Cisco Switches :: What Is Switch Latency For SG302-8P For L2 And L3 Packets
Feb 23, 2012What is the switch latency for a SG302-8P for L2 and L3 packets?
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Cisco Switches :: Slowdown / Latency On SG 200-26P When Under Heavy IO
Apr 26, 2012We 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.
Cisco Switching/Routing :: Switch 4507 Having High Latency / CPU
Aug 19, 2012We 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.
View 1 Replies View RelatedCisco Switching/Routing :: 3950 - High Latency And Packet Drop Towards Access Switches?
Jan 27, 2013My 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
Cisco Switching/Routing :: 3560x High Latency Ping To Switch Itself Show 12ms
Nov 25, 2012i 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?
View 2 Replies View RelatedCisco Switches :: SG300 Is Dropping Packets?
Apr 10, 2012We have a customer who we sent to Cisco to replace some aging Dell switches. They purchased 5 SG300-52’s for 2 different networks. Their production LAN has 2 “live” switches and 1 spare. The 2nd, a development LAN has 1 switch and 1 spare. Their primary production SG300-52 has GE1-8 VLAN’d off as VLAN2 for public IPs. The untrusted (WAN) interfaces of 2 x ASA-5510’s, 1 x ASA-5505, and 2 x RV082 v2’s are connected to GE2-6. GE1 is the uplink to the co-location center’s Cisco switches. GE7 & 8 are spare ports. Each SG and device port is hard coded for 100/Full.
One of the ASA-5510’s and the ASA-5505 maintain a site-to-site VPN (the development LAN used to be in a different facility hence the VPN). Recently the developers have stated the performance is horrible. I noticed ping traffic loss from PCs on the dev side to servers on the production side in the order of 20-30%. I assumed it was a VPN issue so I opened a ticket with Enterprise TAC (all the ASAs and the SGs have either SmartNet or extended support contracts). TAC determined the problem happened even if you ping from inside the ASA to the untrusted side of the other ASA thus eliminating the VPN as the culprit.
The 2nd ASA-5510 has the AIP module and was not even live until this weekend. Turning it up and giving it a basic config returned the same results. #ping x.x.x.x repeat 100 will drop 20-40 packets. I have no security enabled on the SGs and even tried using the spare SG300-52 this weekend in place of their primary with the same result. I’m to the point of returning one of the Dell switches to production, but this cannot be a good sign. I’m also a bit frustrated that I’ve yet to figure out how to get Cisco Enterprise to speak with Cisco Small Business on this. The customer has over $10k invested in Cisco equipment and Cisco isn’t jumping in to figure this out.
The latest rep wants a packet capture from the SG300’s VLAN2 but there are no PCs there to do this with and the manual doesn’t even talk about doing this. How we can do this as well as get the 2 divisions working together to fix this? BTW, the RV082’s exhibit the SAME exact problem. I can ping from ANY device on VLAN2 to any other device and drop packets. Copying a simple 1MB file over the VPN can take minutes where it should take 1 second. I can reproduce this for 24/7.
Cisco Switches :: 300 - VLAN DHCP Packets Not Passing?
Jul 29, 2012I am seeing a problem with our Cisco 300 switches. We use these switches as access switches, with a stacked 3750-G at the core, two 2960-S at the distribution layer, and about 10 300 Series switches at the access layer (10 port and 28 ports, all PoE).
We use Voice VLAN (VLAN 14) for our Mitel phones – there is a DHCP server on the Mitel system. Phones come up, get tagged VLAN 14 (LLDP), Traffic flows (including Broadcast for DHCP etc…). The system works, and has worked for months.
One day, suddenly, I find that all the Mitel phones on a particular access switch are not working. I look on the Mitel system and the lease on DHCP has expired, and the phone is stuck on renewing its DHCP IP address. I run port mirroring on the switch for VLAN 14 to see what is happening. The phones are stuck on DHCP discover, and I see the DHCP Discover broadcast packets on the switch but nothing else, no DHCP offer packets – hence the phone stuck at boot cycle.
I then do a port mirror from another access switch (that is currently working) – I can see the broadcast packets from the Mitel phones on the broken switch, but on this switch I can also see the DHCP offer packets from the Mitel system. I run two port mirrors simultaneous from the two switches (one working, one not) and I can see that the DHCP offer packets are not coming through to the broken switch. Panic ensues – I look at the distribution layer and there is no problem what so ever.
For some strange reason, the Cisco 300 28 port has stopped passing DHCP broadcast packets on a particular VLAN, even though they are being sent. I power cycle the switch – and hey presto, DHCP offer packets are coming through, and the phones get an IP address and boot properly.
Forward a couple of weeks later, and to today. I have another phone that is showing the same symptoms, luckily it is the only phone on this particular Cisco 300 28 port. The same issue is occurring as described above. I gather as much diagnostic information I can then reboot the switch – but still no joy. I then remember that this switch is not directly attached to the distribution layer and instead gets trunked to another Cisco 300 28 port. I give that a reboot and 5 minutes later, DHCP broadcast offers are passing and the phone boots.
