Cisco Switches :: Slowdown / Latency On SG 200-26P When Under Heavy IO
Apr 26, 2012
We used the SG 200-26P (firmware 1.1.1.8 ) as our main LAN switch. We have a few other 100Mb switches but our servers and nodes in our cluster are all on this switch. If you log onto a machine on one of the other 100Mb switches and then Remote Desktop to a virtual machine that is running off the SG 200-26P, and then copy say a large file (500Mb) your you will get major delays in the response time. For instance mouse clicks, screen paints, etc. Remote Desktop to a VM is unusable during this time period. This also happens for instance during backups when files are being copied from a machine to a VM.
As mentioned the other switches are 100Mb switches from HP, a bit old. I didn't change much in the setup of the SG 200-26P our of the box. Jumbo frames is disabled, RSTP is enabled, with Flooding for BPDU handling.
My network Infrastructure consists of 2 core switches(cisco 3950, 24 port) and 3 access switches (cisco 2960G, 48port). No distribution layer.Both Core switches are connected to the BVI of a VPN router.PVST is running in all switches. The STP results are all good. We have 3 VLAN's in the LAN an IP routing is enables in the core switch. The network diagram is attached.
The issue we are facing is that , we get intermittent packet drops while pinging towards the access switches, and there is always a higher latency towards these assess switches.These issues are present even with no other users using the LAN. But these issues are not present while pinging towards the GW.
I guess, it is because of this, we have issues the accessing file server in the LAN. How do we go ahead with the troubleshooting. Will upgrading the IOS resolve this.The present version details is..
Recently I bought a new PC to replace an old laptop that I use in my bedroom. However, initially I couldn't pick up my downstairs router signal. So, I bought a new wireless network card and STILL didn't pick up any signal. I then purchased a Netgear WN200RPT and everything seemed to be ok while using that to repeat the signal up into my bedroom. Then, suddenly, it all stopped working. The WN200RPT would, although showing a full internet connection with no yellow ! or red x's, it would never ever load webpages. So, I removed it and put it back in its box. Then, for some unknown reason after a Windows 7 reinstall, my network card started picking up the signal from my home router and had a good speed and signal. This worked fine for a month or two before it started playing up again. It would randomly slow down and stop loading webpages, or completely lose the signal and show a red x, stating that no signals could be found. The strange thing is, all the other PCs in my house connect wirelessly fine, and so did the laptop that was in the same room as this PC. After a system restore, the internet started working again. Then it stopped. Another restore later, it works. Now it's intermittent again.
Three days ago people started complaining that it seemed slow. It's supposed to be 100mbps fully switched, but I'm getting speeds of 2mbps - 12mbps (at most) between two workstations on the same switch (which is just insane). I did happen to notice on a couple of the Mac OS X machines that the send and receive errors are off the charts (50% - 80% error rate)!!! This seems a bit suspicious to me.
I have a DSL line at work that we use to test external services provided to external users on our primary Internet circuit (Citrix, web applications, etc). Because this DSL line is for testing only, we want to lock it down so the only destinations allowed through the firewall are our own IP spaces.
I purchased a WRVS4400N for this purpose, thinking I could use the IP based ACL list to create these restrictions. However, every time I try to create an ACL, the internet slows to a crawl, and many sites don't come up at all. This occurs even if the ACL rule I add is a simple "allow any any" rule similar to the default rules.
Is this a known issue, or am I configuring something incorrectly? Here's an example of a rule I'm using (IP not real):
Action Service Source Interface Source Destination Time Day Allow All Protocol LAN ANY 1.2.3.0/255.255.255.240* Any Time Every Day
I also get the problem with a simple allow from a single IP (mine) to any destination, without any other rules enabled.
implementation of the ACL ruleset on these routers?
We are having issues with our Cisco 2811 when there a lot of traffic on the device. Usually the router is down around 5%-10%. Total traffic might be around 2.0 MB. This is a router we are using at a remote campus. We do HD video conferencing every friday. We have a 10 MB internet connection that has our VPN connection to the main campus on it. While doing these VTC, the totall traffic is about 6 MB. The CPU Utilization then rises to approx 75% cause call issues and loss of sound. With another test with no one using the connection for anything else the utilization went up to 35%. The router has 128 MB Ram in it. Does the router need more RAM or do we need a larger internet pipe.
