Questions tagged [sdn]

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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Difference between SDN and Network Automation

What is the difference between Software-Defined Networking and Network Automation? If you are managing your routers and switches using tools like Puppet or Ansible, or by using bash scripts or python ...
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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 (...
Osama Abuhamdan's user avatar
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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 ...
fractal397's user avatar
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1 answer
411 views

[Mininet/Miniedit]: Can't get the host machines connected via a router to ping each other [closed]

As a part of an experiment, my network has the following topology for two host machines connected to a router in mininet(on Ubuntu 22.04.02 Virtual Machine) h1 - r1 - h2 The host Machine 'h1' ...
Toshitt Ahuja's user avatar
1 vote
3 answers
190 views

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?...
Noob_Guy's user avatar
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Software Defined Networking (SDN): What is line-speed?

I can't understand what is meant by line-speed. From a networking point of view, we can say that line-speed is the number of packets transmitted in a unit of time. I got this term from here: link of ...
user2994783's user avatar
3 votes
2 answers
230 views

what is meaning of MPLS when compared to SD-WAN? is it dedicated MPLS or MPLS VPNs

SD-WAN is always compared with MPLS, but it is not clear to me what is the meaning of MPLS in this context. My ambiguity is between these cases. MPLS VPN services provided and managed by operators ...
shahriar's user avatar
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1 answer
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Basic question on 'network history based routing tables'

I have encountered the following sequence of words: 'routing table formed on the basis of network history information'. I know that initially, routers discover neighbor nodes and therby the possible ...
knowledge_seeker's user avatar
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1 answer
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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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Monitor network link to get bandwidth and/or latency variations

I have a controlled SDN lab scenario where I have a control plane and a data plane. The network is composed by: A switch 2 pc connected to the switch for the data plane A controller pc connected to ...
Mellgood's user avatar
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SD-WAN edge and physical high-end router

Are physical routers, who have different management interfaces (SNMP, NETCONF, and so on), able to speak to an SD-WAN controller? In other words, can I have an SD-WAN by establishing a specific SD-WAN ...
A.A's user avatar
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2 answers
311 views

Steps for upgrading to Cisco DNA Center?

Has Anyone upgraded from cisco Prime to Cisco DNAC, if so then Does anyone have Steps (Prep Work) checklist suggestions before beginning the Brownfield Deployment of Cisco DNAC ?
DeathS7roke's user avatar
2 votes
4 answers
202 views

What exactly is "network automation"?

When we say network automation, what "automation" are we talking about? What is that being automated? I've heard that in network automation we do not have to configure each individual ...
Noob_Guy's user avatar
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1 answer
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SD-Access -only VNIs and SGTs for policy enforcement within the fabric?

I’m currently getting myself up to speed with Cisco SD-Access. Particularly policy enforcement. Am I right in saying that as SD-Access utilises VNIs and SGTs from which to enforce policies. Then only ...
Aidan Venn's user avatar
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107 views

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
2 votes
1 answer
90 views

Why do we need machine learning for QoS classification in SDNs if we have DSCP in IP address for QoS enforcement?

DiffServ (Differentiated services) uses a 6-bit differentiated services code point (DSCP) in the 8-bit differentiated services field (DS field) in the IP header for packet classification purposes. If ...
boomselector's user avatar
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Can Northbound interfaces (REST API) in a Software Defined Network (SDN) be used to manipulate QoS parameters?

I am working on a project involving Quality of Service (QoS) manipulation in Software Defined Networks (SDNs). I know that the following parameters affect the QoS in an SDN: Time information (inter-...
boomselector's user avatar
1 vote
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95 views

Are LAPD reliability and flow-control messages (e.g. RR and RNR) considered to be data-plane or control-plane messages?

Ethernet, IPv4, IPv6, MPLS are all examples of datagram networks where each frame or packet is forwarded in a mostly stateless manner, independent of earlier and later packets. In such networks the ...
Bruno Rijsman's user avatar
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1 answer
241 views

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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1 answer
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How to traceroute in SDN Networks while traceroute is not working in SDN by default?

I have used all opendaylight, floodlight and POX controllers one by one in my SDN ring topology which is created by mininet, but I am not able to use traceroute command and trace the paths where the ...
Ramin Ramesh's user avatar
1 vote
1 answer
1k views

What layers of the TCP/IP model does an SDN involve?

New to Software-Defined Networks. I know that an SDN involves an Application plane, a control plane and infrastructure plane. By definition, I know that the application plane is in the Application ...
boomselector's user avatar
5 votes
3 answers
5k views

How does Deep Packet Inspection work with encrypted packets?

