Hi,
I've made a topology of four OVS (version 2.17.8) switches in a diamond,
two endpoints, and I'm using a Ryu controller. Installed in br1 is a group
and a flow entry to direct packets out via buckets, toward br2 and br3. The
group is set via the Ryu API in an OpenFlow v1.5 OFPGroupMod message.The
problem is that I cannot trace packets through the buckets since there is
'no live bucket' in the group. However, if I check the group using
ovs-ofctl, it looks ok. Also, if I remove it and reinstall it via
ovs-ofctl, I can trace a packet through a bucket but I have to set the
group selection method to 'hash'. I'm looking at how to include the
selection method in the properties of an OFPGroupMod message, or how to set
the default selection method in the switches, or any other suggestions.Here
is a set of commands to show what I'm seeing in OVS (initial group
installed via Ryu's API):
ubuntu@ip-172-31-18-197:~/sdn/ovs_scripts$ ./groups.sh
br1
OFPST_GROUP_DESC reply (OF1.5) (xid=0x2):
group_id=1,type=select,bucket=bucket_id:0,weight:10,actions=output:"vp1",bucket=bucket_id:1,weight:10,actions=output:"vp2"
ubuntu@ip-172-31-18-197:~/sdn/ovs_scripts$ ./flows.sh
br1
cookie=0x1, duration=8.464s, table=0, n_packets=0, n_bytes=0,
idle_age=8,
priority=1,in_port="fd4352db8bf24_l",dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12
actions=group:1
ubuntu@ip-172-31-18-197:~/sdn/ovs_scripts$ sudo ovs-appctl
ofproto/trace br1
in_port=3,tcp,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12,nw_src=10.2.0.2,nw_dst=10.2.0.3
Flow:
tcp,in_port=3,vlan_tci=0x0000,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12,nw_src=10.2.0.2,nw_dst=10.2.0.3,nw_tos=0,nw_ecn=0,nw_ttl=0,nw_frag=no,tp_src=0,tp_dst=0,tcp_flags=0
bridge("br1")
-------------
0. in_port=3,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12,
priority 1, cookie 0x1
group:1
-> no live bucket
Final flow: unchanged
Megaflow:
recirc_id=0,eth,ip,in_port=3,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12,nw_src=0.0.0.0/2,nw_dst=0.0.0.0/2,nw_frag=no
Datapath actions: hash(l4(0)),recirc(0x1b)
ubuntu@ip-172-31-18-197:~/sdn/ovs_scripts$ ovs-ofctl del-groups br1
ubuntu@ip-172-31-18-197:~/sdn/ovs_scripts$ ovs-ofctl add-group br1
group_id=1,type=select,bucket=bucket_id:0,weight:10,actions=output:"vp1",bucket=bucket_id:1,weight:10,actions=output:"vp2"
ubuntu@ip-172-31-18-197:~/sdn/ovs_scripts$ ovs-ofctl add-flow br1
in_port=3,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12,actions=group:1
ubuntu@ip-172-31-18-197:~/sdn/ovs_scripts$ sudo ovs-appctl
ofproto/trace br1
in_port=3,tcp,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12,nw_src=10.2.0.2,nw_dst=10.2.0.3
Flow:
tcp,in_port=3,vlan_tci=0x0000,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12,nw_src=10.2.0.2,nw_dst=10.2.0.3,nw_tos=0,nw_ecn=0,nw_ttl=0,nw_frag=no,tp_src=0,tp_dst=0,tcp_flags=0
bridge("br1")
-------------
0. in_port=3,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12, priority 32768
group:1
-> no live bucket
Final flow: unchanged
Megaflow:
recirc_id=0,eth,ip,in_port=3,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12,nw_src=0.0.0.0/2,nw_dst=0.0.0.0/2,nw_frag=no
Datapath actions: hash(l4(0)),recirc(0x1c)
ubuntu@ip-172-31-18-197:~/sdn/ovs_scripts$ ovs-ofctl del-groups br1
ubuntu@ip-172-31-18-197:~/sdn/ovs_scripts$ ovs-ofctl add-group br1
group_id=1,type=select,selection_method=dp_hash,bucket=bucket_id:0,weight:10,actions=output:"vp1",bucket=bucket_id:1,weight:10,actions=output:"vp2"
ubuntu@ip-172-31-18-197:~/sdn/ovs_scripts$ ovs-ofctl add-flow br1
in_port=3,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12,actions=group:1
ubuntu@ip-172-31-18-197:~/sdn/ovs_scripts$ sudo ovs-appctl
ofproto/trace br1
in_port=3,tcp,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12,nw_src=10.2.0.2,nw_dst=10.2.0.3
Flow:
tcp,in_port=3,vlan_tci=0x0000,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12,nw_src=10.2.0.2,nw_dst=10.2.0.3,nw_tos=0,nw_ecn=0,nw_ttl=0,nw_frag=no,tp_src=0,tp_dst=0,tcp_flags=0
bridge("br1")
-------------
0. in_port=3,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12, priority 32768
group:1
-> no live bucket
Final flow: unchanged
Megaflow:
recirc_id=0,eth,ip,in_port=3,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12,nw_src=0.0.0.0/2,nw_dst=0.0.0.0/2,nw_frag=no
Datapath actions: hash(l4(0)),recirc(0x1d)
ubuntu@ip-172-31-18-197:~/sdn/ovs_scripts$ ovs-ofctl del-groups br1
ubuntu@ip-172-31-18-197:~/sdn/ovs_scripts$ ovs-ofctl add-group br1
group_id=1,type=select,selection_method=hash,bucket=bucket_id:0,weight:10,actions=output:"vp1",bucket=bucket_id:1,weight:10,actions=output:"vp2"
ubuntu@ip-172-31-18-197:~/sdn/ovs_scripts$ ovs-ofctl add-flow br1
in_port=3,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12,actions=group:1
ubuntu@ip-172-31-18-197:~/sdn/ovs_scripts$ sudo ovs-appctl
ofproto/trace br1
in_port=3,tcp,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12,nw_src=10.2.0.2,nw_dst=10.2.0.3
Flow:
tcp,in_port=3,vlan_tci=0x0000,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12,nw_src=10.2.0.2,nw_dst=10.2.0.3,nw_tos=0,nw_ecn=0,nw_ttl=0,nw_frag=no,tp_src=0,tp_dst=0,tcp_flags=0
bridge("br1")
-------------
0. in_port=3,dl_src=de:9c:43:99:7c:46,dl_dst=ce:5c:1e:cd:2b:12, priority 32768
group:1
-> bucket 0: score 377590
-> bucket 1: score 6450
-> using bucket 0
bucket 0
output:1
Thanks,
Celyn
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