What is the config.,which I can suggest my Bandwidth provider,so that my heavy files and small files should be downloaded at the same speed?y problem is that my bandwidth limit is 2 M.B.P.S. but I start getting drops as I start downloaded heavy files like 300 M.B. My Bandwidth provider told me that the only solution is that rate-limit will be increased. But it will be of Higher cost. Any configuration is there so that the same can be resolved without increasing Bandwidth.
We have two 3845 routers set up using HSRP at two locations (4 routers total) connecting inside to a pair of ASA 5520 (Active/Passive failover) on each side. These links are used for internet access and they work great under normal operating conditions - they fail over and fail back without issue. How ever, two weeks ago our operations guys started a new data replication procedure going across these links via an IPSec tunnel created between the ASAs. This seems to have created a situation where the IP SLA tracking is not be able to receive the ping back from the upstream router on the originating side. [code]
I have our SIEM set up to notify me whenever the router logs a State change and I got about 10 a day
Wired works normally, and wireless is otherwise stable, except when under heavy load. E.g. if I initiate a large TimeMachine backup over wifi to my NAS, it will fail and the wifi will drop requiring a power cycle.I have tried a similar transfer over ethernet (~1.7Tb) and although the transfer speed wasn't great (~10MBs, likely due to NAS drive bottleneck), it completed without a problem.
If I try copying ~150Gb over wifi, however, it barely lasts 30 minutes without dropping out.Once the wifi drops, it still connects, but nothing works (I am unable to even connect to the web interface using the local IP). Other devices connected already via ethernet or 2.5Ghz still function normally, but the 5Ghz just fails, and if I try initiating a new connection to the 2.5Ghz it doesn't work until I power-cycle the router.As far as overheating goes, I'm not sure it is an environmental issue... I have the router standing upright in an open space so there is good airflow around it.
I buy this model is QOS, I just read a lot of DIR-655 streamengine article, it's hardware-base QOS router, can operate under heavy p2p application, it's why I am here.The wireless Client is ACER AS1810TZ laptop, the wireless card is Intel wifi link 1000, I have already disable power saving option. AS1810TZ worked fine with my old 802.11G router linksys WRT54GS and Buffalo WRH-HP-54G.The dir 655 seems fine when I just surfing web and download some files with IE, but when I check the statistics, I see a lot of wireless error and tx packet/ rx packet dropped, the percent I calculate is about 0.5%, I am wondering if it's normal phenomenal?When I download several bit torrent files With XUNLEI simultaneously, total 6 files, after 3 minutes, lot of session be created, the router slow down the download and finally crashed, wan be reset and wireless connection lost. router can recover after 1 minutes and try to continue the BT download again, but failed again. [code]
I am backing up massive amounts of data to the cloud. Everytime I do this, the wireless performance on my EA4500 seems to degrade to half its throughput. I am using the 2.4 GHz band.
I play an online game, and latency is critical. I usually play at one server, and typically I get around 100ms ping. Today, when I joined the server I noticed my ping is now 40-45ms. My IP has not changed, internet service has not changed, service of server has not changed. It's almost as if the latency *just got better*. I know there are probably a huge number of factors regarding this, but I'm wondering how I could investigate this. Preferably, I'd like to keep my latency at 40ms, but I have no idea how it got there.
I run windows 7 on a Gateway DX4860 desktop and my problem has been occurring for a long time. I casually play games like league of legends and I believe my problem lies within my computer rather than the network itself because my problem is latency spikes where when I start games with 90 ping, it quickly spikes to 300+ ping ~ 5 minutes into the game and then into the thousands making it absolutely unplayable. I have had this problem on 3 different internet providers and the problem still remains; HOWEVER, while hooked directly to my computer with an Ethernet cord, I have ZERO problems. The house I am living at now doesn't allow me to connect directly.
I have reason to be suspicious as to the game's relevance. These spikes are characterized by no packet loss, as measured by pingplotter and winmtr (more specifically, there is packet loss, but I've come to understand that because it does not continue on to subsequent jumps it's not an issue), and latency leaping to between 250 and 600ms across multiple hops, seemingly without pattern or form, for intervals
Here are some summaries of some extended pingplotter sessions. The suspicion that this is not entirely WoW related is recent, so I'm working on seeing if I can get similar results from some other sources.
