Cisco Switches :: SG200-08 (SLM2008T-EU) IPv4 Packet Loss
May 11, 2011
I recently bought a SG200-08 8-port gigabit switch. The switch firmware is the latest (1.0.0.16). Everything works fine, except that packet loss I have when flood-pinging on the LAN.
I have 3 machines connected to the switch, they have 1000 full duplex links, they all have Ubuntu Linux installed on them, no limiting on the switch (as far as I can tell), no limiting on the machines (nothing like htb, cbq), no QOS set up on the switch, the machines are fairly OK hardware-wise (dual-core, quad-core, six-core). And still, it doesn't matter which way I ping, I get a consistent packet loss of 5-7% when flood pinging:
gimre@voy:~$ sudo ping -n -f 172.16.21.4 -c 10000 -q
PING 172.16.21.4 (172.16.21.4) 56(84) bytes of data.
--- 172.16.21.4 ping statistics ---
10000 packets transmitted, 9247 received, 7% packet loss, time 14944ms
rtt min/avg/max/mdev = 0.036/0.062/0.290/0.035 ms, ipg/ewma 1.494/0.051 ms
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Jan 5, 2012
I've just gotten a SG200-08 (SLM2008T-EU), which I would like to monitor remotely from Cacti using SNMP. It seems however, that this switch has no SNMP support - is this correct? Does this mean that there is no way to monitor traffic over the switch's ports short of making a script access the web UI?
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Aug 28, 2011
We have 2 of the SG200-26 switchs. When ever we loss power all the settings are reset to default. Even if we loss power for 1 min. This includes the IP, user, password, etc. How can I change this so the settings are saved?
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Jan 7, 2013
I have a problem with my SG200-08 Switch the switch not forwarding a special Packet. I try to run a simple Profinet installation for testing on the switch but it didn't work correct. A special packet (Profinet error message) was not forwarded.
I have tried it with different Profinet masters with Siemens Profinet master it works without of problems. With Rexroth master it dosn´t work. But it is the same packet only another Mac Address.
I have added two Wireshark logs, where I have mirrored the slave and the master port. With the Siemens master all packets are forwarding (every packet is double longed) with the Rexroth master the alarm packet was not forwarding (the alarmpacket is lost between the ports).
With a not managed Switch it is no problem too run both Installations correct. I have tried the Factory default Settings of the switch and too deactivate all services of the switch (like Spanning Tree, ..) but it was all the same, the Packet was not forwarded.
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Apr 14, 2013
We have a customer running a Asterisk based Phone system, using Snom 320 phones and a ESW-520-24P as their switch.
Recently we have been confronted with an issue where every 35 seconds their is a very obvious drop of audio for both parties of a call. We know it is not the phone system as we have run tests directly over the BT copper lines that have no drops what so ever. Unfrotunately when we introduce the LAN in any way, we get the drops every 35 seconds.
We are running the whole solution on 1 vlan, yes I know probably better to use two, but the Cisco cannot automatically detect the Snom 320 phones to swap it to another VLAN, which complicates using a VLAN setup.
I really need to work out how to stop these packet drops, but I am new to the world of Cisco and dont really know where to look or what to try.
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Mar 25, 2012
SLM2008T does not have the ability to add Port Description or Login Banner like the SG300's do? I knew there would be some features that the 200 would lack, but I've never seen a smart switch that did not have the capability of labeling the ports via software/web admin. Really makes it easier to keep your head screwed on straight when you are in and out of 14 or more switches during the course of a day.
