Cisco Switching/Routing :: 3950 - High Latency And Packet Drop Towards Access Switches?
Jan 27, 2013
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..
WS-C2960G-48TC-L 12.2(44)SE6 C2960-LANBASEK9-M
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Aug 19, 2012
We are facing issue of high Latency and slowness with Switch Cisco 4507R at the Customer site.show logging for the Switch and if there is any IOS related issue [BUG] or some other finding for this case.
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Nov 1, 2012
My workstation(10.0.0.250) directly connected to 6509_1 switch. 6509_1 is gateway with ip 10.0.0.5/22. Sometimes routing stop working, but after 3-5 minutes all back to normal.When issue occur i can't ssh to 6509_1, but i connect to second 6509_2 (10.0.0.6) and i can ssh to 6509_1 from it.Then form 6509_1 i try to ping my workstation Wireshark on my workstation show that packet arrive. My workstation reply on it, but switch not accept it.How it possible? As I say after sometime all go back to normal without any changes. [code]
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Feb 25, 2013
I am running (cat4500-ENTSERVICES-M), Version 12.2(53)SG2 on the switch. I have a scenario where I have 3 end user equipments connected to a Cisco 4948 L3 switch. At the switch end port 1/46, 1/47, 1/48 are the terminating points for these 3 devices . I have added these three ports to VLAN140 (switch port access vlan140 on the gig interfaces).
The device connected to 1/46 is the one I'm testing some signalling features on. My requirement is to have intermittent packet drop on this interface so that my signalling associations would go down now and then. I'm trying to simulate a real-time network congestion/latency/packet drop in a simple manner.
I do not want to shut/no shut the 1/46 intf to cause this. Some way to achieve intermittent packet drop on this gig1/46 intf ?
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Nov 27, 2011
In my cisco 3845 router I can see output packet drop in some of the interfaces.I suspect that router is processing packet beyond its mix throughput limit. Moreover when i run show int fax/y switching command I can see packet drop by RP process.
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Nov 25, 2012
i have a cisco 3560x poe. ny currnet version is 12.2(58)SE2.the cpu process is aboute 30% average.my problem is- ping to the switch itself show me 12ms which is high latency.*note- data between two hosts no this has no latency.i realize the packet go into the cpu itself but, the cpu is not loadedusy. so my question is- is this natural behavior?
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Oct 24, 2011
I have an Cisco 6500 CS and there is a Cisco Unified Communication Manger Server connected directly to the Core Switch.I tried to change duplex and speed ( fix and auto ) for both sides, but the same problem.
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Nov 30, 2011
We are seeing the cpu on 2 of our C500 switches running at 99% with the following process causing the issue,.
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Nov 8, 2011
I have installed a Catalyst 3560 as my internal router. I have created 4 vlans to route the traffic.
Here are the interface "show run"
vlan internal allocation policy ascending
!
interface FastEthernet0/1
switchport access vlan 2
switchport mode access
spanning-tree portfast
[code].....
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.
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Apr 8, 2012
we have two 6513 core switches redundant to each other by using HSRP and MST. Currently we have a problem in a CPU as it's high in both cores as appeared in the following logging message:
1: 04/09/12 16:06:20 7/-1: MAJ, GOLD,
test_sp_rp_inband_ping[7]: diag_hit_sp_sys_limit. SP-RP Ping Test skipped. Reason(s): netint_thr_active[1].
[Code].....
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Jun 14, 2011
I just installed a new ISR G2 3925e (spe200 integrated) in a VPN environment it works well but I lost latency (it adds around 8-10 ms in the VPN) because of " IPsec packet batching" :Queues multiple packets at the interrupt service routine level after being processed by crypto engine Reduces interrupt context switching by allowing one crypto interrupt for multiple crypto packetsIt's not very good specaly if you tunnel ToIP and/or video streamsI'm trying to find a solution how to disable it without impact other things or is there something planned soon to improve itfyi I use IOS c3900e-universalk9-mz.SPA.151-4.M.bin
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Aug 14, 2011
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
[code]...
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.
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Feb 21, 2012
I have two 1410 bridges installed in a point to point link using external directional antennas. The distance between the bridges is only 200M. As you can see below from the output the RSSI and SNR are excellent with a good fade margin available. These stats are almost identical to what my path profile calculated out to be. During normal operation the latency on this link sub 2ms, during certain conditions the latency jumps to 40+ms and starts dropping packets. I say certain conditions because we have not been able to pinpoint it. Unfortunately at this time the customer does not have the ability to do any SNMP polling or collect any statistical information (working on getting this setup). There are an excessive number of data retries and am not sure if that is normal. During the issues I have observered the below command output and the numbers did not change, which leads to me believe that it is not a RF issue. It almost looks like it's serialization delay, but I have no data to back that up. During iperf performance testing of this wireless link I could push 54Mbps of UDP traffic no problem, no errors, no CRC's.