Over the last couple of weeks I've been noticing high amounts of jitter and latency over my home network. I've come to some conclusions but am not 100% sure if they are correct or not.When one computer on the network opens a web page, loads a video off youtube or downloads something all of the computers on the network have considerably increased latency for a short period.I've tested 3 computers over WiFI watching ping commands and will show some below in a moment. Tested 1 computer using ethernet to connect to the router and its still affected by the issue. Ive also actually used the router to ping an outside source while the ping is increased and this is also affected. This has only been happening for the last 2 weeks.
Heres a list of hardware being used/software and os.
Windows 7 with a Belkin G enabled usb NIC Windows XP with a realtek rtl8139/810x Windows 7 (Friends laptop) Router = Netgear dg834g Settings
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So I've read up on QoS and understand that my router doesnt support it but I still dont understand how 1 person using youtube can affect my network that much. As before 2 weeks ago it did not affect it what so ever, and it didnt in my old house either. So what this means is that browsing is fine on the network, just whenever you try and play a game or anything that requires low latency anyone touching the network means you get massive jitter.
Start PC.Login to Windows.Programs start. (Only Steam and Windows programs, nothing else.)PC runs normally, and starts with low DPC.After several hours of running I check the DPC and it is much higher at a constant rate.After keeping PC on all night I wake up and the DPC is way high in the yellows and reds with audio popping.Restart PC, rinse and repeat all the above.I've turned off every device that would have any confliction with this. (Also I am connected through Ethernet and I am using onboard sound. My mobo is M2N SLI-Deluxe)
I recently built a new computer, this computer is running Windows 7 (64 bit), playing games such as World of Warcraft I get from 250-350 ms Latency, on my old Windows XP built hooked to the same router gets about 80ms stable.
I have one hub router connected to an ISP cloud and then a spoke router connected to the same ISP cloud. There is a dmvpn connection from the spoke to the hub router and i have attempted to do a few tests from the spoke to the hub router.
When i do a ping from the wan interface (tunnel source) of the spoke router to the wan interface (tunnel source) of the hub router i get a return time of about 700ms on the average. However when i ping from the LAN of the spoke to the LAN side of the HUB, my return time increases to 1000ms and sometimes as high as 3000ms. I suspect the hughes modem HN7700 on the wan side of my spoke to be the cause of the problem.
I am wondering what is Latency value for Cisco ASA 5585X and 5555X . I can see on websites that it says "low latency firewall" but I dont see any value.
I have been getting notifications of large packet loss and latency for itnernal traffic going to servers. I have a simple setup of nagios who pings servers and will notify me of large packet loss or complete packet loss. I have implemented this L3 switch a few hours ago, I am currently running a constant ping to my servers, but I am not niticing packet loss right now.This packet loss happened 4 time spans within the last hour of many large packet losses to all my servers within all subnets. It is now stopped.
I am not sure why this would be happening, the predessor of the internal router was just a normal linux box with 3 NICs on it. Nothing crazy going on since the business is closed.
I have an end user who uses the Anyconnect VPN client to connect to our network through an ASA5510. He has a satellite ISP provider and is experiencing latency issues. Since latency issues are inherent with satellite services and since he has no other ISP alternative, any tweaks that may boost performance/reduce latency with his connection. Typcally, he sees slow performance and also network drives being intermittently available on his Windows 7 computer. he also has an internal wireless router at his home when he connects remotely. Performance when connected through a standard cable broadband connection is fine.
When I play games that are downloaded to my PC from Aeria games I run into intermittent latency. It happens every 6 minutes and last for about 4 minutes so for every ten minutes I get to play about 6 minutes. It only happens with Aeria games; all of them.Is this an issue with my connection to the server or is it possible that it is due to security software?
About two days ago my latency to games and when I ping sites such as google I would have about 20-30ms more than usual. But my ping is steady and doesnt fluctuate, so say I would normally have 70ms to a game server I would now get 100 or so. I have tried all the standard things such as as resetting my router but to no avail. Also nobody else is on the connection only me. Normally I would ping google and get a 19-21ms response time and now im getting about 36-38 screenshot below.
we just switched to a DIR-655 from a terrible Rosewill router a few weeks ago. We've been having some problems, and I've been trying desperatly to figure out what exactly is causing them so I can fix it.