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May 24, 2011
SG200-08 and SG200-08P fail to hold or update Date/Time.(New installation for a UC320 setup.)I've got both an SG200-08 and SG200-08P that are failing to maintain date/time when set with "Use Local Settings". Every restart/powercycle causes them to reset to Dec 31 1969. Other settings save fine.I first tried to set time via SNTP Unicast using a variety of public time server addresses including the 3 hard coded to the SG200-08 firmware:
Sadly though it always just shows "Active Server Server Host Address: 0.0.0.0" and continues having 12/31/1969 as the date. Both after a config save and a reboot.I can ping the NTP servers just fine from the switches either by IP or by hostname.At this point I've decided that I must be missing something simple. At least I hope so... otherwise it's a firmware bug which means waiting for a fix.Other devices behind the same firewall/gateway (RVS4000) are updating NTP
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Apr 29, 2012
how to connect our new SG200-18 to an existing Cisco network, in particular a C2960S.Here's what I've got:
<----- Rest of network ------- C2960S ----------- SG200 ----- (PC connected directly to the SG200)
On the C2960S-side here's what I've got on the corresponding interface:
interface GigabitEthernet1/0/1
switchport mode trunk
On the SG200-side I've set the IP-address and default-gateway accordingly, however:From the SG200 I can't ping any other host on the same IP-subnet as the switchFrom the SG200 can't ping the default-gatewaycan't ping from any other host or the default-gateway *to* the switch But:On the SG200 I've got plenty of MAC-addresses under "Dynamic Address Table" - however only MAC-addresses that belong to the management-VLAN of the SG200 (i.e. VLAN9 in my case)The MAC-address table on the SG200 even includes the MAC-addresses of hosts on the same VLAN I tried to ping without success. For example: I tried a PING from a host having a MAC-address of 00:19:bb:31:91:30. This MAC shows up in the arp table of the SG200. To cross check I connected a dedicated PC to the SG200 and assign it an IP-address out of the management-LAN-range of the SG200 - in this case I can access the switch (i.e. PING, WEB etc.)So to summarize: Connectivity is OK when going from directly connected devices to the SG200. No connectivity from devices that are behind the C2960S towards the SG200 and vice versa. (The problem is definitely not with the C2960S-side since we've got plenty of them hooked together without problems.) I'm enclosing the screenshots of the corresponding definitions on the SG200.
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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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Jan 1, 2013
i got trouble for this ipv4 & ipv6 fragment trafic prob/attack.how do i prevent it from comming in to my network? is it way to prevent it in cisco router part?
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Dec 12, 2012
i am implementing tcp as per rfc 793, i have one doubt, while sending first packet, if that packet lost means, tcp will wait for RTO and retransmit the first packet, and after got the ack for first packet, then only it will send second packet or without getting the ack for the first packet it will send second packet.
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Apr 18, 2012
My workplace has a UC-540 attached to a cable modem, attached to the world wide web.
When we make VOIP outbound calls through the standard ISP, there is no auditory packet loss sympton; however, when we make calls to out sister branch through our VPN, we experience auditory packet loss symptoms.
I would think the VPN should only be affecting the encapsulation of the data. To my understanding the VPN packets and non-vpn packets all hit the router at the same time, and transport over the web in the same manner. Why would there be packet loss over only the VPN??
--Regarding QoS, if a standard layer 3 device receives a VOIP packet encapsulated in a VPN, do the QoS bits in the VOIP packet get acknowledged, or are they hidden by the VPN encapsulation?
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Mar 29, 2012
My ping is 35ms my DLS at 45.6 Mbps and my Upload is 4.51 Mbps. My Problem is that i am losing about 60 to 90 percent of the packets on a pingtest.net.
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Aug 10, 2011
For about the past 2 or 3 months, I have been experiencing outbound packet loss at about the same time every evening. That timeframe is about 7 PM - 10 PM. This is most noticeable on Teamspeak 3 because of the voice disruption that other users report to me.
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Feb 19, 2013
I have recently switch internet to Time Warner. Since the day I got it, i have experienced random packet losses of 100%. I have called time warner and they are going to send a tech out. But i would like to know more about this before he comes. I have replaced the modem with a brand new one. Surfboard SB5101N from the one i was leasing from them. They both do the same thing. I have made sure all my Drivers are up to date. I have replaced the coax cable and Ethernet cable and ran my Anti Virus and Spyware program. It does it more during online game, I have reinstalled the game and was having no problems with the ATT Dsl i had before this.
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Dec 13, 2012
I'm having an issue with packet loss during the same time every day at 12:20PM. I checked scheduled tasks, ran wireshark, made a static ARP entry, and ran ping tests. The ping tests show packet loss only when pinging 1 DB server to 1 App server. When the packet loss happens everyone on the network connected to the DB gets kicked out of the DB. They are eventually able to reconnect but its annoying that everyday at 12:20pm they get kicked out. Ping tests from the DB to the Firewall stay constant. But when I ping from the App server to the DB it loses connection at 12:20pm and when i'm remoted into the DB server i get kicked out as well. It's like at 12:20pm the DB server stops incoming connections for some reason.
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Feb 12, 2013
When I ping my video streaming host's IP address (the IP that they gave me where I can view my IP web camera's video stream), I get anywhere from 0% to 8% packet loss at various times of the day. They're claiming that there's no problem, that this is because this is a router and it's dropping ping packets due to "ping priority giving preference to more important network traffic."
