Re: [Ryu-devel] Setting Default Routes in custom topology.

Iwase Yusuke Thu, 23 Nov 2017 22:14:23 -0800

Hi Taha,

Sorry, I couldn't investigate further because I don't know your situation 
(e.g., topology, IP
address assignment).
Please confirm your network design, first...


Thanks,
Iwase


On 2017年11月22日 23:16, Taha Khan wrote:

Thank you very much Iwase for your suggestion.

I tried to do the same. I used "s1.cmd('ovs-vsctl set bridge s1 protocols=OpenFlow13stp-enable=true')" to enable the STP in Mininet. And started controller using "ryu-managerryupp.rest_router ".

I am still not able to ping hosts and the packets are dropped in the middle.

I checked the flows at the routers using POSTMAN, but I see flows from host1 to host 2 but not viceversa, although I have set the routes for h2 to h1 as well.


I am *setting the interfaces addresses* *Example (there are 3 interfaces at 
router s1 in my topology).*

# ======================s1===========================
url = 'http://localhost:8080/router/0000000000000001'
payload = {"address":"172.16.20.1/24 <http://172.16.20.1/24>"}
r = requests.post(url, data=json.dumps(payload))

print (r.status_code)

url = 'http://localhost:8080/router/0000000000000001'
payload = {'address':'172.16.30.1/30 <http://172.16.30.1/30>'}
r = requests.post(url, data=json.dumps(payload))

print (r.status_code)

url = 'http://localhost:8080/router/0000000000000001'
payload = {'address':'172.10.10.1/30 <http://172.10.10.1/30>'}
r = requests.post(url, data=json.dumps(payload))

print (r.status_code)



I am *setting the routes* using requests for *Example:*
------------------------------------------------s1-----------------------------------------------------------------
#*s1(router s1) *
"url = 'http://localhost:8080/router/0000000000000001'
payload = {'destination': '192.168.30.0/24 <http://192.168.30.0/24>', 
'gateway': '172.16.30.2' }
r = requests.post(url, data=json.dumps(payload))


url = 'http://localhost:8080/router/0000000000000003'
payload = {'destination': '172.16.20.0/24 <http://172.16.20.0/24>','gateway': 
'172.16.20.1' }
r = requests.post(url, data=json.dumps(payload))"



## where h1: '172.16.20.0/24 <http://172.16.20.0/24>'
               h2: '192.168.30.0/24 <http://192.168.30.0/24>'

My *requests statuscode* are *success* every time.
Could you suggest what could possibly is going wrong.

Thanks!
Taha

On Tue, Nov 21, 2017 at 9:16 PM, Iwase Yusuke <iwase.yusu...@gmail.com<mailto:iwase.yusu...@gmail.com>> wrote:


    Hi Taha,

    I haven't investigate the further though...
    If simple_switch_stp_13 can work on the Flow Table 0 and then rest_router 
can work on the Table 1,
    they can work together, but we need to implement them to do so.

    BTW, if you just need to avoid the topology loop, how about using the STP 
features of switch side?
    OVS can handle the STP with "stp_enable" option for its Bridge and Port.

    Thanks,
    Iwase


    On 2017年11月22日 01:35, Taha Khan wrote:


            Hi Iwase, Thanks for the reply.

             But Sometimes i was able to ping the interfaces two hops away from 
source but later it
        fades
             away. Also, I was not able to see the routes set but  only 
addresses using the API
             call(/8080/router/0000000000000001). I also doubt the conflict 
because stp is layer 2
        whereas
             rest_router is layer3, hence I assume they should act 
independently. Although, if
        that’s the
             case what could be the alternative?

             Thanks!


             -------- Original message --------
             From: Iwase Yusuke <iwase.yusu...@gmail.com 
<mailto:iwase.yusu...@gmail.com>
        <mailto:iwase.yusu...@gmail.com <mailto:iwase.yusu...@gmail.com>>>
             Date: 2017/11/21 01:38 (GMT-05:00)
             To: mailfort...@gmail.com <mailto:mailfort...@gmail.com> 
<mailto:mailfort...@gmail.com
        <mailto:mailfort...@gmail.com>>
             Cc: ryu-devel@lists.sourceforge.net 
<mailto:ryu-devel@lists.sourceforge.net>
        <mailto:ryu-devel@lists.sourceforge.net 
<mailto:ryu-devel@lists.sourceforge.net>>
             Subject: Re: [Ryu-devel] Setting Default Routes in custom topology.

             Hi Taha,

             I guess simple_switch_stp_13 and rest_router cannot work together 
because these apps
        are just
             sample applications for Ryu-Book 
(http://osrg.github.io/ryu-book/en/html/index.html
        <http://osrg.github.io/ryu-book/en/html/index.html>
             <http://osrg.github.io/ryu-book/en/html/index.html
        <http://osrg.github.io/ryu-book/en/html/index.html>>).
             For example, rest_router assumes packets should be process in the 
pipeline, but does
        not aware
             of the flow entries of the other applications and might conflict 
with each other.

             Thanks,
             Iwase

             On 2017年11月21日 15:29, Taha Khan wrote:
              > Hi,
              > I am trying to set default routes in routers in my custom 
topology. My topology has
        loops, so to
              > start the controller in using the command "ryu-manager 
ryu.app.simple_switch_stp_13
              > ryu.app.rest_router  ryu.app.ofctl_rest"
              >
              > I am using python requests to make REST requests, specifying 
the destination ip
        address and the
              > gateway address in each router in my topology.
              >
              > While pinging hosts ( 2 host in my custom topology)  I am not 
able to ping and the
        packets
             are lost
              > in the middle (checked using ip traceroute).
              >
              > Can you please suggest what could have possibly gone wrong.
              >
              > Thanks!
              > Taha.
              >
              >
              > 
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Re: [Ryu-devel] Setting Default Routes in custom topology.

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