[ovs-discuss] switch port numbers seems to change

[Gurucharan Shetty]

On Sun, Aug 10, 2014 at 9:53 AM, Rod N. Melton <rnm at pobox.com> wrote:
>
>
> mininet version 2.1.0+
> ovs-vsctl (Open vSwitch) 2.1.0
> OpenDaylight with OF13
>
> Ubuntu 14.04 in VirtualBox
>
>
>
> I have a mininet topology which I created with a python script. I created
>
> a script which uses ovs-ofctl to add flows to the switches.
>
> The problem which I am having is that it seems that when i exit mininet and
>
> OpenDaylight and restart both programs I can see that the mapping between
>
> interface names (example s3-eth1) and port numbers is changing. This means
> that the script I
>
> created for adding flows no longer works. I can see the changes by using
>
> sudo ovs-ofctl show s1
>
> Can someone tell me how to prevent this change when restarting mininet (or
> OpenDaylight or Ubuntu)?

I am not familiar with mininet. Open vSwitch itself should not change
the port numbers after a restart (Otherwise, its a bug).

If they are getting changed, it probably means that a third-party
integration script deletes and re-adds the ports.

You may have better luck with this question in a mininet mailing list.


>
> Really frustrating.
>
>
>
> sudo ovs-ofctl show s3
>
> OFPT_FEATURES_REPLY (xid=0x2): dpid:0000000000000003
> n_tables:254, n_buffers:256
> capabilities: FLOW_STATS TABLE_STATS PORT_STATS QUEUE_STATS ARP_MATCH_IP
> actions: OUTPUT SET_VLAN_VID SET_VLAN_PCP STRIP_VLAN SET_DL_SRC SET_DL_DST
> SET_NW_SRC SET_NW_DST SET_NW_TOS SET_TP_SRC SET_TP_DST ENQUEUE
>  1(s3-eth2): addr:9e:fc:2c:66:e4:63
>      config:     0
>      state:      0
>      current:    10GB-FD COPPER
>      speed: 10000 Mbps now, 0 Mbps max
>  2(s3-eth1): addr:5e:42:96:e9:47:92                    << s3-eth1  was port
> 3 last time I ran mininet. why did it change??
>      config:     0
>      state:      0
>      current:    10GB-FD COPPER
>      speed: 10000 Mbps now, 0 Mbps max
>  3(s3-eth3): addr:1e:b0:98:07:23:c9                   << s3-eth3  was port 2
> last time I ran mininet. why did it change??
>      config:     0
>      state:      0
>      current:    10GB-FD COPPER
>      speed: 10000 Mbps now, 0 Mbps max
>  4(s3-eth4): addr:72:86:0e:af:dd:9a
>      config:     0
>      state:      0
>      current:    10GB-FD COPPER
>      speed: 10000 Mbps now, 0 Mbps max
>  LOCAL(s3): addr:2a:74:82:09:4a:44
>      config:     0
>      state:      0
>      speed: 0 Mbps now, 0 Mbps max
> OFPT_GET_CONFIG_REPLY (xid=0x4): frags=normal miss_send_len=0
>
> Thanks for any help.
>
> Rod
>
>
>
>
>
>
>
> _______________________________________________
> discuss mailing list
> discuss at openvswitch.org
> http://openvswitch.org/mailman/listinfo/discuss
>