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Oct 27, 2011
I had all kinds of packet loss and I was ofcourse suspecting my ISP. But then I tested pinging my internal interface and found that it has packet loss as well. I have about 10% packetloss to my interface with 192.168.0.254, I have the same thing from several different inside hosts. My inside rule is the implicit one, any, any. service IP.In the log I can see a teardown and build of the icmp whenever the packet loss accour.There is no packet loss pinging the outside interface from the internet.
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Nov 21, 2011
I am pinging a host from Nexus 7K. I'm losing every 200th packet when I'm pinging the end host. I don't see any issue with network connection.
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Jun 28, 2011
I´m having a problem/issue with my CSM. I have a WS-X6066-SLB-APC - Version 4.2(1), installed on a 6500, and for a while now whenever I ping the VIPs (vservers) I detect some packet loss (In 10.000 ping packets, I loose around 1%), and higher response times; If I ping the reals I see no issues, only with the L3 behind the CSM.
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Mar 3, 2011
3 days ago it worked just fine but not anymore I've run a packet loss test and the result is 100% loss. I don't know why. The internet is really slow, it is unusual. I'm using wireless network. Oh, I'm using windows XP SP3 (laptop) I am not really good at computer and I'm wondering if this problem is caused by virus, malware of something like that.
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Apr 5, 2012
I have a Windows 7 desktop (so it's NOT wireless) that is having problems with packet loss. Now, the modem is fine, I've tested 'pingtest' on some laptops and the packet loss is very minimal. I've tried reinstalling the drivers for the LAN controller, using a different ethernet cable, using the 'winsock' reset command, and I have no luck. This does effect upload times on YouTube, to where a minute long video takes an hour.
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Dec 15, 2011
I started using Windows 7, on two different computers. I get pretty bad lag spikes while using Skype and playing online games. They occur about once per minute and last maybe one second. There is a "Network Throttling" fix floating around the internet which I have tried, to no avail. I don't know much more about computers than a basic understanding, and am completely new to Win7.
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Nov 17, 2012
Pinging 98.137.149.56 and had 100% packet loss; this was suggested in another thread. LAN connected at 100 Mbps BUT cannot access Internet! Windows XP HP desktop; Belkin N Router; Optimum Cablevision - Modem Scientic Atlanta "Webstar"
I am using my iPhone to access Internet.
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Mar 2, 2011
We have a tandberg 6000mxp on a network without QoS. We see packet loss on the tandberg counters and NOT on the network anywhere. A network trace also showed no errors.
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Jan 25, 2013
But I have finally diagnosed the problem. When I try to play games like Combat Arms, Arma II /OA, BF3 and run a ping test on pingtest.net my ping is steady, and my jitter is fine but the packet loss is ridiculous! I will have a packet loss of 90-100% causing the game to be unplayable. But when I run this test playing WoW I have 0% packet loss, steady ping, and good jitter. I am completely lost on what to do, other than contact my useless ISP that will not know what to do. I am really frustrated by this and am not sure what the cause of this is or what to do. I have been researching for over a week and have no where else to turn.
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Nov 2, 2011
In my network i have Cisco nexus 4 switches those are running as redundancy and fault tolerance. I have mulitple VRF instances are running, when i tried to ping the gateway IP (hsrp Virtual IP) witch same VRF instance it is getting packet loss.
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Sep 16, 2011
I am having issues where different laptops are dropping packets when communicating to the WAP on the RV220W. I have placed 3 laptops directly next to the router so there is no chance for walls to interfere. From each machine 1 at a time I perform a continuous ping. Here is a quick output from one of them:
Reply from 192.168.0.1: bytes=32 time=3ms TTL=64
Reply from 192.168.0.1: bytes=32 time=1ms TTL=64
Reply from 192.168.0.1: bytes=32 time=3ms TTL=64
[Code].....
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May 7, 2013
I have two routers, Cisco 3825 and 2811 connected via a p2p ethernet link. The two sides of the links have Huawei muxes with 100/ full duplex set on their interface. I am facing almost 40% packet loss but the supplier is unable to identify any issues at their end. We have tried setting different combinations of duplex and speed settings but no improvement. When set to auto/auto the interfaces are negotiating to half duplex and I am sure this is the cause of the packet loss. Also I heard of auto-negotiation on MUX ports but supplier confirmed no such settings but only 100 Full duplex. If the router iterface is negotiating to half duplex so I suppose there is some thing with the negotition problem with MUX and router port ?
On C3825 I have a Gig interface whileas C2811 has fastEthernet. I guess Gig interface should not negotiate ? Is there a way to pin point the exact fault to supplier ? Also is there work around for this?
