Cisco WAN :: 3750x Performance Poor When Both PCs NIC And Switch Port Fixed At 100 / Full
Jun 15, 2011
We have recently purchased some Cisco 3750x switches and we are getting complaints from users that the performance is poor when both the PC's NIC and switch port are fixed at 100/Full?
There are no errors or collisions on the switch interfaces so there is no obvious problem on the switch. The PC's are standard DELL Optiplex 755/760's
or gx 520's.
Any performance issues when configuring the switchport to 100/FULL?
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Jan 1, 2013
I have 2 RV042 routers with identical firmware (1.3.13.02-tm) and settings. One router is a backup that sits in a box, but both experience this problem. The WAN port gives very poor performance most of the time. Download speeds range from normal, 25mb, to less than .5mb. Pings from my command prompt or the routers "Diagnostic" page, even to the cable modem, are almost always above 500ms. However, pings to internal resources are fast, usually under 5ms. If I connect my laptop directly to the cable modem I have no speed issues. The problem occurs whether I use WAN1 or WAN2.
If I restart the router, speeds are fine for a few seconds and then it begins to slow down like someone is turning down a dial. We also regularly experience a complete internet disconnect quite often, and when it happens, the ping results are the same when it comes back up, almost like the router is restarting itself. [code]
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Jun 14, 2012
I'm new here but I'm not really new to networking. I manage small network but I just found out that I have some issues regards to speed.So what's the problemAs a main router/fw we have Fortigate 100A which then goes to a core switch SRW2016.This switch then handles two VLANS.The problem is that I have ports 5 assigned to VLAN 100 and port 6 to VLAN 101. They relate to DMZ1 (VLAN100) or internal (VLAN101).When I connect small unmanageable switch to port 5 I get very low performance (20kB/s internet, 2-3MB/s LAN) however when I plug in PC directly, I'm getting full speed.Port 6 with VLAN101 has the same unamangeable switch but no issues.Obviously you're thinking it's the switch - well I've tried replacing it allready. It's not the switch.Both ports have the same configuration (relating to their VLAN) but resolving it goes beyond my knowledge
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May 1, 2011
having a very strange problem with a Cisco 1861 running - Cisco IOS Software, C1861 Software (C1861-ADVENTERPRISEK9-M), Version 12.4(24)T5
The issue -I have suddenly started to get performance issues with downloads and access through the ZBF. Without the firewall enabled and just having NAT enabled and routing , downloads perform as expected - ( have been using Itunes download as test file ) - with the ZBF enabled , and the necessary rules installed to inspect & allow traffic - downloads stall - and the only way to get the downlaod to start again is to pause , then resume. The stalls are anything between the first 25 - 120 secs.
I have debugged and performed packet traces - but cant see anything untoward. I have also placed another router ( just a cheap Belkin ) on the ADSL service and again , the downloads work as expected.
one further thing to add is that when im tunneling through the firewall ( VPN ) , then downloads do work as expected - suggesting that the issue is with native HTTP(s) traffic.
I have upgraded from T4 to T5 - and the symptons still remain - I am thinking that these may have been introduced when i upgraded to T4 a few monthes ago.
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Nov 30, 2012
I run my virgin broadband through an old NTL modem and a Belkin router. I haveit all attached to a computer in my study along with a new 6TB Buffalo Nas drive. The computer has GIGABIT LAN. I use Belkin powerline units to relay the network around the house. In my lounge i have a blu ray player, AV amp and my sky box attached to the network via the Belkin powerline units and all run ok. This week i have added a Cambridge audio streamer but i am suffering now from a lot of dropouts and network failures escpecially when trying to stream music from my NAS. all seem to be set up correctly as per the manuals. I have spent a lot on this unit specificallly to stream my music so this is really important to get working correctly The powerline units can flash blue (fast ) or orange (slower) but i only see the orange light .My local dealer says i need to upgrade my Modem/Router and has suggested an ASUS RT-N66U which I understand is a modern 2.5/5ghz model . he says my system is overloaded
A few questions.
Is this a suitable modem for me to use on my Virgin cable broadband? (apparently there are two alternatives types of modem/router)
Is there a better alternative unit ?
Could there be another cause for my problems and if so how do i diagnose them ?
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Feb 5, 2012
I replaced a Dir-655 at a coffee shop, with a new dir-655 a few weeks ago. They keep calling and saying that Windows clients are not working and that Mac clients do.My first thought is that they are overloading the router but I would think that all computers would have problems not just the Windows computers. could the router be so bogged down that it takes to long for DHCP request for windows computers assigning the IP twice?
