Blogpost Friday! Networking |
- Blogpost Friday!
- Wireless Point to Point solutions ~1km
- Small Enterprise Network Design Questions
- OC3 circuit L1/L2 Protection means?
- BGP Route with multiple AS_PATH Origins
- strategy for as needed wall jacks?
- Cisco 5520 WLC CIMC and SP Port Confusion
- Has anyone used Peplink products? Pros and cons vs other brands?
- Pre-owned Catalyst 4506 questions
- 3850-48XS with 4x10G Breakout Cable
- Proposal/agreement and Designated-Discarding (RSTP)
- Cisco EEM Scripting Help
- Is there any reliable place to sell a CAT6A Bundle?
- Aruba 3810M switch will not give directly connected Mitel Phones IP Addresses
- Urgent VLAN Question from a new IT guy
- Help with Oversize packets
- QOS Question
- False Linux ping command results
- MDS Switching
- Sales emails via ARIN contact info?
- New ISP link gradually getting faster?
- Using LAGs between switches with multiple LANs
- Cisco Prime monitoring Switches DELL
| Posted: 30 Aug 2018 05:16 PM PDT It's Read-only Friday! It is time to put your feet up, pour a nice dram and look through some of our member's new and shiny blog posts Feel free to submit your blog post and as well a nice description to this thread. [link] [comments]  |
| Wireless Point to Point solutions ~1km Posted: 31 Aug 2018 09:02 AM PDT Well, reddit, I fucked up and I could use your help. I run the network at a fairly affluent private college. There is a field on campus where they frequently pitch tents for events, parties, etc. They want wifi there. I looked at point-to-point bridges and found the ever-popular Ubiquiti AirFiber system. We also thought it would be good to get one to experiment with wireless backhaul in case of fiber cuts, DR, redundancy, etc. The price was good, so I bought an Airfiber 5 kit with two units. I didn't look at the size. Holy crap, this thing is 3ft tall and 35 lbs. Mounting is going to be a nightmare. Plus, we'll be shooting to the middle of the field to a cart and people will see this massive antenna array and start to wonder how much cancer they're going to get from it. Plus, with how they worry about building aesthetics here, I wonder if they would even let me hang this off a building at all. I have enough problems with my little outdoor WAPs. I wonder if I should just return it. So I may need a different solution or to argue that this is the only one feasible. Requirements are here:
Any thoughts? Should I look into using Aruba gear with a Yagi or dish antenna? Thanks in advance. Edit: totally meant to say 150 Mb/s . Good catch. Need more coffee. At least 150Mb/s that is. Prefer much more. [link] [comments]  |
| Small Enterprise Network Design Questions Posted: 31 Aug 2018 06:48 AM PDT Hi all, I'm hoping to get some help and feedback on how to best design (redesign?) my enterprise's network. I'm not aware of all the technologies available in our field - some I'm aware of but don't know well enough to be designing an enterprise network. I'm a recent college grad with my CCNA. I started recently at this organization and the network design seems off. Don't get me wrong, it's been working this way for years but I think we can do better. Where I struggle is wrapping my head around what to do in attempt to fix it. I'll do my best to explain the current state and end goals clearly. Any thoughts/comments/feedback/suggestions/etc are much appreciated. Current state:
IP Addressing Scheme:
Notes:
End Goals:
Questions:
I'm sure I've forgotten things that would help you all respond but hoping that questions will come up and I'll be able to edit the post to include more info. What I really want to get out of this post is to understand how dynamic routing can work in our environment. I mentioned all the other stuff just to make everyone aware of some other initiatives. In the end, it all needs to work together - which is where I'm struggling. Thanks for any help - it's much appreciated. Edit 00: Oh my gosh this formatting is horrendous. I apologize, trying to fix it currently. Edit 01: I SUCK at Reddit formatting. Also adding IP addressing - I forgot to put it in and realized it'd be helpful for some of the questions I have. Edit 02: I figured out that there is a new way to format on Reddit. It looks somewhat acceptable now. Sorry about that. [link] [comments]  |
| OC3 circuit L1/L2 Protection means? Posted: 31 Aug 2018 02:48 PM PDT Hi, I just want to ask if anyone is familiar here with Circuit protection? Is it with cisco devices/module? or for OC3 circuit? Thanks [link] [comments]  |
