Questions tagged [openflow]

A protocol for communication between controllers and network elements in a software-defined network.

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Hybrid OpenFlow Ports on Allied Telesis Switches

I have an Allied Telesis AT-IE340-20GP switch. I want to make port (12 for example) a hybrid port. With hybrid I mean it should be able to forward packets when communicating with a non-OpenFlow port (...
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Does an SDN Controller need to be connected to every Openflow enabled Switch directly? [closed]

Is it possible that the network would still function if the SDN Controller was only connected to one Openflow Switch and every other Openflow switch would be connected to that switch someway? And if ...
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How does a new switch know how to reach the controller in an SDN?

Let's say we have an existing SDN network composed of several switches and a controller. Now say we connected a new switch to the network. Now how would the new switch know how to reach the controller?...
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In an SDN (OpenFlow), are all switches directly connected to controller?

I found this question how openflow messages get routed from switch to controller? (SDN) And in the answer it says: In SDN networks all OpenFlow switches are directly connected to controllers. But if ...
Noob_Guy's user avatar
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Are Openconfig and Openflow trying to address same problem .?

I'm new to the networking world and come across these two words, Openconfig / Openflow are they trying to address same issue In traditional networking? or could anyone explain the basic difference ...
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Packet Processing Limitation of OpenFlow Pipeline in Hardware Switches

I have a 10Gbps network containing 2 servers (DellPowerEdge 4700r) and a hardware switch ( ARUBA 2930F) in between. The two servers are connected via 10G SFP+ ports to the switch. I send TCP traffic ...
Ramzah Rehman's user avatar
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Is there a method to modify bits in IP packets with OpenFlow? [closed]

We've already known that ovs-ofctl provides many actions to modify packets like set_field, load, move... but I can't find a suitable action or action combination to modify a bit in the IP packet ...
stoner's user avatar
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What is the difference between meters and queues in Openflow?

I'm new to OpenFlow and have just started studying Software Defined Networking. I have found a multiple websites mentioning that queues and meters are complementary to each other, and that they should ...
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How to manipulate Openflow data packet to change IP adresses?

I want to change the IP addresses of source and destination using Pox controller. Is there any algorithm to fulfill my requirement and where to place it in Pox ?
Shahram Khalid's user avatar
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A flow hit the OpenFlow flow table improperly

I did a small experiment by using mininet,ONOS, Iperf. I want to see flow routing according to srcIP, dstIP, UDP, dstPort. Therefore, I generated a UDP flow (srcIP=10.0.0.3, dstIP=10.0.0.2, dstPORT=...
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SDN switch: packet forwarding use of transport-layer headers

In the book "Computer Networking A Top-Down Approach - Kurose" there is an explanation as such: Packet forwarding by SDN-controlled switches can be based on any number of header field values in ...
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Detecting access point tree on POX Spanning Tree

I have created a topology at Mininet-Wifi with 4 access point and 2 station. #!/usr/bin/python import sys from mininet.net import Mininet from mininet.node import Controller,OVSKernelSwitch, ...
neurocranium's user avatar
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Scaling VXLAN tunnels in openvswitch

As we're creating a cluster of tens of KVM host nodes we've chosen openvswitch as our virtual network infrastructure. So we need to make isolated virtual networks between VMs on demand. I've seen ...
Amir K's user avatar
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dpctl: OpenFlow packet receive failed: unexpected end of file

I'm doing some experiment with SDN and pox controller, I have written flows manually shown below: dpctl add-flow tcp:127.0.0.1:6653 in_port=10,actions=output:14 dpctl add-flow tcp:127.0.0.1:6653 ...
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How to use sFlow-RT with RYU (SDN Controller) for detecting flows in a Mininet Topology?

I am new to Software Defined Networking and can't really get a full grasp of it. I want to detect the flows in a Mininet Topology created in linux environment using sFlow-RT and RYU Controller. I am ...
Kavya Barnadhya Hazarika's user avatar
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The communication among multiple controllers

I want to have a simple multi-domain topology in mininet in which each domain is controlled by a single controller and the communication among domains will take place through controllers. So I will ...
helen's user avatar
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Direct packet forwarding by controller

In a SDN network when a switch receives a packet for which it can not find a match in its flow table, it will forward this packet to the controller. The controller will decide about this packet and ...
helen's user avatar
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How does SDN Controller know the IP address from a packet?