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Jun 15, 2011
Internet usage is very slow when initially opening a site from LAN clients. Once established it is OK. If I ping a site from an LAN client by either host name or IP address it takes about 5 seconds, drops the first packet then is fine after that. if I ping it again immediately afterwards it is fine. But if i wait 2 minutes and try again the problem returns. So I would conclude that seeing it is the same whether I use Host name or IP address it is not a DNS issue. Pinging from the router produces no fault at all. [code] I can ping the router internal and external interface or any internal ip or hostname from the LAN with no delay or hesitation so it is not a switch interface or network card problem.Some sort of NAT issue maybe? [Code]
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May 12, 2011
Scenario:
Central Router (WAN: 1.1.1.1) <--> Internet <--> (WAN: Dynamic IP) Branch RouterTunnel 172.31.254.1/26 Tunnel 172.31.254.9/26
Central router is a Cisco 1811 running IOS c181x-advipservicesk9-mz.151-4.M.bin.Branch router is a Cisco 1941 running IOS c1900-universalk9-mz.SPA.151-4.M.bin.
When I do a Ping test directly from the branch to central router over the Internet I have no packet loss:
branch#ping 1.1.1.1 source GigabitEthernet 0/0 repeat 1000Type escape sequence to abort.Sending 1000, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds:Packet sent with a source address of 192.168.0.100!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!(...)!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Success rate is 100 percent (1000/1000), round-trip min/avg/max = 40/41/60 msbranch#
When doing a Ping test over the DMVPN tunnel (which is using the WAN IP as source) I see packetloss.
branch#ping 172.31.254.1 source Tunnel 3 repeat 1000Type escape sequence to abort.Sending 1000, 100-byte ICMP Echos to 172.31.254.1, timeout is 2 seconds:Packet sent with a source address of 172.31.254.9!!!!!!!!!!.!!!!!!!!!!.!.!!!!!!.!!!!!..!!!!!!..!!!!!!!!.!!.!!!!!.!!!!!!!!!!!!.!!!!!.!!!.!!!!!!!!!!!..!!!!.!.!.!!!!!.!!!!!!!!!.!..!!!.!.!!!!!.(...)!!!!!!.!!!.!!!!.!!!!.!.!!.!!!!!!!!!!!!!!!.!!.!!!!!!!!!.!!!.!!.!.!!!!!...!!!!!!!!!!..!!!!!!Success rate is 79 percent (795/1000), round-trip min/avg/max = 40/43/568 msbranch#
Central:
interface Tunnel0 description Testing (DMVPN) bandwidth 10000 ip address 172.31.254.1 255.255.255.192 no ip redirects ip mtu 1400 ip nhrp authentication testing ip nhrp map multicast dynamic ip nhrp network-id 1 ip nhrp holdtime 600 ip nhrp redirect ip tcp adjust-mss 1360 no ip split-horizon eigrp 1 tunnel source FastEthernet1 tunnel mode gre multipoint tunnel key 100003 tunnel bandwidth transmit 10000 tunnel bandwidth receive 10000 tunnel protection ipsec profile secure_profile shared
Branch:
interface Tunnel3 description Testing (DMVPN) bandwidth 2000 ip address 172.31.254.9 255.255.255.192 no ip redirects ip mtu 1400 ip nhrp authentication testing ip nhrp map multicast 1.1.1.1 ip nhrp map 172.31.254.1 1.1.1.1 ip nhrp network-id 1 ip nhrp holdtime 300 ip nhrp nhs 172.31.254.1 ip nhrp shortcut ip nhrp redirect ip tcp adjust-mss 1360 no ip split-horizon eigrp 1 delay 1000 tunnel source GigabitEthernet0/0 tunnel mode gre multipoint tunnel key 100003 tunnel bandwidth transmit 2000 tunnel bandwidth receive 2000 tunnel protection ipsec profile secure_profile shared
Crypto parameters on both central and branch routers:
crypto isakmp policy 1 authentication pre-share
crypto ipsec transform-set secure_transform-set esp-3des esp-sha-hmac mode transport
crypto ipsec profile secure_profile set transform-set secure_transform-set
I disabled CEF on both the central and branch routers and no success. The EIGRP neighborship appears to be stable.
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Mar 18, 2012
my local network another pc packet loss
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Nov 28, 2012
I've been having an unusual networking issue lately, where everything runs smoothly apart from when one user's laptop is connected to the WLAN. All users on the network get something between 20% and 60% packet loss, only when this user's laptop is connected. I've made sure all the TCP/IP settings are reset to default, I've reset the router to factory settings, but the problem persists. This only came on recently, and I don't believe anything changed.
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