| BGP Route with multiple AS_PATH Origins Posted: 31 Aug 2018 02:45 PM PDT Hello Redditors, It's come to my desk a request that I find quite odd, but they want it done. Basically I have the prefix 192.168.0.0/24, this prefix is currently being originated by AS 1000 (the company I work for) and propagated via 3 upstreams. The owner of this prefix acquired his own AS (name it 2000), and now wants that the origin be his AS using us as transit (so the AS_PATH goes 1000 2000) so far nothing odd/weird. However out of the 3 transits, 1 won't accept our broadcasts unless the origin is our own AS (it's an internal policy they have). So they asked for us to peer with them and broadcast the prefix over all the providers but doing an AS_Overwrite when sending to the third one. All in all the world would see this: 192.168.0.0/24 AS_PATH_1: Provider1 1000 2000 AS_PATH_2: Provider2 1000 2000 AS_PATH_3: Provider3 1000 1000 (we'd prepend as well) Aside for the length of the AS_PATH, although technically this is doable, have any of you experienced a problem by doing this? (if you ever did). I mean those prefixes will get out there as long our upstreams accept these, but I'm afraid of potential issues with this over the internet. [link] [comments]  |
| strategy for as needed wall jacks? Posted: 31 Aug 2018 08:44 AM PDT So we have new management that doesn't like that we are wasting money by having all ports wired up. It makes closets beautiful and easy to manage as each patch panel matches a switch perfectly. Has anyone developed a scheme to connect as needed ports without making a mess? [link] [comments]  |
| Cisco 5520 WLC CIMC and SP Port Confusion Posted: 31 Aug 2018 12:27 PM PDT I've been researching and looking into deployment guides, but I still cannot find out what the recommended use of the CIMC or SP port is. Should the CIMC be used for out of band management or the SP port? Is there a certain way that each port should be configured? [link] [comments]  |
| Has anyone used Peplink products? Pros and cons vs other brands? Posted: 31 Aug 2018 08:30 AM PDT Anyone has any opinion on Peplink products and how these products fair in terms of quality, pricing vs other products? [link] [comments]  |
| Pre-owned Catalyst 4506 questions Posted: 31 Aug 2018 09:00 AM PDT Hello /r/networking, I have stumbled upon this pre-owned machine at my local computer store (see pictures). I am a noob who recently started an online course in networking on Udemy and I wanted to know what it is. The store owner has no idea what it is or what it's worth, he said he got it with some bulk purchase. From what I have found online it seems to be a managed switch called Cisco Catalyst 4506, within the 4500 series. There is no End-of-Sale date announced on the Cisco website, so I assume this machine should be up to date. There are a lot of different options within the 4500 series and I have no idea what this machine is worth. I tried looking on Ebay but prices vary so much that this information does not provide accuracy. Just one power supply alone could be worth $400. I hope this community can help me figure out:
a noob [link] [comments]  |
| 3850-48XS with 4x10G Breakout Cable Posted: 31 Aug 2018 05:18 AM PDT I've got the all SFP 3850-48XS running IOS-XE 16.3.6. In my application I wish to use one of these, a Cisco compatible QSFP-4X10G-AOCxM breakout cable: https://www.fs.com/products/30907.html The QSFP end will go in an available QSFP port in the 3850 and uplink to various access switches. So, I have the cable and the 3850 recognizes the cable successfully: I plugged the SFP+ port labeled #1 into a 2960X and it too successfully recognized the transceiver. The problem I'm having is configuring the 3850-48XS to use the 10G breakout interfaces TenG1/1/1 - 1/1/16 I tried issuing the following command: While the switch took this command it didn't deem to make a difference. I still only see the native TenG ports (1/0/1 - 1/0/48) and the FortyGig ports when checking interface status. I also see the following error after issuing the "hw-module" command: Does anyone know what the trick is to making this cable work in this switch? [link] [comments]  |
| Proposal/agreement and Designated-Discarding (RSTP) Posted: 31 Aug 2018 01:19 AM PDT Can anyone tell me, according to the standard, should all the Designated non-edge ports on a bridge go into sync (Discarding) when an Alternate port goes up? An explanation would be appreciated, too. I've been trying to understand the standard, but I just can't comprehend it. [link] [comments]  |
