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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3 votes
2 answers
113 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 ...
1 vote
1 answer
48 views

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 ...
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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 ...
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1 answer
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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 ...
0 votes
1 answer
40 views

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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2 answers
197 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 ?
2 votes
4 answers
184 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 ...
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1 vote
1 answer
50 views

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 ...
0 votes
0 answers
79 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 ...
2 votes
1 answer
72 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 ...
0 votes
2 answers
100 views

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-...
1 vote
0 answers
79 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 ...
0 votes
1 answer
214 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 ...
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1 vote
1 answer
665 views

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 ...
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 ...
4 votes
3 answers
4k 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 ...
0 votes
1 answer
425 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 ...
0 votes
2 answers
504 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 ?
0 votes
1 answer
77 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=...
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3 votes
1 answer
258 views

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?
0 votes
1 answer
170 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 ...
1 vote
0 answers
176 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 ...
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1 vote
1 answer
70 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 ...
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1 vote
2 answers
201 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 ...
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0 votes
1 answer
42 views

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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1 vote
1 answer
311 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 ...
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0 votes
1 answer
249 views

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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1 answer
341 views

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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1 answer
18 views

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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0 votes
1 answer
266 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, ...
1 vote
1 answer
120 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 vote
1 answer
124 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?
2 votes
0 answers
307 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 ...
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 ...
0 votes
1 answer
296 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 ...
1 vote
1 answer
899 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 ...
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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0 votes
1 answer
383 views

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
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 ...
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1 vote
2 answers
330 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 ...
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0 votes
1 answer
367 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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2 votes
1 answer
49 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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2 votes
3 answers
1k 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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1 vote
0 answers
126 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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2 votes
4 answers
902 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
451 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 ...
2 votes
3 answers
226 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 ...
2 votes
1 answer
284 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 ...
2 votes
1 answer
363 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-...
0 votes
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 ...