Bridge Parameters
Encryption: WPA-PSK w/TKIP
Distance parameter: Configured to 1
[Code].....
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Feb 4, 2013
IXIA----DUT-----IXIA
| | |
|_______ |________|
DUT has redudant connections to IXIA. Im pumping traffic from IXIA and traffic takes PATH A .. When I shut PATH A, i expect traffic to shift to PATH B within 100ms (example). How do I test this ?
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May 22, 2012
I having a basic query in troubleshooting E1 link , here im facing packet drop in the link and we are testing by providing local loop and remote loop from the CSU/DSU at local point and at remote point . I have tried ping test while the loop is given at local point and remote point ie i have pinged my local serial interface IP address (eg 10.0.0.1 -local & 10.0.0.2 -remote ) in Remote Loop i could see no errors and drops and also the traffic on the interface output and input is the same(eg input rate 1000bps and output rate 1000bps) .My query is that when i am pinging the local interface IP does the icmp packet travels till the loop point and comes to the same interface(like a boomerang) .
ICMP packet
->->->->->->->->->->->->->->->
R1 Local CSU/DSU | Remote CSU/DSU (remote loop given )
O-----------O------------------------------O |--------------------------------------O R2
<-<-<-<-<-<-<-<-<-<-<-<-<-<-<-|
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Jan 4, 2012
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
[Code].....
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Sep 7, 2011
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.
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Jan 20, 2011
As of late whenever I, or any of my roommates, browse the internet we have noticed a slower browsing experience, where pages used to load instantly, there is now a noticeable delay in accessing web pages. Also, in playing online video games, whether it be on the PlayStation 3 or PC gaming, high latency is always present. The problem is present whether there is one computer connected, or five, Mac or PC, Wireless a/b/g/n or if connected through the ethernet port. What I ask is: What causes such behavior, and what can I do, if anything, to resolve this issue?
Running a DGL-4500 D-Link Router with Comcast service.
A trace route to google shows the following:
C:UsersAdministrator>tracert www.google.com
Tracing route to www.l.google.com [74.125.224.52]
[Code].....
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Mar 21, 2011
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.
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May 27, 2013
\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.
AP (172.30.40.212) ------- (VLAN 1: 172.30.40.202) switch (VLAN 2: 172.30.41.202) ----------- (172.30.41.210) WLC
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.
*May 28 13:53:36.951: UDP: sent src=172.30.40.212(26610), dst=172.30.41.210(5246), length=1069
*May 28 13:53:36.952: UDP: rcvd src=172.30.41.210(5246), dst=172.30.40.212(26610), length=89
*May 28 13:53:36.953: UDP: sent src=172.30.40.212(26610), dst=172.30.41.210(5246), length=685
*May 28 13:53:36.954: UDP: rcvd src=172.30.41.210(5246), dst=172.30.40.212(26610), length=89
Configuration:
AP 1041 Version: 15.2(2)JB
WLC 2500 version: 7.4.100.0
Both device are configured the static IP address manually with default setting and I do not enable DHCP option 43.
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Apr 4, 2012
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.
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Apr 17, 2012
When using this laptop (Toshiba Satellite C660D-1GD) on the forum it seemed unusually laggy when changing pages, whereas when using my Toshiba Satellite L450D it is always more positive.Decided to do some ping tests via the cmd prompt (after checking the error count via telnet) and they were in the hundreds.The L450D ping tests are spot on so I know it isn't the router (Billion Bipac 7800N)Been the usual route, totally uninstalled the wireless adaptor (Realtek RTL8188CE Wireless LAN 802.11n) including the Cisco elements, Eset and MBAM full scan and downloaded chipset drivers. Even factory reset the router and deleted the wireless profile including reg entries as a last resort.After each of those operations (other than reinstalling the wireless adaptor) the latency would be spot on and continued to be after an immediate reboot, but logging on a couple of hours later or the following morning, they would be very high again.After reinstalling the wireless adaptor for the second time, on a hunch I removed the Ethernet cable and run another test. The latency came in high but when I re-ran the test wired, they were spot on.