| Posted: 31 Aug 2018 06:01 AM PDT I've been trying to see if EEM scripting could be used for dynamic port configurations for Access Points. Fortunately, a script that configures a port based on CDP add event works great. Now I'm attempting to implement a script that resets a port configuration to "standard" if the AP is removed. However I'm running into a fun little issue. When APs are installing new code (or for other reasons I'm not aware) the APs CDP relationship gets wonky. The AP of course could reboot (which registers as a CDP delete) and the port is put back as standard. Then CDP add hits the port and the switch should be configured back to the AP config. But somewhere along the way, the add/delete process gets kind of messed up and I end up with an AP with a non-AP port config. Here's the script in question My thoughts are I need to make the script wait for a number of minutes, then check the port CDP a second time (after the initial CDP event) to validate if the there's an AP on the port. Of course if an AP is detected, exit the script with no action, but if there isn't a CDP entry, change the port configurations. Does anyone know if this possible in EEM? [link] [comments]  |
| Is there any reliable place to sell a CAT6A Bundle? Posted: 31 Aug 2018 12:44 PM PDT I work as an assistant in my work's IT department when i'm not running one of their print presses. They cleaned out their storage closet and they let me take a bundle of Superior Essex Cat 6A Plenum Cable that was shipped to them buy mistake. The shipping company would not take it back, and the production manager did not want us to hold on to it. My question is: other than just listing it on Craigslist or eBay, is there any reliable place that would buy this sort of thing? Would it be wise to ask a local business? I apologize if this isn't the appropriate subreddit to ask this kind of question, but I'm not sure where else to inquire about this. [link] [comments]  |
| Aruba 3810M switch will not give directly connected Mitel Phones IP Addresses Posted: 31 Aug 2018 10:47 AM PDT I have one location where I am replacing several Cisco switches with several HP devices. I have one Layer3 device that is an HP/Aruba 3810M and three Layer2 Devices that are HP/Aruba 2530 - 24G 's. These switches are in a hub and spoke configuration and all of the 2530's are directly downstream of the 3810. Our Mitel phones that are connected to the downstream 2530's are pulling IP addresses and functioning properly meaning that I can make and receive any internal or external phone calls. On the 3810, however, the mitel phones are failing to receive an IP address. I found this reply on a different web form: If your switch supports vlans, and can be configured with a tagged and untagged vlan on an interface, it should be compatible with most or all IP Phones. Typically, the phone will either be configured manually to use the voice vlan, or will recieve (initially on the data vlan) an option from DHCP that will let it know what vlan it should start tagging things with. Once it starts tagging things with the voice vlan, the switch only needs to support vlan tagging. One gotcha that I've found with Aruba switches is that by default when you enable LLDP the lldp tlv "network_policy" will be enabled. With that TLV enabled, and a "voice" vlan configured, a lot of phones will ignore what they get from DHCP in favor of what they get from there. That works fine, if you have configured it to hand out what they need, but if you prefer to use dhcp, make sure and use "no lldp config <port-range> medTlvEnable network_policy" (assuming that doesn't interfere with anything else) but I am uncertain if this is my issue. I know LLDP to some degree is enabled by default on HP Switches, but I have not enabled anything beyond the default. I am not able to test this out immediately, but I am hoping for a little more feedback first, anyway. Other things I have considered is adding an IP Helper address, but if that were the problem, I would think the down stream layer2 switches would exhibit the problem as well. Any help is greatly appreciated. [link] [comments]  |
| Urgent VLAN Question from a new IT guy Posted: 31 Aug 2018 09:39 AM PDT Hello! I've inherited the IT throne of my small business and have been learning quickly but am unclear on several things. Right now I just need to set up 2 Wi-Fi networks, one for guests and one for administration, segregated by VLANs. I have a router that supports VLANs, and I understand the purpose of VLANs and tagging, but their implementation mystifies me. I want to daisy chain a few wireless APs together and have them broadcast 2 SSIDs, one for each VLAN, as shown here : https://imgur.com/a/7w9pDZz . It seems simple but I haven't found anything useful online. Does anyone have a hint? [link] [comments]  |
