[Comparsion] Topology graph in NOX GUI and OpenFlow GUI

Using GNS3 for constructing an emulation network environment, I give a simple topology as follows to try running NOX GUI and OpenFlow GUI.
P.S: for more information in GNS3, please refer to this:
http://www.gns3.net/gns3-virtualbox-edition/

In NOX GUI, the topology graph is created like this:

In OpenFlow GUI, the topology graph is created like this:

[Trema] Try Trema App: flow_dumper

1. Choose "routing_switch" as my testing app. (any other simple switch app is all available...)
> ./trema run -c ../apps/routing_switch/routing_switch.conf

2. Send packets between these 2 hosts
> ./trema send_packets -s host2 -d host1
> ./trema send_packets -s host1 -d host2

3. Try to run Trema App: "flow_dumper" as follows
> TREMA_HOME=. ../apps/flow_dumper/flow_dumper
[0x000000000000e0] priority = 65535, match = [wildcards = 0, in_port = 1, dl_src = 00:00:00:01:00:02, dl_dst = 00:00:00:01:00:01, dl_vlan = 65535, dl_vlan_pcp = 0, dl_type = 0x800, nw_tos = 0, nw_proto = 17, nw_src = 192.168.0.2/32, nw_dst = 192.168.0.1/32, tp_src = 1, tp_dst = 1], actions = [output: port=2 max_len=65535]
[0x000000000000e0] priority = 65535, match = [wildcards = 0, in_port = 2, dl_src = 00:00:00:01:00:01, dl_dst = 00:00:00:01:00:02, dl_vlan = 65535, dl_vlan_pcp = 0, dl_type = 0x800, nw_tos = 0, nw_proto = 17, nw_src = 192.168.0.1/32, nw_dst = 192.168.0.2/32, tp_src = 1, tp_dst = 1], actions = [output: port=1 max_len=65535]

4. So, we can see all the flows here.

[Tutorial] How to setup QoS on Open vSwitch

There are two ways to do that:

1. Interface Rate Limiting ( on Interface )

• For instance:

         > sudo ovs-vsctl set Interface eth1 ingress_policing_rate=10000
         > sudo ovs-vsctl set Interface eth1 ingress_policing_burst=1000

 2. Port  QoS Policy ( on Port )

• For instance:

         > sudo ovs-vsctl set port eth1 qos=@newqos \
             -- --id=@newqos create qos type=linux-htb \
             other-config:max-rate=200000000 queues=0=@q0,1=@q1 \
             -- --id=@q0 create queue \
             other-config:min-rate=100000000 \
             other-config:max-rate=100000000 \
              -- --id=@q1 create queue \
             other-config:min-rate=50000000 \
             other-config:max-rate=50000000

• Qos can have more than 1 queue

[Tutorial] Trema Tutorial

http://www.fp7-ofelia.eu/assets/Uploads/201203xx-TremaTutorial.pdf

[Open vSwitch] How to get port statistics from interface in OVS

1. Show the bridge info
> sudo ovs-vsctl show
result:
2909bfce-536e-4184-a5bb-507f0553abee
    Bridge "br0"
        Controller "tcp:10.6.186.244"
        Port "br0"
            Interface "br0"
                type: internal
        Port "eth3"
            Interface "eth3"
        Port "eth2"
            Interface "eth2"
        Port "eth1"

2. Get port statistics from interface
> sudo ovs-vsctl get Interface br0 statistics
result:

{collisions=0,

rx_bytes=0,

rx_crc_err=0,

rx_dropped=0,

rx_errors=0,

rx_frame_err=0,

rx_over_err=0,

rx_packets=0,

tx_bytes=0,

tx_dropped=0,

tx_errors=0,

tx_packets=0}

[Python] How to use Decorators for Functions and Methods

When list_ports() is executed, Class ApiCall will be created for becoming a decorator to examine the arguments as follows:

import sys class ApiCall(object): """A Decorator to add support for format and tenant overriding""" def __init__(self, function): self.function = function def __get__(self, instance, owner): def with_params(*args, **kwargs): """ Temporarily sets the format and tenant for this request """ (format, tenant) = (instance.format, instance.tenant) if 'format' in kwargs: instance.format = kwargs['format'] if 'tenant' in kwargs: instance.tenant = kwargs['tenant'] ret = self.function(instance, *args) (instance.format, instance.tenant) = (format, tenant) return ret return with_params class Client(object): def __init__(self, tenant=None, format="xml"): self.tenant = tenant self.format = format @ApiCall def list_ports(self, network): """ Fetches a list of ports on a given network """ return network def main(): client = Client(tenant="AAA",format="xml") client.list_ports('my network') sys.exit(0) if __name__ == "__main__": main()

[Tutorial][Trema] Show Topology

 Trema有一個很不錯的App, 可以利用toplogy與 topology_discovery App, 去產生topology graph…如下:

下列為Network emulation的設定檔內容

# virtual switches

vswitch("switch1") { datapath_id "0x1" }

vswitch("switch2") { datapath_id "0x2" }

vswitch("switch3") { datapath_id "0x3" }

vswitch("switch4") { datapath_id "0x4" }

vswitch("switch4") { datapath_id "0x5" }

# virtual hosts

vhost("host1")

vhost("host2")

vhost("host3")

vhost("host4")

# virtual links

link "switch1", "switch2"

link "switch1", "switch3"

link "switch2", "switch3"

link "switch2", "switch4"

link "switch2", "switch5"

link "switch3", "switch4"
link "switch3", "switch5"

link "switch4", "switch5"

link "switch4", "host1"

link "switch4", "host2"

link "switch5", "host3"

link "switch5", "host4"