I am listing this problem as not just a ‘one off’ now, and is recurring. It has happened to two of my 300 28 port switches.
All Switches running 1.1.2.0. No link to up time – first instance of the problem, switch was up for 14 days – second instance (another switch) uptime of 39 days LLDP is working fine on the switches, as is Voice-VLAN (Port is tagged and broadcasts out DHCP Discover which is seen by other devices throughout network) Nothing in the log file on the access switch Nothing on the Dist/Core regarding STP – Spanning tree set up is fine throughout.
Cisco Switching/Routing :: C6500 Packets Don't Get Hardware Switches
Oct 23, 2011My C6500 is having relatively high CPU (no spikes, but constantly)
I'm under the impression that cef is causing this problem because alot of packets are being processed or send to/from the CPU. [code]
I did a netdr and I can see that the majority of packets going to the CPU are packets for which I have an entry in the CEF table.What can be a reason why those packets don't get hardware switches?I'm running Version 12.2(33)SXH5 - Sup720-10G.
Routers / Switches :: Computer Is Sending Packets But Not Receiving?
Mar 8, 2011Few systems on my LAN stops recieving packets but sending, this happened after i changed my switch, i run xp professional. i have tested cables, NICs,etc.
View 1 Replies View RelatedCisco Switching/Routing :: Forwarding IEEE 802.3 Raw Packets Through 2960G Switch
Dec 5, 2011I have a requirement to monitor downstream data feed from a remote site and feed it to multiple destination devices for recording. The source data will be fed into a port on a Cisco 2960G switch then, using the monitor function, be forwarded to multiple interfaces. This works fine for normal Etherent II traffic. We tried a test using a device that generates IEEE 802.3 Raw packets ('type' field is used as a 'length' field) but found that while the traffic appeared to be accepted by the input port with no errors it was not forwarded to the destination ports, even when using the monitor function. I did try the 'encapsulation replicate' feature with no luck. It does not forward these packets even if I set all the ports into a common VLAN and let the switch just perform a normal switch function (non monitor).
if it is possible to get the IEEE 802.3 raw packets to pass through the switch and if it is, how to or what I need to do to make it work?
Cisco Switching/Routing :: Command To Debug Packets On 3750 Switch
Apr 18, 2012What other command can be used to debug packets on a 3750 switch ?
View 2 Replies View RelatedCisco Switching/Routing :: 3750X Switches Dropping Packets On Uplink Interface?
May 9, 2013We have a remote site that is using 3750X switches as layer 2 switches back to our home site. The uplink port is showing dropped packets but the utilization on the link is never about 10%. We have a 100Mb circuit to this site. Our speed tests and iperf tests are not showing any issues that we can see. However the port is still droping packets. It is not dropping at a high rate but they are dropping.
switch#sh platform port-asic stats drop gi1/1/4
Interface Gi1/1/4 TxQueue Drop Statistics Queue 0 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 1 Weight 0 Frames 52876 Weight 1 Frames 2 Weight 2 Frames 0 Queue 2 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 3 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 1330874 Queue 4 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 5 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 6 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0 Queue 7 Weight 0 Frames 0 Weight 1 Frames 0 Weight 2 Frames 0switch#
Is there a way to capture these dropped packets to see what they are? We do have VOIP phones at the site and are using Qos.
Cisco Switching/Routing :: 3750 Receiving CDP Packets From Switches Not Directly Connected
Jun 27, 2010A specific switch port which happens to be part of a 2 switch 3750 Switch Stack is seeing multiple CDP packets from 3 extra switch port interfaces that are not directly connected. Noteworthy is that the far end devices have the correct CDP entries and I physically confirmed at least two of those connections that lead to the switch "upstream to the culprit switch". Tricky part is that its production so room for maneuvering is limited. At some point I disabled all Ports save for the real uplink and the problem momentarily disappeared. Re-enable the interfaces problem resurfaces. Is there an explanation, technique to eliminate the culprit with minimal disruption?
View 4 Replies View RelatedCisco Infrastructure :: High CPU Usage / Dropped Packets - Switch Blade WS-CBS3120X-S
Jun 25, 2012I have a couple of Switches Blade 3120, working as active-standby model (HSRP) on a new site deployment. There are other 20 sites more or less, working on the same model, without issues. But in this one, we are seeing a high cpu usage. The traffic going through the platform is 600Mbps (on peaks), and in this case we have 40% of CPU usage. Traffic should be close to 3 Gbps. When we tried to send the whole traffic through the platform, active switch began to drop packets on the majority of interfaces.
When we analyze the CPU usage, there is a special process called "HL3U bkgrd proce" always have the most CPU use, but we do not know what concerns. We do not know if it is caused because there are PBRs configured. It should not matter. How I mentioned, there are other sites working fine and have had always the same PBR number.
What is causing the high usage?. Is there a special debug we could to perform to diagnose the issue?. Also, we have seen a high interrupt CPU usage (9% in this case).
bog-sib-INT-rtr-1#show processes cpu sorted 5sec
CPU utilization for five seconds: 30%/9%; one minute: 25%; five minutes: 23%
PID Runtime(ms) Invoked uSecs 5Sec 1Min 5Min TTY Process
[Code].....
