Hi Li Cheng,
Thank you very much for your contribution!
In fact, in my previous answer I was pointing out at your solution.
Nevertheless, thanks for the link because I will have access to the latest
version of the code.
Regarding your code, I have some doubts and I am afraid that I am not
running it properly. Could you provide some hints about how to execute it?
For instance, have you tested in a loop topology? If that case we should
add some module to compute routes, isn't it? How is the app to determine
the path if there are multiples? Or do you insert the rules manually?
Regarding the LLDP storm I was commenting previously.... I want to mention
that was a storm of packet-in requests generated by LLDP multicast
messages, so in order to avoid this problem what I have done is to make a
rule in my app to drop these packets. Similar to what you did Li Cheng for
Ipv6 packets in the ARP proxy application. My idea is to get the topology
information from the LinkAdd and LinkDelete events.What do you think?
Thanks again for your hints!
RyuJordiSDN
2015-01-22 3:15 GMT+01:00 李呈 <[email protected]>:
> Hi, long time ago, I had finished a simple application of avoiding ARP
> strom by ARP-PROXY, you can get it at:
> https://github.com/muzixing/ryu/blob/master/ryu/app/arp_proxy_13.py
>
>
> ------------------
> Li Cheng 李呈
> _____________________________________________________
> School of Information and Communication Engineering
> Beijing University of Posts and Telecommunications
> Beijing 100876, PR China
>
> 北京邮电大学·信息与通信工程学院·通信工程
> _____________________________________________________
> Mobile Phone:
> (+86) 151-1698-3550 Beijing
> E-mail:
> [email protected]
> [email protected]
> Homepage:
> http://www.muzixing.com
>
>
>
>
> ------------------ 原始邮件 ------------------
> *发件人:* "Jordi Baranda"<[email protected]>;
> *发送时间:* 2015年1月20日(星期二) 下午4:59
> *收件人:* "ryu-devel"<[email protected]>;
> *主题:* [Ryu-devel] Avoid ARP flooding storm in a multipath topology
>
> Dear all,
>
> I am new in this world of SDN and based upon some comments on the net and
> I decided to start by using the Ryu/mininet/ovs friendly environment to
> start with it. After reading the Ryubook I am trying to develop my own
> application which tries to exploit the redundancy in a multipath topology
> to perform load balancing in a round robin fashion.
> Then, I create the topology the following topology in mininet (sorry for
> the ASCII type draw)
>
> h3 --- s3 -------- s4 ------- h4
> | |
> | |
> h1----s1-----------s2 ------- h2
>
> When I run the simple_switch Ryu app, I started to see a lot of packet-in
> events. There was a storm of ARP broadcast packets which are overloading
> the controller. Reading in the Ryubook I saw that the spanning tree
> protocol handles this, but as far as I have understood this is not suitable
> to exploit multipath topologies.
>
> Does anyone have an idea on how to avoid this storm of broadcast ARP
> requests?
> My first approach was to cache the appearance of broadcast ARP classifying
> them by [datapath id (switch), src_ip, dst_ip] with the hope that they
> were only broadcast once at each switch but I think I have not been able to
> properly implement it.
> I think the other problem is that I have to provide a route, isn't it? I
> was thinking on using the NetworkX library for such purpose.
>
> Any hint will be welcome
>
> Thank you very much for your time and attention
>
> Jordi
>
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