Cisco WAN :: 3750 QoS Causing Slow Data Transfers
Aug 22, 2012
I am a new network admin at my company, and I am investigating a problem that is on a network designed by someone no longer here. So, I can't ask why things were set up the way they were. Anyway, here's the issue:
We have 50Mbps WAN connections between locations. The WAN devices are 3750s, but the port plugged into the providers network is a layer 3 port. Config is below for one of the ports: [code]
So, these are Gig ports, but our service provider limits to 50Mbps. When we do a data transfer, we can't exceed about 20Mbps total on the circuit. The data transfers at maximum 15-16Mbps.
I'm not familiar with QoS. I've tried to read more about SRR, but don't understand it well enough to know. Are the QoS settings creating this restriction? Our provider swears that the bandwidth is allocated and its not being choked on their end. I have not taken off the QoS config to test it that way because I'm not 100% sure if its needed and serving some purpose. I don't want to break something in order to fix this.
Is the QoS causing this? Do I need to put a bandwidth statement on the port? Should we be using routers and LLQ?
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May 31, 2012
This is a new RV180 install. FTP data transfers fail in binary mode. By fail I mean the first packet sent, isn't accepted (acknowledged?) by the FTP server (Network Solutions, Passive Mode), . If I pull the router and replace it with an old D link router or 5th gen Apple Airport Extreme, everything else the same, it works OK. I lack the tools and knowledge to proceed beyond this point.
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Jan 24, 2012
I plan on starting a high speed LAN for my Gaming LAN party's. We send 100's of GB of data over our LAN networking when we do this, so i need a good switch that can handle the stress of the massive data transfers. It needs to be a gigabit switch and at least 8 RJ45 ports.or is there a different one i should get all together? i cant spend a butt load. url...
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Feb 17, 2012
Recently purchased a Linksys E4200.Computers on network:Two hard-wired gigabit desktops: one Windows XP, one Windows 7One hard-wired 100mbps desktop running Windows 7One laptop with an Intel 4965AGN running Windows 7.File transfer rates between any of the desktops and the laptop is very slow: ~2 megabytes/s
File transfer rates between the gigabit desktops is good (~50 megabytes/s, hdd bottleneck), transfers between the 100mbps desktop and one of the gigabit machines gives ~10 megabytes/s.Currently running on the 5Ghz band, connected with N at 300 megabits, good signal strength. Disabled mixed mode on this band, enabled N-only.Use a scanner tool, I can tell that there are no other networks on 5Ghz band.Also, tried 2.4 Ghz band and got similiar low speeds.These transfer rates are much below what other people report for real-world throughput. Any ideas? I know there is an Advanced Wireless config page, is there a setting there that might work if adjusted?
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Jan 3, 2013
decided first of all to connect an old router to the master (but not test) socket together with different cabling & splitter/microfilter - everything starting working almost perfectly (apart from downstream data rate was considerably lower than expected each time I connected - between about 1400 & 1600 Kbps - I have max. 8 Mbps).when I connected back my current router everything continued to be OK (apart from low downstream data rate) - until I would restart the current router and everything went back to very very slow.
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Jun 10, 2011
I have been using my DIR-655 for about 2 weeks now with Road Runner wideband services. Starting yesterday my internet became very slow and I discovered the cause was the router. I tried resetting it to factory settings and things will be fine and run smoothly for about 5-15 minutes but after that it goes back to being extremely slow. My speed tests would go from 10ms (normal) to 250-450ms. Before this issue occurred the Dlink was perfect, had full speeds. I am running a wire Ethernet connection.
I am currently using revB and tried upgrading firmware to 2.01NA which had no effect, but make my internet seemingly go back to normal for the first few minutes then nosedive again.I have also changed my speed/duplex settings in Network Config to 1gbs Full Duplex. I've also disabled QoS, and still no change. Not sure what else to do.
When directly connected to the modem everything seems fine. The modem is also the provided Motorola SBG6580 which I have called Time Warner to set the modem into bridge mode and have the DIR-655 connected to it.
With DIR-655 connected to PC
With Modem connected to PC
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Apr 16, 2013
I'm baffled by the poor performance that I'm seeing when passing traffic between my two Cisco SG switches.
