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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1answer
22 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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23 views

How many Flow Tables can be used in OpenFlow 1.0.0

I came across a document, saying that we can use goto instructions, and direct a packet from Table-0 to Table-1. I am particularly using OpenFlow 1.0.0 (because POX Controller supports 1.0.0 only) I ...
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34 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?
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1answer
30 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 ...
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0answers
54 views

which module of floodlight does routing?

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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1answer
50 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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2answers
79 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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1answer
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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1answer
150 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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1answer
66 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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1answer
95 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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1answer
17 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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1answer
77 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, ...
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1answer
59 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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1answer
63 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?
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0answers
145 views

OpenvSwitch port-security on physical interface

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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2answers
384 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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1answer
114 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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1answer
335 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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1answer
33 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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1answer
245 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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3answers
338 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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2answers
164 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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1answer
103 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
44 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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3answers
309 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
79 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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4answers
510 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
166 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
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3answers
158 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
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1answer
168 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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1answer
266 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
567 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
488 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
76 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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2answers
667 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
2k 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
94 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 ...
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4answers
718 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
32 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
1k 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,...
2
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3answers
737 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
80 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
489 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
160 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
168 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
794 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
3k 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
93 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
114 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 ?