[ovs-discuss] switch port numbers seems to change

Thu Aug 14 02:23:47 UTC 2014

I posted this question on mininet-discuss mail list and they insist that
it is an open vswitch question. 

why do the port numbers assigned to an interface (say s1-eth2) change
when linux system is rebooted? 

Is there an ovs-ofctl or ovs-vsctl command I can use to force/change the
switch port numbers to not change for a given interface (say s1-eth2)
when i reboot linux/ovs? 

thx, 

Rod 

On 2014-08-11 10:04, Gurucharan Shetty wrote: 

> 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 [1]

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