The configuration is as basic as I can make it, no VLANs, QoS or bonding. Both have been updated to current firmware as part of the troubleshooting process.
When I transfer data within one of my switches I see 50/60Mb/s. When I pass the same traffic between both switches I see 0.6 Mbs/ or less.
I have tried to eliminate every possible factor including switching out the cables. No success.
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May 4, 2012
I have 2 computers on a network, and 3 devices that use wifi on the same network. Basically when ever computer A is connected, every single computer or device on the network runs extremely slow, if at all. I get anywhere between 1200-2000 ping on pingtest with 2-60% packet loss. Even the speed on the "infected" computer A downloads extremely slow. I'm at a loss for this problem, everything runs slow and its because of the one computer connected to it. I have virus software on this computer, but its not the best so i'm not ruling out malware or viruses right off the bat.
Devices: Blackberry, Iphone, macbook (all wifi)
Computer A
Runs windows xp 32 bit,
amd processor
onboard video
[code].....
The internet modem runs to a router (Dlink dir615) then to a switch (or hub, if you will) and then to the 2 computers. The entire problem is solved by unplugging computer A from the system. But other than that I have no alternative.
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Feb 15, 2012
I am using virginmedia superhub which is supposed to give me a max of 30mbps. I use it wireless but am often getting fluctuations in speed - sometimes 500kbps upto 20mbps, nothing consistently close over 20mbps or close to 30mbps. I have bought a powerline kit - "develo olan 200 AV Wireless N" which has improved the speed but I still get fluctuations.
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May 11, 2011
This only started about a week ago and everything was working fine before then. My router is causing my internet to be slow (I know this because it goes at normal speed when I am connected directly to my modem)
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Jun 30, 2011
For some reason, I have been trying to use QOS for several network related jobs (VPN, streaming). It would seem that when QOS is enabled and the appropriate ports are set which a high priority, the speed of my connection drops to a crawl. When I disable QOS, I'm flying again. I have confirmed ports, and protocol types (TCP or UDP) and nothing seems to work.
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Mar 8, 2011
I have a Cisco 871w that has been a very great product for many years. I recently switched to Windows 7 x64 on my main machine and now i am having all sorts of issues with it.. I have done a bit of research and found that it appears that it might be the firewall on the SDM that is causing the slowness issues. what does happen is that downloads from known good sites will run really slow. If i hook up my Macbook Pro or my Windows XP laptop i have no issues at all. i have tried Disabling IPv6 as well as SMB2.0 and this has not resulted in a fix at this point.
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Feb 7, 2011
I am trying to connect a cisco catalyst 3750g-48ts with our exsiting 3com corebuilder 9000 using the SFP ports, I have established a link and the interface is up.
The issue is that no data is passing through between the two, everything looks like it's up and enabled, spanning tree has detected the uplink port and has automatically set it to forward, both devices suggest the link is in place and the lights are on .
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Nov 26, 2012
We recently purchased two 3750-X 48-port switches. We are in the process of connecting the Data Stack and StackPower cables. The question we have is what is the recommended Data Stack and Power Stack cable configuration if you only have two switches? All of the documentation that we have seen is for three or more switches.
Data Stack: Our assumption is that we will go from Stack 1 on the top switch to Stack 2 on the bottom switch. Do we need to then connect another cable from Stack 2 on the top switch to Stack 1 on the bottom switch? We would think not, but figure we should check. We plan on adding another three in the next budget year, which starts in May.
StackPower: Our assumption is that we will go from S-PWR on the top switch to S-PWR XPS on the bottom switch. Do we need to then connect another cable from S-PWR XPS on the top switch to S-PWR on the bottom switch? We would think not, but figure we should check.
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May 16, 2013
I've recently upgraded the configuration on one of our 1130 series standalone access points. I've implemented RADIUS authentication, WPA2 encryption etc. in an effort to make our network more secure. While this part seems to be working as planned, our data transfer speeds have taken a major hit. On our test AP, with only one laptop connected, the laptop will report a connection at 54 Mbits. When using any speed test service the speed reported is approximately 15 Mbits. We have 100 Mbit internet, and desktops connected to ethernet show much higher speeds. When transferring files via our own LAN, data transfer rates average approximately 2 Mbytes/second. I've tested this on 3 separate laptops, some relatively new, and it seems they all get the same speeds.