We've always said that SDN Controllers are "Protocol-less", they don't need to know the packet's encoding to switch it or, controllers can be routed packets by the IP Address and the IP Address used ...
Abderrahmane BOUHAFARA's user avatar
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1 answer
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how openflow messages get routed from switch to controller? (SDN)

we all know that in SDN when a packet arrives at a switch if there isn't already a flow, matching this packet, the switch will generate a packet_in message and ask the controller for instructions. my ...
ashkan's user avatar
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What does this flow mean? (SDN)

mininet> dpctl dump-flows -O OpenFlow13 *** s1 ---------------------------------------------------------------- OFPST_FLOW reply (OF1.3) (xid=0x2): cookie=0x0, duration=106.605s, table=0, n_packets=...
Jim ross's user avatar
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OpenFlow: Baseline Flows for Windows environments [closed]

I'm currently looking into OpenFlow Networks in a Windows environment. To just get a network to run properly one needs to define quite a few Flows already. Per example, Active Directory communication, ...
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3 answers
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Forwarding to multiple output ports using SDN

Using switches that support OpenFlow, is it possible to forward packets for specific flows to multiple outgoing ports, so that each port receives a copy of the packet (similar to multicasting scenario,...
mnmp's user avatar
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FloodLight OpenFlow controller - ACLs, Firewall, static rules - what is the difference between them?

I'm trying to figure out what is the difference between ACLs, Firewall and static rules in FloodLight OpenFlow controller. Having look at https://floodlight.atlassian.net/wiki/display/...
yak's user avatar
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Software defined system

Over (Software defined network) what will happen when unknown Ethernet hits the first switch, using 4 OF switch and 8 host.
zooha's user avatar
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What is the difference in OpenVSwitch and openswitch?

Can anybody explain about the main difference in OpenvSwitch(http://www.openvswitch.org/) and Openswitch(http://openswitch.net/). Both of them are open source.
ds459's user avatar
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Openflow-based Switch Action set

Based on SDN, data plane's main function is to store and forward packets based on controller's instructions (in the form of flow rules). While I was reading OpenFlow Specification v5.1, I came across ...
Michael's user avatar
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OpenFlow takes some seconds to apply rule

Is there a delay for openflow rules added with ovs-vsctl tool? I am successfully limiting the traffic of a specific interface with: ovs-vsctl set interface s0-eth1 ingress_policing_rate=128 ...
Frederico Schardong's user avatar
2 votes
1 answer
526 views

Delete flow by cookie match in Pox?

Is it possible to delete flow matching a certain cookie number using Pox controller for OpenFlow? I tried something like: def delete_flow(dpid,cookie): msg = of.ofp_flow_mod() msg.match=of....
Nicolò's user avatar
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Why OpenFlow allows L4 features to be included in match structure

So in simple scenario, a router needs to maintain a routing table that has at least minimum routing features such as Destination IP, Next Hub, and NIC interface. However, in OpenFlow specification the ...
Michael's user avatar
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4 answers
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How firewalls differ between traditional networks and SDN

Is there a major difference between stateful firewalls that exist in the traditional networks and those that exist in SDN environment? In other word, do we have some special firewall devices that only ...
Alli's user avatar
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What does the load balancer shall have the ability to serve traffic over a static IP address mean?

I am doing research on SDN (Software Defined Networks), I do not understand the concepts of this question the load balancer shall have the ability to serve traffic over a static IP address I ...
Cin Sb Sangpi's user avatar
2 votes
1 answer
2k views

Finding the difference between flow tables in SDN and routing tables in traditional network

What is the essential difference between the flow tables in SDN-based switches and the conventional routing tables in the existing routers? In fact, I understood that the difference is in the routing ...
Michael's user avatar
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3 votes
2 answers
1k views

Problem with an n-host, zero-switch topology in mininet

I am experimenting a bit to gain a better understanding of Mininet and Openflow. I have built a topology with n hosts in a line and no switches. Strangely, host 1 and host 2 can ping each other but ...
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GTP support in OpenFlow

I know there is a "tunnel id" metadata matching field which was introduced in the 1.3 openflow release, if I'm not mistaken. However, are there any actions in supporting the encapsulation and ...
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OpenVSwitch OF1.4 Handle ARP as Normal L2/3 switch with RYU rest api [closed]