Problem: The router will periodically, and seemingly at random, dive into huge latency spikes. As of writing this, I am running a one thousand ping latency run from CMD, and I've watched response times go from 15ms average to 300ms average. The time of day seems irrelevant, as is what anyone on the network is doing. After a fresh restart of the router, everything runs smoothly for about 10 minutes, at which point everything goes ham.
Details: I am using a DIR-655 D-Link router with a Cisco DPC3008 modem provided by Comcast. Router P/N: BIR655ANA....B1 Router S/N: F35F5BC0019A777 Router Firmware: 2.10NA Connection Type: DHCP
I've run the Modem directly into my PC, the connection is perfect. I've hard resetted multiple times, as well as run it with all of the above settings on/off. Updating the firmware does nothing. I've moved the router/modem apart so as not to cause signal interference.
Things I Can Try I want to try running the router with wireless disabled to see if some sort of interference is being caused by the other computers on the network, or if one of them is hogging bandwidth. I want to try running a program that can monitor or analyze each stage of the connection to see where the problem is. I want to downgrade to an earlier firmware.
last weekend i configured HSRP on our default gateway(Cisco 2600) and now i have the problem that the latency is constantly at 3ms and from time to time it goes up to 10 ms. Is that something i should have expected or is there someting wrong with my configuration? The standby ip adresses are the same adresses as the router interfaces had before and the CPU utilization is at 10 % so i do not know what happend here. I atached the config file so if you need further information i will gladly provid it.
I have an asa 5510 that has many(17)ipsec vpn site tunnels on it. One of the tunnels, one running to a c1900isr at the other end, is experiencing 400 to 500ms latency through it. It does appear to be the tunnel only because there is no latency to the internet. I cleared the tunnel group out and readded it to no effect. isp says everything fine. any other known causes for this
We have 22 x AP1602.5 of them show up in the WLC with Controller Association Latency of around 1 minute and 10 seconds.The other 17 all have latency around 10 seconds.
1. What are possibile causes for high value of association latency?
2. Could high-value association latency be an indication of badly working wifi for data traffic?
\We have purchased AP 1041 and WLC 2500 and I am doing a testing on the configuration. It is fine when both AP and WLC are sitting on the same network. However, if I connect the AP to the WLC which is on another network, I found that latency is quite high when PING the gateway. Here is the brief topology.
I try to plug the PC to VLAN 1 and do a PING test to the VLAN 1 interface and it causes some packet loss and high latency. [URL] If I do the debug ip udp on the AP, it seems the result is normal.
I have cisco 2811 at branch and 3845 at Head office. Two link with 256 kbps bandwidthe each. I did as follows: [code]
When link 1 down, traffic change to Tunnel 2. its OK.I want when link1 flaxuate or latency high (more than 60 ms) traffice change to tunnel 2. If link 2 goes high latency automatically change to tunnel 1.
So I am at a bit of a loss here. For the past week or so, I have been getting random spikes of high latency in online games like World of Warcraft/Star Wars: The Old Republic/League of Legends/etc and I have no idea what could be causing it. My ping used to run around 30-80 and lately is has been spiking from 100 to over 700 randomly. I have tried everything I could think of like not using my router, power cycling my modem several times, making sure my drivers are updated, no programs in the background causing it, no firewalls/anti-virus programs causing it, and several other little things like that. I have also called my ISP and they said everything seems to be working fine. And here's another weird thing, according to speedtest.net, my service is running as it should be: [URL]. The server my service is connecting to is in the next town over which is ~15 minutes away so that couldn't be it either.
Here is my system specs:
OS Version: Microsoft Windows 7 Ultimate, 64 bit Processor: Intel(R) Core(TM) i7 CPU 920 @ 2.67GHz, Intel64 Family 6 Model 26 Stepping 4
my latency values are extremely high, sometimes millions(!) of microseconds. THe problem is always solved by disconnecting the 11b/g wireless LAN adapter, or the Intel(R) Gigabit Network connection. However, I can't work without internet.
