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RYU Part6:

In this exercise, We are going to include the flow priority in the simple_switch_13.py(Layer 2 Switch).

In this exercise, we will add the TCP DROP flow( Match ALL Traffic) with higher priority. Remaining traffic will go via the L2 Switch flows.

Flow Priority

priority: matching precedence of the flow entry

size: 2 bytes

The packet is matched against flow entries in the flow table and only the highest priority flow entry that matches the packet must be selected

High level Steps:

  1. Add the ICMP Drop flow with priority 10000 in Openflow Feature Request event

Code changes:

Copy the simple_switch_13.py to ex5_flow_priority.py file

cp simple_switch_13.py ex5_flow_priority.py

Modify the ex5_flow_priority.py file as below,

include the libs

from ryu.lib.packet import in_proto
from ryu.lib.packet import ipv4

In the switch_features_handler function, Add the TCP drop flow

Note: Default Action is DROP.

        match = parser.OFPMatch(eth_type=ether_types.ETH_TYPE_IP, ip_proto=in_proto.IPPROTO_TCP)
        mod = parser.OFPFlowMod(datapath=datapath, table_id=0, priority=10000, match=match)
        datapath.send_msg(mod)

Test

Ryu Application

ryu-manager ex5_flow_priority.py

Mininet Topology

sudo mn --controller=remote,ip=127.0.0.1 --mac -i 10.1.1.0/24 --switch=ovsk,protocols=OpenFlow13 --topo=single,4   -x

Check the flows

sudo ovs-ofctl -O OpenFlow13 dump-flows s1

Lets Ping and watch the flows

Perform IPERF Test

h4 node

iperf -s

h1 node

iperf -c 10.1.1.4 -P 10

OVS flows

sudo ovs-ofctl -O OpenFlow13 dump-flows s1

Reference:

  1. https://www.opennetworking.org/software-defined-standards/specifications/

page 155 contains timeout details.

  1. API details http://ryu.readthedocs.io/en/latest/ofproto_v1_3_ref.html?highlight=OFPFlowMod