How are switches connected to the SDN controller? Networking |
- How are switches connected to the SDN controller?
- Looking for some rack mount ears for cisco sg350-28
- Weird bandwidth cap on mGRE?
- How to troubleshoot network issues in industrial environments
- Passive scanning, possible to get firmware and OS details from endpoints?
| How are switches connected to the SDN controller? Posted: 03 Oct 2020 10:42 AM PDT While learning about SDN, I often come across this kind of diagram where the switches have some kind of virtual connection to the controller. But how does that translate in real life? Isn't there a bootstrapping issue for fully software-defined networks? Consider the following network: How will switch3 be able to receive instruction from the controller? Does someone manually configure within switch3's CLI what's the IP of the controller? Is there authentication? I guess another way to ask the question would be "What are the steps to set up from the ground up a full SDN network?". [link] [comments]  |
| Looking for some rack mount ears for cisco sg350-28 Posted: 03 Oct 2020 01:24 PM PDT Hi guys, Story: I purchased for a client 15 of the sg350 switches. unfortunately one of the boxes was damaged and the ears disappeared.... I have the option of a discount on the damaged bos switch (switch tests fine and no damage itself) or wait 5 weeks for a replacement (am in Chile and this is the wait time for getting these from the distributor). Getting a replacement through Amazon or someone else would be very expensive due to the price discount we got from the distributor. Need: I am looking for a set of SG350-28 rack mount ears with their screws. These are not the same as sg300 ears (thanks Cisco) of which there are lots of places to get them. I have had no luck anywhere finding replacement ears so I am hoping someone recently replaced some SG350 and has them laying around. I will pay for them and all shipping. Please let me know if you can help [link] [comments]  |
| Posted: 02 Oct 2020 05:40 PM PDT I have a mGRE tunnel at a datacenter on an ASR 1002-HX. There are over a dozen remotes connected with bandwidths varying up to over 100 Mbps for a remote. I implemented a couple of new remote sites via this hub tunnel but they couldn't go above 4-5 Mbps without their video streams breaking up. These remotes use ISR 1101s. Their ultimate destination is not the datacenter but another spoke (NHRP mGRE). Doesn't matter if it's direct spoke to spoke or via the hub, these specific remotes could not go above 4-5 Mbps. The egress at the remotes was indeed 8 Mbps (target bitrate) but by the time they got to a test box at the data center or destination spoke it was only 4-5 Mbps. If you drop the bitrate down to 4 Mbps, the stream works fine. Now here's the kicker. I built a DMVPN directly between remotes and it works fine over that. So there is something at the data center ASR that is capping the mGRE tunnels for these specific remotes only. Very strange. Anyone seen this before or have some insight? Reading around it doesn't seem like I've hit some sort of licensing or capabilities issues on the ASR. There is no egress QoS on the sending remotes interface. I'm stumped. [link] [comments]  |
| How to troubleshoot network issues in industrial environments Posted: 02 Oct 2020 05:47 PM PDT Hi I'm a PC programmer working in the automation industry. Our software communicates with several devices (PLCs, labelers, scanners etc), eventually one of the devices might have connection problems... This is where I begin to struggle because my knowledge of networking is kinda limited. I'm looking for tips and tricks on how to diagnose issues aside from using the classic ping command. I have Wireshark and TCPView installed but i use them in very a basic way. Here are some problems that happened recently, what should I check? 1) Can't connect to labeler socket from a NATted network but I can ping it. Socket connection works in a Lan. 2) Sometimes labeler socket communication drops and the only thing that fixes it is restarting the labeler. I'm not looking for specific solutions for the above-mentioned problems, I just mentioned them so you have an idea of what i usually deal with, any suggestion is appreciated. Thanks [link] [comments]  |
| Passive scanning, possible to get firmware and OS details from endpoints? Posted: 03 Oct 2020 12:46 AM PDT Hello In the world of OT, actively scanning endpoints is not possible because they will more than likely crash them. Crashing the OT devices could cause big issues. I've setup a rspan which is working and dumping everything, I'm wondering is there a way at all to collect firmware versions etc from this data? I've gone through the pcap using wireshark and can't see anything relating too the firmware, doing a active scan obviously you can get this info. Any advice is appreciated Thanks [link] [comments]  |
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