.protocols.bgp.bgpspeaker.BGPSpeaker.bmp_server_add

FYI, Ryu BGP service receives the BGP message here, if you don't mind the 
changing Ryu source,
you might be able to add some "hooks" for your application.

(I don't think it better way though...)


Sorry, I've missed the link to the source code in my previous mail.
The link should point to the following;

https://github.com/osrg/ryu/blob/7f6d8730ab321412e410f0eb65b8fba6947cd380/ryu/services/protocols/bgp/speaker.py#L353

As you can see in the above code, we need to handle other BGP messages with the 
socket approach...


Thanks,
Iwase


On 2017年11月28日 22:49, Pynbiang Hadem wrote:

Hi Iwase,

Regarding the *EventBestPathChanged *question i asked in the previous mail, i think i may hove gotthe wrong idea.

I guess I'm a little confused about the *EventBestPathChanged.*
*
*

*I guess your suggestion about using the socket method may be the best option. *Have you ever triedthe socket approach?.

*
*
Thanks
Hadem

On Tue, Nov 28, 2017 at 2:16 PM, Pynbiang Hadem <pynbiang.ha...@gmail.com<mailto:pynbiang.ha...@gmail.com>> wrote:


    Hi Iwase,

    Thanks for the response. Changing the source code may not be the best 
option as there are
    disadvantages involved.
    What about using the *"EventBestPathChanged(best_path_change_handler)*" 
event handler?. Do you
    think we can catch the BGP Update messages using this event?.

    Regards
    Hadem

    On Tue, Nov 28, 2017 at 5:09 AM, Iwase Yusuke <iwase.yusu...@gmail.com
    <mailto:iwase.yusu...@gmail.com>> wrote:

        Hi Hadem,

        Please let me know what "process" exactly means.
        You mean receiving all BGP UPDATE messages in your application, right?

        Currently, Ryu BGP service does not provide the APIs to pass the 
received BGP Update messages to
        other applications, so you need to manually open socket, parse the 
received buffer and
        handle the
        BGP states manually.

        Example:
             import socket
             from ryu.lib.packet import bgp
             ...(snip)...

             sock = socket.socket()
             ...(snip)...  # bind, connect, accept, ...

             buf = self.socket.recv(required_len)

             msg, _, rest = bgp.BGPMessage.parser(buf)
             # Do handling


        FYI, Ryu BGP service receives the BGP message here, if you don't mind 
the changing Ryu source,
        you might be able to add some "hooks" for your application.
        (I don't think it better way though...)


        Thanks,
        Iwase


        On 2017年11月27日 18:15, Pynbiang Hadem wrote:

            Hi Iwase,

            Actually, i want to process the BGP Update messages in my 
application.
            Pls suggest how this can be done.

            Thanks
            Hadem

            On Mon, Nov 27, 2017 at 12:54 PM, Iwase Yusuke 
<iwase.yusu...@gmail.com
            <mailto:iwase.yusu...@gmail.com> <mailto:iwase.yusu...@gmail.com
            <mailto:iwase.yusu...@gmail.com>>> wrote:

                 Hi Hadem,

                 You don't need to handle (receive, extract attributes and so 
on) the BGP UPDATE
            messages directly.
                 Ryu BGP service does handle the BGP messages, then notify the 
updates of the best
            path or connect/
                 disconnect of neighbors as the "events".
                 For example, Ryu will call the given 
"best_path_change_handler" if you uses the
            APIs of BGPSpeaker,

            
http://ryu.readthedocs.io/en/latest/library_bgp_speaker_ref.html#ryu.services.protocols.bgp.bgpspeaker.BGPSpeaker
            
<http://ryu.readthedocs.io/en/latest/library_bgp_speaker_ref.html#ryu.services.protocols.bgp.bgpspeaker.BGPSpeaker>

<http://ryu.readthedocs.io/en/latest/library_bgp_speaker_ref.html#ryu.services.protocols.bgp.bgpspeaker.BGPSpeaker

            
<http://ryu.readthedocs.io/en/latest/library_bgp_speaker_ref.html#ryu.services.protocols.bgp.bgpspeaker.BGPSpeaker>>
                 and application.py will generate the event instance if your 
application observes them.

            
https://github.com/osrg/ryu/blob/ed2c6eca2227c9efb3c7e51cdd6db6bf578ec609/ryu/services/protocols/bgp/application.py#L141-L171
            
<https://github.com/osrg/ryu/blob/ed2c6eca2227c9efb3c7e51cdd6db6bf578ec609/ryu/services/protocols/bgp/application.py#L141-L171>

<https://github.com/osrg/ryu/blob/ed2c6eca2227c9efb3c7e51cdd6db6bf578ec609/ryu/services/protocols/bgp/application.py#L141-L171

            
<https://github.com/osrg/ryu/blob/ed2c6eca2227c9efb3c7e51cdd6db6bf578ec609/ryu/services/protocols/bgp/application.py#L141-L171>>

                 Thanks,
                 Iwase


                 On 2017年11月24日 21:32, Pynbiang Hadem wrote:

                     Hi,

                     I have two Autonomous Systems AS1 and AS2. I am able to 
send BGP update message
            from AS1 to
                     AS2 and vice versa. I want to process the BGP update 
messages in my RYU
            application. I'm a
                     little confused how to achieve that.

                     Pls help.

                     Thanks
                     Hadem


                     
------------------------------------------------------------------------------
                     Check out the vibrant tech community on one of the world's 
most
                     engaging tech sites, Slashdot.org! http://sdm.link/slashdot



                     _______________________________________________
                     Ryu-devel mailing list
            Ryu-devel@lists.sourceforge.net 
<mailto:Ryu-devel@lists.sourceforge.net>
            <mailto:Ryu-devel@lists.sourceforge.net 
<mailto:Ryu-devel@lists.sourceforge.net>>
            https://lists.sourceforge.net/lists/listinfo/ryu-devel
            <https://lists.sourceforge.net/lists/listinfo/ryu-devel>
                     <https://lists.sourceforge.net/lists/listinfo/ryu-devel
            <https://lists.sourceforge.net/lists/listinfo/ryu-devel>>




            
------------------------------------------------------------------------------
            Check out the vibrant tech community on one of the world's most
            engaging tech sites, Slashdot.org! http://sdm.link/slashdot



            _______________________________________________
            Ryu-devel mailing list
            Ryu-devel@lists.sourceforge.net 
<mailto:Ryu-devel@lists.sourceforge.net>
            https://lists.sourceforge.net/lists/listinfo/ryu-devel
            <https://lists.sourceforge.net/lists/listinfo/ryu-devel>





------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot



_______________________________________________
Ryu-devel mailing list
Ryu-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/ryu-devel


------------------------------------------------------------------------------
Check out the vibrant tech community on one of the world's most
engaging tech sites, Slashdot.org! http://sdm.link/slashdot
_______________________________________________
Ryu-devel mailing list
Ryu-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/ryu-devel

Re: [Ryu-devel] How to process BGP Update message in ryu application

Reply via email to