Cisco Switching/Routing :: Catalyst 3560 Switch Won't Forward Packets To Or From MAC Address
Aug 9, 2012I have some Ethernet-connected cameras that all have the same Ethernet MAC address FF:FF:FF:0A:0A:0A. They were originally designed to directly connect to a Windows PC, but they can also connect through a simple unmanaged switch.A Catalyst 3560 switch won't forward packets to or from anything with that MAC address, at least not by default. Is there a way to convince the switch to do so?
It was my hope to replace the dedicated connections we have for these cameras with a separate VLAN for each camera, and switch them through our existing switch network. Given that all of the cameras use the same MAC address, putting them on the same network is out of the question, but different VLANs, where the only two devices on each VLAN were the camera and the PC that uses it, would be fine.
The switches run IOS 12.2(55) SE through SE3. I learned the camera MAC address from the PC's ARP table while the camera software runs; it turns out the cameras don't have a full IP stack either and don't even do ICMP.
Cisco Switching/Routing :: X4648-rj45V+E Module Not Forwarding Frames / Packets In 4507E Switch?
Mar 26, 2012I have a problem with x4648-rj45V+E module, which is not forwarding frames/packets in my 4507E switch. I have done the diagnostic and the module test is passed. When i try to ping from one PC to another in the flat network, icmp is not forwarding. Even i cannot see the mac addresses in the mac address-table. But i can ping to my management port in the sup module?
View 12 Replies View RelatedSevere % Dropped Packets On XP Machine When Windows 7 Machine On Network Not Switch
Aug 2, 2011I have a strange error on my home network that I cannot find a solution to.I have an Huawei SmartAX MT882 from TalkTalk acting as a modem connected to a D-Link DSL-G624T acting as a router/switch. Connected to the D-Link I have a Windows 7 Pro machine (64-bit, SP1) and an XP (home i think) machine (sp 2 i think).The SmartAX modem is set up to perform DHCP and DNS relaying and the D-Link has DHCP turned off and DNS relay turned off.The Win7 machine can access the network, get an IP address and access the internet without problems, regardless as to the status of the XP machine.The XP machine can access the network, get an IP address and access the internet with no problems ONLY of the win7 is powered up. When the win7 machine is off, the XP machine seems to drop about 25% of the ping packets between it and the D-Link router and has no internet access (because of this i assume). [code]
View 8 Replies View RelatedHow To Improve Latency And Routing
Feb 22, 2012I 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.
View 1 Replies View RelatedRandom Increases In Latency
Jan 12, 2013I 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.
View 2 Replies View RelatedIntermittent Latency Spikes
Sep 10, 2011I 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.
[code]...
High Latency When Any Bandwidth Is Used?
Aug 14, 2011Over 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.
DPC Latency Increases Over Time
Mar 13, 2012Start 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)
View 8 Replies View RelatedHigher Latency On Windows 7?
Aug 24, 2011I 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.
View 3 Replies View RelatedCIsco Switches :: SF 300-24P Don't Want To Add Another Switch
Mar 16, 2012I have a 300 series switch with VLAN1 untagged, VLAN 15,5,100 tagged. I want say ports 1-12 to use one uplink/trunk and 13-24 to use another uplink. All ports should have the same default VLAN1 and be tagged for 5,15,100. I'm trying to ease the load on two wireless uplinks(one is a Cisco 1242AG and the other is a UBNT PowerBridge.) I don't want to add another switch. Model: SF 300-24P
View 5 Replies View RelatedCisco WAN :: JN7700 - Tunnel Causes Increase In Latency
Feb 19, 2011I 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.
Cisco Firewall :: What Is Latency Value For ASA 5585X And 5555X
Apr 16, 2013I 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.
View 1 Replies View RelatedCisco WAN :: Packet Latency On Catalyst 3560?
Nov 8, 2011I 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.
Cisco VPN :: Remote Access VPN Latency With ASA 5510
Apr 21, 2013I 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.
View 2 Replies View RelatedWay To Play Games Without Intermittent Latency
Jan 26, 2012When 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?
View 13 Replies View RelatedDSL Latency Raised 20-30ms Suddenly?
Jun 25, 2011About 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.
View 4 Replies View RelatedD-Link DIR-655 :: Ridiculously Inconsistent Latency
Dec 23, 2012 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.
Cisco Switches :: VTP And STP On SG300-28 Switch
May 9, 2011I have a question, does the SG300-28 support VTP and STP?. I want to add it to my network's VTP domain so I don't have to manage vlans manually on the SG300-28 and also be able to configure STP to keep my network loop free.
View 2 Replies View RelatedCisco Switches :: SF-302 Switch Connectivity
Jun 12, 2011i found that cisco small business SF302 PoE managed switch connect with the end device (RFID component) would causing packet drop issue.how should i isolate the issue and proper troubleshooting? would it cause by the PoE issue, or the 10/100 base etc.
View 5 Replies View Related