I've been reading up on Deep Packet Inspection for Software Defined Networks. However, I know that some applications use encryption to evade Deep Packet Inspection. Is there any alternative (such as ...
boomselector's user avatar
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1 answer
645 views

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 ...
boomselector's user avatar
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658 views

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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1 answer
91 views

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=...
nimdrak's user avatar
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1 answer
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How to implement port security in SDN using pox controller and ovs?

How can I defend against DHCP starvation attacks or MAC spoofing in an SDN environment?
Waleed Allam's user avatar
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1 answer
234 views

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 ...
EnDorphin's user avatar
1 vote
0 answers
203 views

which module of floodlight does routing? [closed]

I recently started working with floodlight controller. Floodlight use Dijkstra algorithm to obtain a route between source and destination. I want to know which module of floodlight does routing and ...
ali's user avatar
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1 vote
1 answer
107 views

SDN Flow-modification attack

What are the steps that can be taken to prevent flow-modification attacks on an SDN controller? The attack would look as follows(As seen by the image): Does OpenDaylight or any other controller have ...
Deepal's user avatar
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1 vote
2 answers
218 views

what is the difference between OpenFlow queue and 802.1p

I was reading about queues and I came across OpenFlow Queues and IEEE 802.1p I would like to know what are the main differences between them, and how they treat the traffic. In other words how they ...
Corey's user avatar
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1 answer
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How to aggregate four upstream ports in the network module?

Using SuperMicro network module, which related to Intel SDN product, the command PDF . and the Web GUI manual. there I have qe57, qe61, qe65, qe69 four upstream ports, I want to aggregate them. how ...
244boy's user avatar
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1 vote
1 answer
321 views

Whats the meaning of `802.1Q tunnel customer VLAN mapping` and `802.1Q tunnel provider VLAN mapping`?

Whats the meaning of 802.1Q tunnel customer VLAN mapping and 802.1Q tunnel provider VLAN mapping? Shows 802.1Q (QinQ) tunnel information. 802.1Q tunneling allows layer 2 VPN connectivity between ...
244boy's user avatar
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What's the usage of `Data center bridging`?

show dcb app show clock Privileged Mode # Displays DCB (Data center bridging) application data. Command Syntax Command Modes Syntax Description Command Default Examples show dcb app {local status|map}|...
244boy's user avatar
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If physical switches are necessary in a SDN

Exploring how to implement a Software Defined Network and here it explains that an SDN switch is only dealing with the data layer. But then: Do We Need Special SDN Switches for SDN Networking? ...
Lance's user avatar
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1 answer
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If Network Operating Systems or Virtualized Networks are installed on regular computers [closed]

I am learning about SDN and Network Operating Systems and Virtual Networks. I am confused about where the actual code that runs exists. Like when you have an application like a website, it runs on a ...
Lance's user avatar
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0 votes
1 answer
338 views

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
1 vote
1 answer
127 views

VMWARE NSX Networking

I have configured in a lab logical switch, distributed router, distributed firewall and everything is work fine. But then I thing about real live environment I am a little bit confused about VTEPs ...
orkhan's user avatar
  • 11
1 vote
1 answer
145 views

Is the same vCPE as SD-WAN?

I am a little bit confused about both terms, since doing research they are being used interchangeably. Does someone can give an exact definition, or even better, examples?
heavymeza's user avatar
2 votes
0 answers
448 views

OpenvSwitch port-security on physical interface [closed]

I want to secure ports on OVS and allow specific clients source MAC addresses to an interface, to improve security on my network, Here is my scenario: ovs box with 4 physical port, port1 connected ...
New Dude's user avatar
2 votes
2 answers
2k views

OpenvSwitch Spanning-tree priority for specific Vlan ID

I'm new to the SDN technology, I have 12 year's experience working with Cisco products, On Cisco devices, a user can set different STP priority Per VLAN ID Like : Switch(config)#spanning-tree VLAN ...
New Dude's user avatar
0 votes
1 answer
342 views

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 ...
user3768971's user avatar
1 vote
1 answer
1k views

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
1 vote
1 answer
49 views

data transfer to another domain

I want to have a simple multi-domain topology in mininet in which each domain is controlled by a single controller. I'm using Floodlight controller and OVS (switches). Imagine this topology: c1 ...
helen's user avatar
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1 answer
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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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2 votes
3 answers
1k views

What is the difference between a Network Operating System and an SDN controller?

I've been trying to understand the difference between an NOS and an SDN Controller, because in many sources, this term is used interchangeably. For example: https://arxiv.org/pdf/1406.0440.pdf But ...
Michael's user avatar
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1 vote
2 answers
397 views

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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0 votes
1 answer
398 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 --...
Sainath's user avatar
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2 votes
1 answer
50 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 ...
fsociety's user avatar
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2 votes
3 answers
2k 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 ...
Kosovic's user avatar
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1 vote
0 answers
131 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 ...
ironman's user avatar
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