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Nov 13, 2011
We use MS RRAS services behind a Cisco ASA 5520. In testing the performance I have found that we can only get a little over 2MB of througput when connected to the VPN server over a broadband connection. I have verified that the issue is not the RRAS server itself as I can connect to VPN from the LAN and the througput tests at 300-400MB. I also connected to the LAN directly on the outside of the firewall and only get 4 or 5 MB from there which does not seem right. None of the switches are showing any errors. I believe that I have the passthrough stuff setup as I should. I even went through these steps as recommended by Cisco.
hostname(config)# class-map pptp-port
hostname(config-cmap)# match port tcp eq 1723
hostname(config-cmap)# exit
hostname(config)# policy-map pptp_policy
hostname(config-pmap)# class pptp-port
hostname(config-pmap-c)# inspect pptp
hostname(config-pmap-c)# exit
hostname(config)# service-policy pptp_policy interface outside
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Apr 4, 2011
I am using 2 WAP4410N in bridge mode with WPA2 Security.The bridge seems to be stable but i get poor transfer rates.Distance between devices ~ 8m - nothing between.Wireless networkmode: N-Only, Channel: Auto, Channel Bandwitdh: 40MHz (also tried auto and 20MHz)Firmware 2.0.2.1 because got different problems with 2.0.3.3One side is connected to my LAN other is connected to a notebook.
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Apr 3, 2003
I have a Catalyst 4006 with Supervisor II engine. I have 48 port 10/100/1000 blades installed in it for connection to my servers. I am having a lot of problems with performance when connecting servers that are using 100 MB NICs. The speed of the connection is really bad. I have attempted setting the ports and NICs to 100MB Full duplex instead of auto-detect, but still get the same results.
I also have a 10/100 quad-port card installed in a NetApp filer. All four ports are trunked together and connect to 4 ports in the Catalyst. The ports in the Catalyst are trunked using the Port Channel feature of the CatOS. When I look at the port statistics on 3 of the 4 ports from the quad-card, there are a ton of runts and errors (both transmit and receive). The 4th port is fine, no errors.
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Aug 24, 2012
I recently purchased an EA4500. It started out working really well, but recently I noticed that my speed on my iPhone and iPad has dropped significantly. When I'm in my office where the router is set up, I'm getting around 15 to 20 mb download speed and 5+ upload speed. When I go to my living room about 40 feet away my speed drops to 1mb down and less than 1 up. I expect to see a drop in my performance the further away I get from the router, but this seems really unacceptable to me.
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Oct 9, 2012
The wireless connection barely registers in the Speed Test within Cisco Connect - .56 download, 5.35 upload. A cable connection gives 2.4 download and 5.5 upload. The E900 is not far from the computer with no obstacles between.Is the wireless portion of the E900 set up improperly? Is there anything I can do to improve the wireless performance?
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Dec 5, 2011
We have two Cisco AP541N running our wireless network in the office. They're configured with the same SSID, so that people are automatically switched between the two access points depending on their location in the office.
Frequently we are experiencing very poor performance of our wireless connections and it seems to be related to when 4-5 clients are connected to one access point. After restarting it (which also moves the 5 clients to the other access point), the performance problem goes away for a while.
I've upgraded one to firmware version AP541N-K9-2.0(1) (the other is running AP541N-K9-1.8(0)), but it doesn't seem to work.
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May 16, 2013
A few days ago I received my DIR-655 I ordered off Amazon and hooked it up. There were no problems the first day after initial setup. The next day I noticed that I was losing internet connection even though the wifi indicator on my laptop said otherwise. This happens for about 5 minutes at a time and on other devices such as my desktop and my iPad. And I hopped on Call of Duty last night and played a competition with some friends and gave everyone 4bar connection. Later that night, I was playing some more and people that connected to me received 1bar connection and I got that in return on their connection. I feel that the router isn't working with my devices right?
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Jun 2, 2012
I have upgrade firmware of E1500 to latest release to version 1.0.04 and found out bad performance of the router QoS.
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Sep 28, 2012
I have EA4500 acting as a router on domainless all-Windows network of two XP machines.Unfortunately, EA4500 aggressively grabs the role of the Master Browser (I am talking about Computer Browser Service) on the network (regardless in which order you power the devices up) and then doesn't serve as a working Master Browser - both Windows machines stop listing the network computers in the "Network Neighborhood" and incur massive timeouts when attempting to view the listing.A quick look with 'browstat.exe status' reveals that indeed the router has announced itself as a Master Browser device, but returns errors when you query it.Quite predictably, without the router, both machinces figure out amongst each other who will be the Master Browser and everything works fine. The problems begin only when you add the router to the network.
1) Is there any way to make EA4500 work like a full-blown Master Browser (the one that not only announces itself, but also serves as such)? having a Master Browser integrated in "always-on" router would really improve the predictability of the network.