Phoned up KnowHow techs and read off the numbers who then put me onto 2nd level tech. He remotely connected and ran a couple of ping -n 50 tests as well as a tracert but was unable to replicate the results I was gettiing. As nothing was broken (for him), nothing to fix but to phone again if it continued.I rebooted after the phone call and got the high latency straight off. I wondered, as the latency returned to normal after certain operations I'd done, whether the remote connection had the same effect.Having been on the phone for 55mins, I'd had enough.These are two tests I've recorded from today which are together in one Wordpad doc, so you'll be able to see what I mean. Ctrl+C has been a bit erratic so they are the only ones I've been able to save. [code]
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Jul 11, 2013
I'm trying to debug a latency / bandwidth issue with 2 servers ( DELL 860 ) connected by infiniband. Servers use 10Gb cards connected on a MTS2400, here are the result for bw and latency: [code]
Are those values 'normal'? I was hoping to get more bw and less latency.I'm using CentOS 6.4 with ib_ipoib driver, it's using stock settings.
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Aug 20, 2011
Im notice after configure the trend micro url filtering on a Cisco 2821 high latency on Http navigation, the latency on the ping for the requests shows a 245ms latency, but if i disable this feature on the router, returns to normal navigation and decrease the latency up to 70ms.
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Sep 30, 2012
I work for a small college. We have several Cisco 1200 Aironet deployed our the campus, all of which are configures to run multiple SSID's. The problem I have is that when I connect, via AP, it successfully connects to the desired SSID but on pinging the default gateway of said SSID I get high latency (avg around 100 - 200ms).When pinging from the switch (Cisco 2950) to the default gateway the latency is good (1-2ms). It is just high when I connect via the C1200 AP and try to ping.
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Oct 23, 2012
I have a 1841 router connected to an ISP (currently SDSL EFM 10Mbps through an ISP modem, the router and the model are connected with a FastEthernet interface). On another location I have a linux server.There is an ipsec tunnel (3des-sha esp) between the router and the linux server (actually done with a crypto mac).The router has a hierarchical QOS policy on the egress interface.When sending traffic from the network inside the router to the linux host without the ipsec tunnel, everything is working fine and throughput is correct.When sending traffic from the inside network to the linux host internal ip through the ipsec tunnel, some packets are lost and the traffic throughput decrease.When sending traffic through the tunnel in the reverse direction (from the linux host to the internal network), everything is fine.I looked at the QOS statistics and the dropped packets counters don't increase. I looked at the egress/ingress interface statistics and no packets dropped there.I lowered the MTU on the egress interface, but it didn't solve the problem. I played by sending various ping icmp packets size, but even small packets are sometimes lost.I tried to check the router CPU, but it seems relatively fine (<= 10%)I captured the traffic on both side, and I see the packets emitted, and then I can see that some of the esp packets of the corresponding side are not received, so it looks like the cisco router is the culprit. This 1841 router is running: 1841 Software (C1841-ADVIPSERVICESK9-M), Version 12.4(24)T4,How can I troubleshoot where and why those packets are lost?
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Mar 9, 2011
I am running ping between two Nexus 7018 over WAN link ,and I can see some set pattern of packet drop(7.40 % drop) with MTU size 1500.When I ping between my 6500 VSS pair and same Nexus 7018 over different SP WAN link on diffrent location , I am still getting same kind of packet drop (8% drop) with MTU 1500. Has any one else come across this issue with Nexus?
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Dec 14, 2011
here's my setup :
office 1 :
rv042 hw3
ISP:Obtain an IP automatically
office 2 :
rv042 hw3
ISP:PPPoE
VPN tunnel between both rv042, everything's fine but when i try to ssh from office 2 to an office 1's server, my connection drops.
When it drops, i can still ping pc in office 1, this is really strange!if i change the office 2 ISP to another provider (obtain an IP automatically) everything's ok !
i try to use another PPPoE ISP for office 2 and it's doing the same thing!I've also tried other rv042 in both locations with the same setup and it's doing the same thing, so it's not a router issue.
i've tried older firmware and it's doing the same thing, so it's not a firmware issue!