Long story short, our wireless seems to be operating under a third of its reported speed.
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Jan 16, 2013
I am experiencing strange problem about slowing down the internet speed after downloading is stopped in between. I then have reboot the desktop to regain the speed.
My networking as below:
DSL Modem
Dlink DIR-655 Router
Desktop A (Wired Network)
Desktop B (Wired Network)
Laptop (Wireless Network)
If I am downloading a file (1gb) on Desktop A and for some reason I have to stop it, then internet connection is desktop A , desktop B and laptop is almost killed. To get the speed back, I need to reboot Desktop A. All computers are on Windows 7.
If completely download the file, the internet speed is good on all the computers. Before downloading the speed is: After stopping the download the speed is :
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Aug 2, 2012
I'm using Pix 501 with firmware: Version 6.3(3)I have problem with Pix 501:
+ transfer rate data between interface outside and inside very slow, even between 2 interface inside.
+ I have test file transfer between 2 PC connect via interface inside.
+ Results transfer 1 file 1MB with total time 60s
I don't upgrade software current from 6.3(3) to 6.3(5) via TFTP. It's error Please see attach file.
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Aug 14, 2011
I have 2 computers in my room which between them i very frequently share files between. Wirelessly they were both connected to my home's router until recently the router was removed, but will be back soon.The problem though, was that with using the router, file sharing between those computers was slow, and with the router gone, I was lost because there was no movement of data between the computers whatsoever, I had no crossover cable, but plenty of regular ethernet cable. Than I remembered something about gigabit lan not needing crossovers(both of the computers being gigabit) and I connected them, and marveled at the new way to share files. And more by the exponential boost in speed(800kb/s to a grand 12mb/s{though I still think that is slow for gigabit.}). Obviously I've overcome a problem, but that's not where this story ends, it comes with another problem. When the router is reconnected to these computers, will the files still transfer through there new found direct connection? or will it attempt to go through the router, only allowing me to get the speeds I want when one of these computers isn't connected to the router?
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May 5, 2013
I have a RSPAN session configured between a Cisco 3750 and Cisco 2950 switches and I dont see the traffic I am expecting to see on the destination port. I only see broadcast traffic .. HRSP hellos etc. Below is what I have configured on both switches.
3750 (gi1/0/33)----TRUNK------(fa0/47)2950(fa0/4)-----windows server
3750
---------
monitor session 1 source interface gi1/0/18
monitor session 1 destination remote vlan 901
[code].....
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Sep 4, 2012
I have a problem, here are the situation
- 1 Catalyst 3750
- 1 Catalyst 2960
- 4 Finger Print
- 1 HUB
Configuration
- Catalyst 3750
Interface VLAN182
IP Address 10.62.182.254 255.255.255.0
Interface G0/2
Description Finger Print Server
Switchport mode access
[code]....
Here are the problem,If i connect Finger Print Device to port catalyst 2960, some device not sending data to server, but if i connect all Finger Print to HUB and from HUB connect to Catalyst 2960 at port F0/5, All Device(Finger Print) can send data to server...Is there any special configuration in catalyst so all device can direct connect to port catalyst 2960 without HUB?
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Oct 12, 2011
Hardware Software profile;
Laptop - Windows 7
Desktop - Vista Ultimate SP2
Router - Cisco Linksys E3200
Cables - CAT6
I am a sales engineer, so I use my desktop and laptop all the time. When on road, I sync my desktop with my laptop using a program called ViceVersa. This a very good, reliable syncing program that I have been using for over 10 years ( with upgrades ).
The program allows me to sync my desktop and laptop. The program also shows the data transfer rate during the syncing process. The typical data transfer speed is between 5MB/s and 10MB/s with sometimes up to 12MB/s. A typical sync between the computers will take about 3 - 5 minutes at the ~ 10 MB/s transfer rate using ethernet CAT6 cable inteface. At about 11pm last Tuesday,there was a Windows update on both my Vist and Win7 computers. On wednesday, I went to do a typical sync. The system has dramatically slowed to 59KB/s max. This is about 150 times slower than 5-10MB/s that I was used to for so many years. My typical sync was now taking about 2 hours....unacceptable ! I have tried everything to figure out what is going on and how to fix it but nothing has worked.
