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For questions about Software-defined networking (SDN), an approach to networking architecture that separates the control plane from the forwarding plane, with the network control logic implemented in software-based controllers.

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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 ...
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1answer
21 views

Add a flow to OVSK for communication

I have created a torus topology in mininet by enabling sflow and connecting to POX controller for topology discovery. Below is the command. sudo mn --custom=sflow-rt/extras/sflow.py --link tc,bw=10 --...
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1answer
40 views

Regarding Tier0 switch to downstream servers connectivity

I have been reading up on the connectivity patterns of tier0 switch to the downstream servers in a cloud environment(e.g. AWS, Google clouds), however, I am curious to understand why none of the cloud ...
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2answers
54 views

What is a Logically Centralised Controller in SDN

I am learning about SDN and networking, and then I reach a point where I see: SDN has a logically-centralised controller My Question: does logically-centralised controller refer to, the fact that ...
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0answers
26 views

What is the difference between SDN node and SDN enabled Base station? [closed]

I am pretty sure every network engineer would have heard about "SDN" i.e. Software Defined Network, the base of 5G network. Very soon we will be enjoying 5G in our smartphone :) I have a doubt ...
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3answers
79 views

If routing protocol in physical routers in SDN network?

In SDN network, there are control and data planes. I want to know if routing protocol runs in routers in data transfer plane? If that,there is no difference with tradition network. Or the routing ...
3
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1answer
59 views

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 ...
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3answers
71 views

Can SDN controllers inject or delete routes in a router?

I have seen that some SDN controllers implement a BGP plugin in their architecture (for instance, Opendaylight). But, since controllers do not sent or route packets, I wonder how and if they can ...
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0answers
49 views

Dynamic adding host with a quagga service MiniNExT object

I am using MiniNExT to emulate a network topology with Quagga routers. I cannot create a topo class and pass to MiniNExT as shown here since the network changes dynamically. Is there a way to add a ...
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1answer
70 views

Deploying Dijkstra's Algorithm in a Fat Tree Topology!

I am trying to deploy Dijkstra's Algorithm for finding the shortest path between switches in a balanced fat-tree topology. The problem is that I do not know what values/unit of weight should be in ...
1
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1answer
96 views

VXLAN ingress replication limitations?

I've been trying to search for data on the scaling figures of the various network ASICs with regards to the maximum number of remote VTEPs they can handle when doing ingress-replication (a.k.a. Head-...
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2answers
88 views

Do we need different VLANs on IPv6 network? [closed]

With IPv6 there's new train of thought around this technology than IPv4. Since this protocol does away with broadcasts, is creating different VLANs necessary? Some people will argue that you can apply ...
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1answer
183 views

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 ...
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1answer
51 views

Default Action in SDN Controller

In legacy IPv4 networks there exists a default route concept for routers where a router does not need to know exact destination of IP packet. Is there a default action concept for SDN switches? Let ...
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0answers
258 views

installing ONIE on Quanta LB6M for Cumulus OS

Is it possible to change Quanta LB6M into cumulus OS ? If it posibble is there any suggestion to do it ? im little frustrating to find a guide for whole week After some research i found Quanta LB9 ...
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0answers
204 views

Ryu book Example of the operation of QoS by using Meter Table doesn't work

I am using mininet with Ryu controller. I almost followed the same procedure as explained in the Ryu book for Example of the operation of QoS by using Meter Table but I made a little modification in ...
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0answers
16 views

After I configured Brocade Vyatta controller IP and port on Open V Switch, the connection between vyatta router 1 and vyatta router 2 was failed

I'm new to Brocade vyatta controller and Open V Switch. I have made the following topology: **Brocade vyatta controller | | Open V Switch ...
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0answers
34 views

how to analyzing the overall congestion in the network

I am new to networking and I was trying to analyze congestion in a SDN emulated network using port stats message. Using ofp_port_stats message I can get any port's transmitted packet drops, received ...
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2answers
317 views

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=...
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4answers
992 views

Are routers used in Software Defined Network?

I have two questions :: I have read some papers on Software defined network. Every time I see that they work with switches. I want to know Cant we implement SDN with routers ? What are the metrics ...
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1answer
86 views

SDN for Highly Dynamic Moving Networks

Forgive me for asking this question. I am trying to see how SDN paradigm can be applied to highly dynamic networks, i.e., vehicular networks. If we consider vehicles as edges in a network, (i.e., the ...
6
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4answers
511 views

What exactly is the difference between SDN & NFV?