| Posted: 31 Aug 2018 05:52 AM PDT Hi guys, just looking to see if i am on the right track here. I have 16 blade servers running a 1GB network on some Dell PCM6348's Before Wednesday night, all my servers had no VLAN tagging. On the switches i configured each port manually to tag them on VLAN 100 as this was the only VLAN we used. On Wednesday i configured more VLANs for blades 12-16, these were set on the server so i have a Virtual Switch with a VLAN of 100 and another Virtual Switch with a VLAN of 106. I didn't see any issues and things seemed to work. Queue Thursday morning, i come in to work and all hell is breaking loose. We have 2 applications that are crashing left and right and users are complaining its taking ages to save files to the network compared to normal. I moved all the data to different blades i hadn't changed and it all started to work normally again now. Looking in to it, under the port statistics for blades 12-16 i am getting millions of "Oversize Packets". Upon further reading i believe this is because the MTU is set to the default of 1518 and the VLAN tag adds 4 bytes making it 1522 which is too large. Does this sound right? Do i need to just globally up my MTU packets to 1522 and then change it at the port level also? Maybe i'm on the completely wrong path, however any help would be greatly appreciated! I am not really a network guy as we only have a couple of switches. [link] [comments]  |
| Posted: 31 Aug 2018 07:50 AM PDT Hi Guys, I would like to ask if in PE we are just matching default value and on CE their using Gold and Default. Do you think this will affect or degrade the assigned bandwidth? Topology: R1 -----Local Looop----- R2 Issue: R2 cant reach the assigned bandwidth of 1.5M band on the graph it stuck in 1.2 which im thinking that local loop provider do limit the incoming traffic from r1 to r2(vise versa)? Do you think below QOS affect the BW? ###### R1 ######### Class-map: class-default (match-any) 498442231 packets, 285894640418 bytes 30 second offered rate 70000 bps, drop rate 0000 bps Match: any police: cir 1500000 bps, bc 46875 bytes conformed 498442231 packets, 285894640418 bytes; actions: set-mpls-exp-imposition-transmit 5 exceeded 0 packets, 0 bytes; actions: drop conformed 70000 bps, exceeded 0000 bps ###### R2 ######### #sh policy-map int gi0/0 GigabitEthernet0/0 Service-policy output: G0/0_OUT Class-map: class-default (match-any) 1393735 packets, 483608471 bytes 30 second offered rate 171000 bps, drop rate 0000 bps Match: any Queueing queue limit 64 packets (queue depth/total drops/no-buffer drops) 0/158/0 (pkts output/bytes output) 1428782/534908617 shape (average) cir 1500000, bc 6000, be 6000 target shape rate 1500000 Service-policy : G0/0_CHILD_OUT Class-map: GOLD (match-any) 230899 packets, 45327523 bytes 30 second offered rate 12000 bps, drop rate 0000 bps Match: ip precedence 5 0 packets, 0 bytes 30 second rate 0 bps Match: ip dscp ef (46) 0 packets, 0 bytes 30 second rate 0 bps Match: dscp ef (46) 0 packets, 0 bytes 30 second rate 0 bps Match: access-group name ACL_Class_2A_AF11 143066 packets, 19484082 bytes 30 second rate 5000 bps Match: access-group name ACL_Class_2A_AF12 68838 packets, 21418191 bytes 30 second rate 7000 bps Match: access-group name ACL_Class_2A_AF13 17550 packets, 4004811 bytes 30 second rate 0 bps Match: access-group name ACL_Class_2B_AF21 1445 packets, 420439 bytes 30 second rate 0 bps Match: access-group name ACL_Class_2B_AF23 0 packets, 0 bytes 30 second rate 0 bps cir 1500000 bps, bc 46875 bytes conformed 230876 packets, 45292701 bytes; actions: set-prec-transmit 5 exceeded 23 packets, 34822 bytes; actions: drop conformed 12000 bps, exceeded 0000 bps Class-map: class-default (match-any) 1162836 packets, 438280948 bytes 30 second offered rate 158000 bps, drop rate 0000 bps Match: any Queueing queue limit 64 packets (queue depth/total drops/no-buffer drops/flowdrops) 0/158/0/0 (pkts output/bytes output) 1428782/534908617 Fair-queue: per-flow queue limit 16 packets Exp-weight-constant: 9 (1/512) Mean queue depth: 0 packets class Transmitted Random drop Tail/Flow drop Minimum Maximum Mark pkts/bytes pkts/bytes pkts/bytes thresh thresh prob 0 1196087/489420957 47/14330 108/5832 20 40 1/10 1 0/0 0/0 0/0 22 40 1/10 2 0/0 0/0 0/0 24 40 1/10 3 0/0 0/0 0/0 26 40 1/10 4 0/0 0/0 0/0 28 40 1/10 5 230873/45292447 0/0 3/254 30 40 1/10 6 1822/195213 0/0 0/0 32 40 1/10 7 0/0 0/0 0/0 34 40 1/10 Thank you [link] [comments]  |
| False Linux ping command results Posted: 31 Aug 2018 03:54 AM PDT I'm sorry if this is not the right subreddit to post this question but I couldn't think of a better place. I have a Python script that pings an array of IPv4 addresses. It uses the Linux ping command to do so. This script is called by a cronjob on a fixed interval. It usually works, but every now and then the script falsely reports that a host is unreachable when I know for a fact that it's not. I also have a Node.js script that does the same and it has the same problem. I've tried running the scripts on different machines in different countries and the problem still persists. When the script fails to ping a particular host, it retries 2 times, for a total of 3 attempts. If the 3rd attempt fails then it reports that the host cannot be reached. At first the scripts pinged 5 hosts asynchronously at a time but I've tried lowering that number down to 1. The two ping commands I've tried are "ping -c 5 <ip\_address>" and "ping -A -n -c 4 -w 2 <ip\_address>". I've run out of ideas. Does anyone have any suggestions as to what the problem could be? I'm desperate. [link] [comments]  |