Then I tried to see what would happen if I disconnected my ethernet cable ( between the router and the laptop only ) and just sync using the wireless network. With that configuration, the transfer rate is ~ 2.5 MB/s which is not great but is much, much better than 59KB/s. I actually do not know what a reasonable wireless transfer rate should be since I never really did it before due to the faster speed of the wired configuration.
This is just a LAN. Only connecting my Desktop to my Laptop via the Cisco router.
How I can get my wired configuration back up to the 5-10MB/s transfer rate that it once was?
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Dec 11, 2011
So I have a really neat computer sitting here, 2500K, P8z68-v, samsung 830 64gb ssd, corsair vengeance 16gb, deskstar hdd, firepro v5800
I have a non-descript trendnet 56K v.92 dial up modem installed to pci slot1 on my mobo.The phone company says they can't get a quicker connection than 31.2 Kbps established to dial up users in this area.The real issue is the data transfer rate.I have seen it reach as high as 6.xx Kbps but generally hovers around 2.5 Kbps.Now it is down to 1.xx Kbps and I took the last 48 hours downloading all the updates for windows and several other updates for hard ware etc.Now I need the ATI firepro update and 114 Mb will take over 16 hours at my average speed, and some 32 hours at the new slower speed
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Feb 14, 2012
You would think that's easily found via Google but that is not the case Our firewall seems to be blocking some file transfers from wireless clients logged into the domain to our Server 03 file server so I need to make an exception but I don't know what port is actually used for that.
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Sep 29, 2011
Netgear Wireless Bridge connects to my long term hotel's wifi, and feeds via ethernet into the Internet port of my WNDR4000.WNDR4000 has my Desktop and WHS connected via gigabit, while the HTPC is 450mbps wireless N with an Intel 6300n, and my Macbook air is connected via 5ghz wireless n as well.I'm having a very bizarre issue where all large file transfers - even over gigabit - are corrupted, while direct downloads are not. I've been pulling my hair out trying to figure out why I CANNOT make a working windows install disc from a tech net iso, and eventually starting checking sha1 hashes. This is how I discovered that direct downloads to machine's hash correctly, but if I transfer it to another machine the sha1 is completely different.
For example, if I download the iso on my macbook air and transfer it to my WHS, the hash is correct on the MAcbook but on the WHS it fails. If I download it to my desktop and transfer it to the HTPC or WHS, same thing happens. There errors are bad enough that Windows setup errors out with a corrupt file error if I make the disc from a networked machine. I have to use the local file to get it to work.
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Jul 15, 2012
I have 2 new 3750g devices in a small environment. switch1 acts as our collapsed core and has ip routing enabled, and is connected to a ASA 5510. There are 3 HP l2 switches connected to switch1 as well. switch2 is simply a server switch. switch1 and switch2 have a 2port etherchannel between them, and a vlan trunk carrying 4 vlan's. traffic between any 2 hosts on switch2 (same vlan) are slow. (average 300Mbits/sec) If I move one of those hosts to switch1, speeds increase by 3 times. (average 900 Mbits/sec). Additionally, traffic between any 2 hosts on switch1 are quick. testing is done with iperf as well as timing 1gig file transfers.
I don't see any errors or drops anywhere, and there are no other symptoms other than slow transfer beteween hosts on switch2. I just got 2 more of these 3750's to put in a 2nd site that we have, put a quick configuration on them, and have the same result. Other than switch1 having ip routing enabled, the configs are pretty much identical.
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Apr 23, 2013
We've installed cisco devices accross our site in the last year or so and slowing getting on top of it now. How ever our old unmanaged kit seems to be out performing it. It's most like down to my misconfiguration which has lead me to here. Below is the details of hardware and configuration between devices. 3750 Core consisting of the following stacked. [code] I've got MRTG monitoring traffic and the throughput seems to max out 24m/s,
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Feb 22, 2011
I recently got a Static IP from my service provider, I'm working from home & configured a FTP server in my PC.
I have to transfer huge files say around 40 GB of data as I'm a Multimedia professional. I was using my web server, before for file transfers but there are lot of limitations to huge transfers.
My client, who is downloading using my Local Server says, it takes 3 mins to download a 9 Mb file, which took 17 sec before, when it was done with the webserver.
