[ovs-discuss] switch port numbers seems to change

[Rod N. Melton]

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)? 

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 

 
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