2) If not, is there any way to disable the Master Browser on EA4500? For now I managed to achieve that by assigning the router to different workgroup name, but this is lame, as I now can't connect a disk storage to the router and use it within the same workgroup.
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Dec 6, 2012
We have a remote site connected to ADSL line with a Cisco 887VA router attached. This has been working fine for the last couple of months. However, recently, the site have started to complain of performance issues (network slow, applications disconnecting, etc)Looking on the router, we can see evidence of packet loss/timeouts from a simple ping to the internet e.g. [code]
However, we have logged the fault with our service provider and they return all line tests as clear but what is particularly strange is that they also report “and the SNR Margins are well within threshold levels (Upstream 11.5 and Downstream 15.0)” which, unless I’m misunderstanding something, seems to be completely different from what the router itself is reporting.Is there a reason why the service provider’s stats for Noise Margin would appear to be so different from what the router is reporting?
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Dec 17, 2011
Im getting really poor performance on my 1841, my intial thoughts was a duplex mismatch however although im getting a few CRC errors (root cause unknown at this point) not enough to suggest that the this is the issue.
Heres the config:
Building configuration.Current configuration : 5274 bytesLast configuration change at 20:31:01 PCTime Sun Dec 18 2011 by admin_xversion 15.1no service padservice tcp-keepalives-inservice tcp-keepalives-outservice timestamps debug datetime msec localtime show-timezoneservice timestamps log datetime msec localtime show-timezoneservice password-encryptionservice sequence-numbers!hostname xxxxxx!boot-start-markerboot-end-marker!!security authentication failure rate 10 log
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Oct 14, 2012
if I can use the encrypted port as unencrypted ethernet ports? url.. Each individual port on the Cisco Nexus 5010 switch is numbered, and groups of ports are numbered based on their function. The ports are numbered top to bottom and left to right.There are 20 to 28 ports on the Cisco Nexus 5010 switch, depending on which GEM is installed.
The 20 fixed ports form group 1 and are named 1/port_number. Ports 1 through 16 are unencrypted Ethernet ports. Of these, ports 1 through 8 are 10-Gigabit Ethernet and 1-Gigabit Ethernet-capable ports. Ports 17 through 20 are encryption-capable Ethernet ports.
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Sep 29, 2012
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.
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May 15, 2012
I would like to know if it possible to create a policy map in order to redirect the traffic ( 80 , http, 8080) to a proxy.
My current equipment its a 3750X using a IP Service License ,I was reviewing some options but i want to be sure before implement in production.
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Oct 8, 2012
I want to limit the bandwidth going to remote site on the switch connecting to our netapp.We have a 4 port channel group setup on our 3750x switch going to our netapp storage. We have a Wan 100mb link to our remote site and we want only 60MBs of that link to be used for Netapp traffic all other local traffic needs to use the full amount of the bandwidth to the netapp.
Is possible to allocate bandwidth in this way and how would I go about this? We dont have access to the routers for the link and they plug directly into a port on our cisco.
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Apr 16, 2013
I try to connect 3750X (15.0.1(SE3)) with PC or router that is interface card is fixed to 100Full on 3750X-12S-E I plug a SFP-T, this SFP is ok: [code]
But with Speed and duplex fixed the interface is up arround 1-4s and move to down and errer-disable.
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Jun 19, 2012
I'm trying to get an IP_ADDR set on the management port in SWITCH: mode but for some reason the port seems disabled. PC shows connection unplugged. MGMT_INIT is not a valid command (not listed under '?' ). Bootloader version is 12.2(53R)SE2 FC1.
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Aug 6, 2012
Pure 3750X-48PS ip base stack.One switch reboots from a power issue (possibly the master switch? Haven't confirmed yet in the 3 cases I've seen)The rest of the stack stays running fine (as it should), the rebooted switch rejoins the stack just fine
What I've observed after this scenario takes place is that network throughput on any port in the entire stack is severely degraded. Prior to the one switch rebooting, I can hit gigabit transfer rates going anywhere on any of the switches in the stack. After one member reboots by itself, I typically hit a transfer wall around 5-20mbps in one direction and sometimes better going the other direction. I've only confirmed this on 3750X stacks and I can replicate it every time. Newest code I've experienced it with is 12.2(58)SE1. I have not seen confirmed reports of this on older 3750 (E, G, plain) stacks of which we have a ton of.
Rebooting the entire stack so that all 3750X members are coming up at the same time solves the transfer rate issue every time. I would think there has to be a better way to get performance back to normal or prevent the performance hit in the first place.
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Jan 1, 2013
We have several of the SG300 Serices switches. We use them to route VLAN traffic to Remote Offices, Internet Connections, and WiFi Access Points.In one remote office we have a SG300-10 setup to route the HQ Network and the remote Office Subnet. The SG300 is Connected to HQ via Fiber and has multiple Tagged VLANs on it. If I do speed tests over the Fiber Link on the Incoming Tagged Netwotk I get Decent performance, 80Mbs. If I switch to a networtk that is not priginating from HQ, and have the SG300-10 route packet, I get dismal performance. 15-20Mbs.