Does this have anything to do with my Internet connection speed as my speed is 1 - 2 Mbps. If not is there a possibility to increase my transfer speed ?
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Nov 30, 2012
I have a couple of pc's between which I transfer video files using Wifi, one is a laptop running XP and the other is a media centre which *was* running Windows 7. The laptop is connected to an N router using an ethernet cable to increase speed and because they are located next to each other, and the media center which is on another floor of the house uses a Wifi connection to the router.
The file transfers between the pc's used to run at about 70Mbits/sec which I was happy with. However due to problems with the media centre, I recently downgraded that pc to XP since I get much smoother HD video playback from XP MCE. But... since these changes the transfer speed has now halved to about 35 Mbits! Remember all the pc and network hardware is the same, the only change is to the operating system on the media centre pc.
At first I though maybe the different XP drivers for the network card on the media centre might be rubbish, so I changed the network card altogether, but the speed has remained the same. I have also stripped the networking configurations down to the minimum to reduce overheads, so have removed QOS and unnecessary file and print sharing etc. But none of this has worked. Am I missing something in the XP network configuration that might correct this problem, or is it simply the case that Windows 7 Wifi is just that much improved and faster than XP?
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Nov 21, 2011
I have a WRT54G v6 router and I am trying to get higher speeds from a wireless network, I have set up a dish and a cantenna and is going really well about 18-22dbi gain which is very noticeable but I have a question, does an ?Ethernet cable speeds up the transfers Like the Upload and download speeds will be faster? like a high speed cat7 or cat6 cable that can transfer data at much higher frequencies? I have cat 5 and get around 13Mbps, will cat 6 get me 16 or 17? or the router can't handle it?.Also another question is how can I make the gain on the dish higher?
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Dec 29, 2011
I'm presently experiencing an issue with my Latitude E5410 notebook where the NIC disconnects during large file transfers. For instance, if I were to copy a large file (50+ MB) from a network drive (or vice versa, copy a 50+ MB file from my notebook to the network drive), the network icon in my taskbar suddenly changes to "No Network Access", the transfer fails, and I can't access any network resources until restarting my workstation.
At first I thought it was the network backbone in our office (SonicWALL Gateway + Dell PowerConnect switches), but this error also occurs at my house with my own networking equipment (D-Link) and NAS. The Latitude E5410 notebook is running Window 7 Professional SP1 and has a built-in "Broadcom NetXtreme 57xx Gigabit Controller", and a "Dell DW1501 Wireless-N WLAN Half-Mini Card". However, this issue seems to only occur with the Broadcom adapter when I'm physically connected to our network; when the Broadcom adapter disconnects, I can connect to our local wifi network and access network resources.
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Mar 14, 2011
Linksys WRT54G v5 Router
Arris TM502G/CT Modem
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Apr 26, 2013
Region : Hongkong
Model : TL-WDR4900
Hardware Version : V1
Firmware Version : 3.14.3 Build 130320 Rel.39025n
ISP : PCCW Netvigator
I have upgraded to the latest firmware which solved lots of problems regarding unstable wifi connection as well as BitTorrent / P2P transfers.But I also observed that when my BT is on (Transmission for Mac) at around 50KB/s upload and download, my network latency hikes up from some 30ms to 500ms which affects a lot on web browsing or other apps requiring Internet.My BitTorrent app is showing I am merely making some 20 peers connection so I am not convinced that is an ISP problem but it's more about the router.
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Sep 5, 2011
A customer reported that their router experienced spikes (high cpu utilization) every 4 hours and claims that it is caused by snmp polling of the Ciscoworks server.
The process SNMP engine is the process that causes these spikes .We think that the job responsible of this periodic high CPU utilization. It's called "Vrf Collector Job" and it's runnning every 4 hours.Below the result of show stack PID and show version
*Sep 5 12:02:43.230 GMT+1: %SYS-1-CPURISINGTHRESHOLD: Threshold: Total CPU Utilization(Total/Intr): 56%/14%, Top 3 processes(Pid/Util): 557/39%, 488/1%, 555/0%
*Sep 5 12:02:43.286 GMT+1: %HA_EM-4-LOG: CPUTH:
Process 557: SNMP ENGINE
Stack segment 0x1CFC204C - 0x1CFC4F2C
[code]....
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