Simple VNX scenario using the Ryu controller to test QoS funcions that can be set with REST, based on the per-flow QoS example in the QoS section of Ryubook 1.0 documentation. It defines two hosts, two containers acting as OpenFlow switches and a management network linking the switches and the localhost.
Ubuntu with VNX and Ryu. It can be tested using the following ova:
- To work with the Qos module, modify simple_switch_13.py to register flow entries into table id:1, as follows:
sed '/OFPFlowMod(/,/)/s/)/, table_id=1)/' /usr/lib/python3/dist-packages/ryu/app/simple_switch_13.py > qos_simple_switch_13.py- Start ryu in a terminal:
ryu-manager ryu.app.rest_qos ryu.app.rest_conf_switch ./qos_simple_switch_13.py- Start the scenario in a different terminal:
sudo vnx -f qos-ryu.xml -v -t(You can use option -P once you are finished to stop the scenario):
sudo vnx -f qos-ryu.xml -v -P- Use the REST API to set ovsdb_addr in order to access OVSDB in switch s2, using curl from the terminal:
curl -X PUT -d '"tcp:172.17.2.2:6632"' http://172.17.2.100:8080/v1.0/conf/switches/0000000000000002/ovsdb_addr- Define a htb queing discipline to limit the rate in s2 interface to s1 to a global max_rate of 1 Mbps and set the following queues:
| Queue ID | Max rate | Min rate |
|---|---|---|
| 0 | 500 Kbps | - |
| 1 | - | 800 Kbps |
Use the REST API for this queue settings:
curl -X POST -d '{"port_name": "eth2", "type": "linux-htb", "max_rate": "1000000", "queues": [{"max_rate": "500000"}, {"min_rate": "800000"}]}' http://172.17.2.100:8080/qos/queue/0000000000000002- The default queue is qid=0. Define the following flow entry in the switch to direct that flow to qid:1.
| (Priority) | Destination address | Destination port | Protocol | Queue ID | (QoS ID) |
|---|---|---|---|---|---|
| 1 | 10.0.0.1 | 5002 | UDP | 1 | 1 |
curl -X POST -d '{"match": {"nw_dst": "10.0.0.1", "nw_proto": "UDP", "udp_dst": "5002"}, "actions":{"queue": "1"}}' http://172.17.2.100:8080/qos/rules/0000000000000002- Verify the setting
curl -X GET http://172.17.2.100:8080/qos/rules/0000000000000002- Verify it works
The following test should result in bandwidth under 500 Kbps
# h1
iperf -s -u -i 1 -p 5001# h2
iperf -c 10.0.0.1 -p 5001 -u -b 1M -l 1200 The following test should result in bandwidth over 800 Kbps, but below 1 Mbps
# h1
iperf -s -u -i 1 -p 5002# h2
iperf -c 10.0.0.1 -p 5002 -u -b 1M -l 1200- Commands to check ovs qos and queues
This command in s2 shows the flow rules:
# s2
ovs-ofctl dump-flows br0This command in s2 should show two queues are being used:
# s2
ovs-ofctl -O OpenFlow13 queue-stats br0This command obtains queue ids:
# s2
ovs-vsctl list qosThis command shows the configuration of a queue:
# s2
ovs-vsctl list queue <queue_id>