I want my OVS (which runs with OpenFlow14) to add flow entries for ARP with using the Ryu REST API. These ARP packets should be handled like a normal L2/3 switch. Setup of my bridge br0: sudo ...
muehsi's user avatar
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1 answer
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OpenFlow switching based on a specific ethertype

My goal is to send to a specific interface all ethernet traffic with a special ethertype. I have thus a virtual switch with OpenVSwitch on my interface eth0, and I use tap interfaces to retrieve ...
3isenHeim's user avatar
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2 answers
384 views

Matching a packet in OVS

I'm new to OVS and I'm working on an OVS project, and i read a lot of documents about it but i didn't find anything that can make things clear to me about matching a packet and in userspace and ...
Amrane Ait Zeouay's user avatar
1 vote
1 answer
1k views

Problem configuring QoS with FlowVisor and OpenVswitch

I am running a small experiment to isolate bandwidth with flowvisor (version 1.4, version 1.0 of openflow) implementing a port based slicing. With mininet, I create a topology that consists of a host ...
Guillermo C.'s user avatar
4 votes
2 answers
1k views

How do SDN controllers handle unknown packets?

In an SDN controller, when a new packet arrived to an OpenFlow-based router or switch and does not find a match flow entry in the OpenFlow flow tables, what does the SDN controller do? Does it just ...
Mike's user avatar
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3 votes
1 answer
717 views

Application aware routing in software defined network

For the last couple of months i am delving into SDN and trying to implement the application aware routing through SDN . Application aware routing: SDN controller will route each application data ...
psycho3's user avatar
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3 votes
3 answers
1k views

SDN vs OpenFlow

I'm a bit confused between Software-Defined Networks and OpenFlow. As far as I know, OpenFlow is just a protocol that manages the communication between the controlling plan and forwarding plan but I ...
Mike's user avatar
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2 votes
1 answer
685 views

OpenFlow Example: Is my understanding correct?

I have a question concerning an example of OpenFlow utilization for a campus network made in the paper: Open Flow: Enabling Innovation in Campus Networks. I will first quote the paper to provide some ...
Erwan Aaron's user avatar
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1 answer
205 views

SDN Controller aware of Vswitchs and physical network devices?

Imagine there is a topology which contains vswitchs on hypervisors and those are some how connected to outside physical network devices(I don't know whether this is possible or not...vswitchs and ...
Veerendra K's user avatar
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1 answer
5k views

What is Hidden Flows and MegaFlow in OVS?

Can someone explain, what is Hidden flows and MegaFlow with examples. Thanks
Veerendra K's user avatar
4 votes
2 answers
1k views

Default routing protocol used by SDN controllers

I am working with Open Daylight Hydrogen controller and I want to know which routing protocol does it use by default to set the path for a flow. Is it possible to know those paths? What about other ...
user8109's user avatar
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6 votes
2 answers
2k views

How does Openflow decide which path to use?

In current networks, OSPF ,RIP,etc determine the path taken by a packet. In SDN, the OpenFlow protocol sets the flow tables of the forwarding units. Can someone be very clear that how does OpenFlow ...
user8109's user avatar
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1 vote
1 answer
850 views

Get packet loss from Open Flow switch

I am using an Ryu controller (3.22) to monitor switches (Open vSwitch 2.0.2, supporting Open Flow 1.3), which are a part of virtual network created using mininet (2.1.0). It is a tree topology with ...
sinhayash's user avatar
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0 answers
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Overlay network with GRE without spanning tree [closed]

I need to create an overlay network with potential of hundreds of servers (each is an hypervisor and running a open vswitch). I'm going to use ovswitch and connect each server to all other servers ...
somdoron's user avatar
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5 votes
3 answers
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What's the difference between a traditional switch and OpenFlow Switch?

What's the difference between a traditional switch and OpenFlow Switch? I know that OpenFlow switch is used in Software-defined networking but am failing to understand why a OpenFlow switch is so ...
orange's user avatar
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4 votes
1 answer
2k views

Decoding packets in an OpenFlow ryu switch

I'm trying to examine a simple OpenFlow ryu switch, and get out of it the destination and source addresses. I'm using Mininet. For example for the next commands: h1 python -m SimpleHTTPServer 80 &...
Numerator's user avatar
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