I Fireded up a New SG300-28P FW v1.2.7.76. Added a the HQ VLAN 101 and new VLAN 1025 . Mapped some Tagged and untagged ports for each. Switch was connected to HQ Network as untagged VLAN 101. I put a laptop on an Untagged VLAN 101 port. Ran some tests, cam back with 750-850Mbs. Great. Put the same laptop on a Tagged 101 Port, Configured the NIC for Tagged VLAN 101, Same test, same Speeds, 750-850Mbs.I then Configured laptop for Tagged VLAN 1025. Connected to tagged VLAN 1025 port. Ran speed tests, resuts were 15-20Mbs!
I then Configured laptop for Untagged VLAN 1025. Connected to unagged VLAN 1025 port. Ran speed tests, resuts were 15-20Mbs!It was only the Laptop and the Connection to the HQ net on the SG300-28P. Why is the performance of this unit soooooo poor when it needs to route?Other Switches have FW v1.0.0.27 or FW v1.1.2.0. They have Similar speed issues. All Configured for Layer 3.
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Jan 23, 2012
I am having poor performance through an IPSec VPN between two Cisco ASA 5505s. In researching, I found some discussion about setting the MTU for the VPN. So from one side of the VPN tunnel, I tried pinging a host on the other side specifying the Don't Fragment flag and testing different packet sizes. I found that a size of 1398 is the largest packet size that results in a successful ping.So, I also understand that I should be able to set the MTU to 1426 (1398 + 28 bytes for the IP and ICMP headers). What I'm not 100% clear on is where all I need to set this. Do I set the MTU for the outside interface of the ASA that the VPN tunnel is going through, or do I also need to set the MTU for the inside interface, or on the outside interface and the switch port that the interface is connected to (switch port is set to an MTU of 1500 as well)?My thoughts are that only the outside interface of each ASA needs the lower MTU (currently set at the default of 1500).
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Jan 23, 2013
When I read Nexus 5K install guide , I found the follow :The Cisco Nexus 5596UP switch has the following features: # •48 fixed 1- and 10-Gigabit Ethernet server connection ports on the back of the switch AND The 48 fixed ports support 8-, 4-, 2-, or 1-Gbps Fibre Channel transceivers and 1- or 10-Gigabit Ethernet transceivers. Does these is a conflict ?The 48 fixed port on this switch support only 1- and 10-Gigabit Ethernet or 8-, 4-, 2-, or 1-Gbps Fibre Channel and 1- or 10-Gigabit simultaneously ？
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Oct 23, 2011
is it possible to shutdown a specific port on my 3750x and monitor this port at the same time .for example , im dealing with a mac authenticated network using port security , i want to shut down all the ports that are not used at the moment , however , if some one gets connected to the one of the shutdown ports i want to know the mac address of the user or atleast to know that i have someone who is just plugged in to the one of the shutdowned ports .
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Mar 13, 2013
I want to receive full BGP in my switch 6506 with the follow characteristics: cisco WS-C6506-E (R7000) processor (revision 1.2) with 458720K/65536K bytes of memory and Supervisor Engine 720.When I configure the session BGP in my router with me peer the switch begins to work slow and restarts.
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Apr 15, 2012
I am currently connected to my router via a 100 megabit cable (the router port itself is either 100M or 1G, I can't remember). There are no free ports on the router, but I want to connect additional computers to the network. If I get a gigabit switch and connect two of my PCs to it using gigabit cable, can they communicate at gigabit speeds, or will they be limited by the 100M connection back to the router? (In other words, does traffic between two computers on the switch have to be sent through the router, or not?)
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Jun 14, 2012
What is the Cisco 1921 router performance if connected with 2 Giga Ethernet port? What is the performance if enable GRE tunnel ?
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Nov 2, 2011
I would like to know why i can't configure to 100 full duplex one port from target follow: WS-X6724-SFP
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Apr 23, 2012
I have a WS-C3560G-24PS service as a distribution switch with six (6) WS-C2950T-24 connected to it. In looking at the utilization on the inter connect links no one is running close to a gig speed and this includes the link between this switch and the core. The CPU load (6%) and memory utilization (30%) on the switch do not seem bad so what else does one watch to see if it needs an upgrade?
We are starting tohave discussions about any needed upgrades on the network. I have an ocassional user that complaines about low performance but looking through the network I can find nothing glaring on a consistent basis that says an upgrade is warranted. I am however looking at things such as the above. Utilization on links, CPU, memory, etc.
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