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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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 ...
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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 ...
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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 ...
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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 ?
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4 answers
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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 ...
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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 ...
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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 ...
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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 ...
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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-...
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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 ...
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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 ...
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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 ...
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925 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 ...
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3 answers
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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 ...
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360 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 ...
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2 answers
449 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 ?
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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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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?
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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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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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}|...
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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? ...
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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 ...
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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, ...
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1 answer
118 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 ...
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1 answer
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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?
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2 votes
0 answers
280 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 ...
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2 votes
2 answers
1k 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 ...
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283 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 ...
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1 vote
1 answer
863 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 ...
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1 vote
1 answer
42 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 ...
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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 ...
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2 votes
3 answers
977 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 ...
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2 answers
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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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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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2 votes
1 answer
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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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2 votes
3 answers
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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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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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2 votes
4 answers
895 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 ...
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3 votes
1 answer
423 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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2 votes
3 answers
221 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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2 votes
1 answer
268 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 ...
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2 votes
1 answer
354 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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2 answers
2k 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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1 vote
1 answer
849 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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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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