| Posted: 30 Aug 2018 11:21 PM PDT For anyone that configures MDS switches what was your primary source for learning the cli? Cisco documentation? A book? Thanks. [link] [comments]  |
| Sales emails via ARIN contact info? Posted: 30 Aug 2018 06:13 PM PDT I just got a sales email asking of I was in charge of ASXXXXX and if I was interested of using XXX service. First time for me, Anyone else get thees? Edit: so I guess I'm lucky I haven been getting them all along. ugh.. [link] [comments]  |
| New ISP link gradually getting faster? Posted: 31 Aug 2018 07:24 AM PDT I am seeing some pretty odd behavior on a new internet link and was wondering if other people have seen something similar in the past. Topology: 2x Juniper MX routers, one internet peer each (Charter 2 Gbps, ATT 500 mbps). We have local pref in place to push all outbound traffic that isn't destined for ATT networks to go over the Charter link. We have 4 prepends in place on the ATT peer link so incoming traffic should prefer the Charter link. Both MXs are iBGP peers. The Charter link just went live a few days ago. Day One: 13/200 Mpbs when doing a basic speedtest via speedtest.net. Day Two: 35/400 Mbps. Day Three: 213/836 Mbps. On day one we thought it might have been a bad cable or a faulty optic, but that didn't seem to change anything. The DL speed I could maybe guess as other AS routing tables slowly updating to prefer the Charter path, but I would have expected upload traffic to have immediately preferred the Charter link. Any ideas as to what we might be seeing? [link] [comments]  |
| Using LAGs between switches with multiple LANs Posted: 30 Aug 2018 04:42 PM PDT Greetings Internet brain. Pardon the ignorance, but I need some advice from someone who understands this stuff better than I do - breaking this stuff down in layman's terms would be helpful to me. I am trying to recreate a network with several managed switches that use multiple VLANs. I need VLAN 1 on Switch 1 to communicate with VLAN 1 on Switch 2 and VLAN 2 on Switch 1 to communicate with VLAN 2 on Switch 2 and so on. I have the impression that connecting VLAN 1 and VLAN 2 between the two switches will not work because of a network loop and that my best option is to use a LAG. I can tell my predecessor used a LAG for this purpose because Switch 1 is still configured from the previous time this network was created, however I don't have a proper understanding of how a LAG works or how to configure one. I assume LAG Port 1 on Switch 1 (1-1) connects to LAG Port 1 on Switch 2 (2-1) and 1-2 to 2-2. I can tell from the existing configuration that 1-1 and 1-2 were both on VLAN 3. Does that mean 2-1 and 2-2 need to be on VLAN 3? If so, how does VLAN 1 and 2 travel between the switches? I feel like I'm not fully understanding the concept of a LAG. Do I need to assign VLANs to the LAG (if so, how?)? Does it matter which VLAN the LAG ports are assigned to? A lesser concern is making sure that only VLAN 3 can access the switches. Switch 1 is Netgear GS2728TPP and Switch 2 is Netgear GS108T. I'd love to learn more about the concepts behind making this work beyond just finding a solution. Thank you so much. I hope there's someone out there who's enthusiastic about sharing this knowledge. edit: I understand now that VLANs and LAGs are completely separate and unrelated concepts (thanks!). To summarize my end goal -- How can I get 2 or more VLANs between 2 Netgear switches connected via a LAG? edit2: Thank you so much everybody who's helped out so far. I obviously had a huge lack of understanding of the basic concepts behind trunking, VLANs and LAGs. With all these responses I feel better equipped to give it another shot today. I'll update again hopefully with a success story! [link] [comments]  |
| Cisco Prime monitoring Switches DELL Posted: 30 Aug 2018 07:11 PM PDT I want to know if I can monitoring my Dell switches using MIBs as a custom device or using SNMP v2. Found this guide But I have read that even using open standards. Sometimes Cisco Prime couldn't recognise the device. Any experience with Dell switches? [link] [comments]  |
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