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Jan 26, 2013
Recently me and my girlfriend have been having issues with in game latency, receiving pings close to jittering to well over 300 where they were formerly in the 30-40s to identical servers. We live with a Chinese housemate who is extremely conscious of her privacy/personal space, we noticed a dirge of active ports on the router (both TCP and UDP) which seemed to have no association with any major application and assumed it was the old P2P boogie-monster. She is the only one who uses Wifi, an upon briefly deactivating the Wifi, all ping issues were instantly resolved. The bizarre thing is we still have plently of up/download bandwidth, I mean we're not swimming in a fibre optic connection but still a relatively healthy 1MB dl/70KB/s ul, more than enough for gaming.Deciding we needed a better idea of what was going on in the network, we downloaded Wireshark. We discovered a couple of things that might mean something, they might mean nothing at all:Firstly there was a deluge of random ARP requests coming from the suspect IP, something along the lines of:"who has 192.168.0.(random number) Tell (suspect computer's IP)"repeated over and over in bursts. A little googling found us this: Has Your Network been Now given that she is Chinese and is probably exposed to a lot of Chinese websites, is there any chance that this could be the root cause - could it drown the network to the extent that it produces terrible pings?Secondly there have been an inordinate amount of name queries coming from her IP to 192.168.0.255 (broadcast channel), they generally take the form of:
NBNS92Name query NB WPAD<00>
or
NBNS92Name query NB ISATAP<00>
and occasionally, it will name query my network id, leading to: (her ip being 192.168.0.3)
2144211275.734470000192.168.0.3 192.168.0.255NBNS92Name query NB (my id)<20>
2144231275.739314000192.168.0.3 (my id)TCP6658451 > netbios-ssn [SYN] Seq=0 Win=8192 Len=0 MSS=1460 WS=4 SACK_PERM=1
2144251275.741325000192.168.0.3 (my id)NBSS126Session request, to (my network id)<20> from (her network id)<00>
2144271275.744124000192.168.0.3 (my id)SMB213Negotiate Protocol Request
[code]....
Now combine this with the sometimes 9-10 active ports our router assigns to her IP (which don't appear to relate to anything according to numerous port id sites), does this send out a red flag to any of you? I realize it would be so much easier if I could get access to her computer, but as I said, she is very private and timid and doesn't seem to like even having people in her room, let alone letting them use her computer.
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Jul 13, 2012
I have an 887VA-w connected at home. I am using ip virtual-reassembly an all interfaces (dialer and all internal VLANs), I am also using CBAC (currently setting up ZBF). The issue I am having is that I keep getting drop packet error messages and the reasons can differ. Below are some of the outputs I recieve: [code] I have done a show ip virtual-reassembly on all the interfaces and the counter is shown as 0.
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Mar 6, 2013
I have a WRT54G2 router (V1) with the most recent firmware that serves as the gateway between my Internet connection and my home network. Over the past few months, I've noticed that the router seems to consistently become unusable due to high latency when it runs for any period of time. The internet connection is working, but the latency is sometimes as high as 2000ms to ping Google or to run a test from Speedtest.net. When a computer is directly plugged into the cable modem provided by my ISP, the problems resolve.
Restarting the router proivdes a resolution of the problem, but over time the latency issues increase again until it needs to be restarted. Right now, I have it on a mechanical (plug) timer that restarts it every morning around 4AM, but this still doesn't seem to fix the overall issue; I've had to restart the router manually twice today. Before restart, my ping will be over 1000ms; afterward, it will drop back to 20-60ms.Note that the download and upload speeds don't seem to be affected by this, just the latency itself.
The problem appears on both wireless and wired connections.I'm not sure if this is a sign that our router is failing (it was purchased in 2009, so as far as consumer-grade solutions go, it's lasted a pretty decent span), or if there's some misconfiguration on my end, or if something with my ISP is making my router flip out. What can/should I do to fix this issue (please note that flashing the router with DD-WRT is not an option, this version generally sees decreased performance when DD-WRT is installed).EDITED TO ADD: I have ruled out internal traffic causing the problem (I reviewed the log files for the router and tried to identify any unknown stuff, but it seems fine). I can't quite figure out exactly what causes the router to develop the issue, but once it does, I've noticed the following:
Extremely high latency (1000ms+) for pings from any computer inside the network to an outside destination?The router itself cannot ping or traceroute once it has started developing these high latency issues - if you use the router's PING feature, it returns all timeouts.It does not seem to correlate with any specific type of traffic.
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Mar 18, 2012
I have the same issue with Toshiba satellite AA665D-s6091 I expierience crackling sound when playing. peaks appeared when I had either the (cable and wireless) adaptors enabled, when I enable/disable the backlit keyboard and also when I enable/disable eco-mode.A Windows and driver update fixed the cable adaptor issue.
I ran the commands in post #19:
netsh int tcp set global autotuninglevel=disabled
netsh int tcp set global congestionprovider=ctcp
netsh int tcp set global dca=enabled
The wireless adaptor issue was fixed with these, however every time y enable/disable backlit keyboard or eco-mode on my laptop I still get this latency peaks around 18000 us and audio clicks. I check latency with DPC latency checker V1.3.0?
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Mar 10, 2011
Product: Linksys Wireless-G Broadband Router WRT54G
Version: 6
Firmware: Has Been Updated
I am directly connected to my router. Lately, I have been receiving high latency spikes and total loss of internet. The problem must be related to my router, because when I connect to the internet through my modem I don't have this problem.
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