What is the difference between SDN (Software Defined Networking) & NFV (Network Function Virtualization)? Wikipedia says NFV relies on standard client-server model. How is this model different ...
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0answers
24 views

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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3answers
750 views

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,...
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3answers
455 views

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/...
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3answers
65 views

How is Service chaining different from network functions virtualization?

From what i understand, both focus on replacing the traditionally implemented proprietary hardware services such as firewalls , NAT ,etc and try to implement it in software. So how do the two differ ...
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2answers
286 views

Priority queueing in openvswitch

When implementing QOS in openvSwitch there is an option in Configuration for linux-htb QoS : other_config : priority The description for this option in the ovs documentation is : other_config : ...
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1answer
156 views

Software defined system

Over (Software defined network) what will happen when unknown Ethernet hits the first switch, using 4 OF switch and 8 host.
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2answers
116 views

SDN for wireless network

I have been reading about Software-Defined Networking (SDN) for a while. I have a question: Is SDN made only for wired networks capability? I wonder if SDN can be utilized in wireless networks.
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1answer
388 views

How to capture GTP-C Traffic using mininet? [closed]

I am trying to capture the GTP-C packet, I am using Scapy to generate GTP-C Packet. But I could not find any good tutorial related to "How to use Scapy?"
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1answer
2k views

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.
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1answer
51 views

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 ...
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1answer
79 views

Unknown Unicast Flooding Attack in Software Defined Networking

Is the the Unknown Unicast Flooding Attack still exists in Software Defined Networking. If not, how it was eliminated ?
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1answer
54 views

The actual definition of network configuration

I've read this SDN paper that mainly discusses: Malicious administrator problem, where a network administrator misconfigures a correctly functioning controller in a way that adversely affects ...
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1answer
124 views

Regarding NETCONF

I am trying for basic operations on IOS-XR (Cisco) using Netconf.This includes initially setting up a netconf connection as below: ssh [hostname] -p 830 -s netconf As soon as, the connection is ...
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1answer
324 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....
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1answer
35 views

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 ...
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4answers
617 views

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 ...
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1answer
24 views

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 ...
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1answer
624 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 ...
0
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1answer
58 views

How overlay network has led to the other network virtualization techniques [closed]

When taking about virtualization in computer networks, can we argue that Overlay Network is the baseline of plenty of virtual networking techniques such as VPN, vLAN, peer-to-peer, and currently SDN? ...
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1answer
850 views

Can SDN work with the conventional switches?

In an abstract way, Software Defined Networking controls the forwarding plane elements remotely for the purpose of determining communication path and other controlling matters. I learned that SDN ...
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1answer
145 views

FlowVisor Slices

Good day all! I encountered a problem while I was running flowvisor In mininet. The same problem occurred also when I tried running it on different VM (Ubuntu server 14.04). I was able to install ...
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2answers
439 views

Problem with a 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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1answer
113 views

How to send rate control packet in TCP/IP model?

How to send rate control(250Kb/s, 500Kb/s) packet in TCP/IP stack? Because In my understanding after tcp buffer filled then the Tx packets happening. Is my understanding is correct then How do I send ...
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0answers
236 views

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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2answers
380 views

Fiber Network Bandwidth Control without Radius/PPPoE (Service Provider-Limit Client Bandwidth)

I have been reading and watching some information regarding fiber networks and their deployment. One interesting point that was raised was that in a fiber network generally a DHCP server is used for ...
0
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1answer
371 views

Load Balancing System For 2 Servers on Different Datacenters [closed]

I am using Ubuntu 15 and I need to implement simple/effective Load Balancer / Fail Over System as per the below requirements: a. It should balance the load between two different public IPs (two ...
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1answer
7k views

Difference between Linux Bridge and Open vSwitch

What are the most significant differences between how a Linux bridge and an Open vSwitch work?
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1answer
958 views

How to create Geneve tunnel with OpenvSwitch?

In case, two physical hosts have one of OpenvSwitch bridge each other. remote server ip: 1.1.1.1 local server ip: 2.2.2.2 How to connect two OpenvSwitch bridge by geneve? and how to validate packet?