Cisco Switching/Routing :: 2960S Packet Loss Is Minimal If A Switch Fails
Apr 11, 2012
I have a Cisco 2960S stack and I'd like to tune the timers so that packet loss is minimal if a switch fails.To simulate a failed switch I have reloaded it while running a continuous ping to a management address on the stack's SVI: [code] As I see the same results when a ping is directed through the single switch (switched), and through the firewall (routed), I'm inclined to think that this is due to the stack failover timers on the Catalyst 2960S.Is it possible to change the stack failover timers (i.e hold down, failover etc), to speed up the failover process?
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Mar 26, 2012
I have a Cisco 2960S stack and I'd like to tune the timers so that packet loss is minimal if a switch fails.
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Oct 26, 2011
I have 2 Exchange 2010 servers and when I enable the DAG and start replication I see both servers NIC cards reach 100% utilization periodically. I normally don't see this on any of my servers but I figure what the heck it'll be really fast in completion. However, when it peaks at 99-100% for short bursts I see packet loss from other systems on the network.
A minute or two into it I start getting alerts of packet drops on the switch these are connected to (catalyst 2960S). It's not across the board but it's enough to wreak other havoc with processes running. I'm curious as to whether this is the 2 servers having a problem or is this switch not up to it?
I believe the last snapshot I took showed most of the active ports on the switch having a 40-50% transmit status when those 2 servers peaked, which didn't make any sense to me. Is there something on the switch triggering other ports to lose packets or is it broadcasting something it shouldn't?
In more detail:-I'm seeing immediate/more packet loss on the network from the 8 or so APC PDU's that are connected to the same switch at 100/half or 100/full (haven't looked into why that is yet some are coming up at half.
-Couple of sql servers were failing over because they could not reach network resources, timeouts exceeding a few seconds. Really just bizarre for just replication files.
Lastly - any way to throttle the throughput on the Exchange replication via powershell or anything?
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May 22, 2013
We have a site were we have a 887 cisco hsiung a GRE tunnel
When pinging anything froom the tunnel source to the tunnel dest on the local lan we get a 50% packet loss
ping
Protocol [ip]:
Target IP address: 10.9.93.22
[Code].....
replicated the setup exatly in our lab and it works 100% with exactly the same config.
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Mar 11, 2013
I have a cisco 3560E switch setup with LACP, when using LACP i receive alot of packet loss / output drops
When a ping from the server behind LACP:
--- google.com ping statistics ---
44 packets transmitted, 39 received, 11% packet loss, time 42990ms
what would cause this packet loss with lacp?
some output from the switch:
Port-channel12 is up, line protocol is up (connected)
Hardware is EtherChannel, address is d0d0.fd58.7390 (bia d0d0.fd58.7390)
Description: LACP-PORT
[Code]....
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Oct 2, 2011
we have a 6509 with ios 12.2.33SXJ
we have 2 WS-X6516-GE-TX, WS-X6516A-GBIC, and a WS-X6748-GE-TX with a WS-F6700-CFC daughtercard
our sup is a WS-SUP720-3B
we are experiencing packet loss for everything connected in the WS-X6748-GE-TX blade, right now we dont have any production device in that blade due to the packet loss we are experiencing.
this switch was running hybrid before it is now running native ios, however I can't recall if we didn't have that packet loss before. do i need to update a firmware of the card or daughtercard (if this is possible, can't say i've done it before).
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Apr 19, 2013
I have two 2960-s switches with GLC-FE-100FX fibre modules in and I am seeing packet loss over the link that is connected to the modules. When the interface is shutdown and brought back up it always comes up in half duplex even thought it is set to full in the config. I've seen other posts where you have to use the command no duplex then full duplex to get it to come up int full duplex. This does appear to work when I do a show int it says its full duplex however I'm stil seeing 20 - 40% packet loss on the link which suggests to me there is still a speed/duplex issue. The device at the other end is a Cisco 7200 which is set to 100Full. If I plug a Cisco 2811 into the fibre link I get zero packet loss which suggests its a problem with the switch.
I have changed the modules and fibre cables which makes no difference. As I stated at the start I have two 2960's both are showing exactly the same issue. Details of the switch are below the SFP are cisco branded:
Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 28 WS-C2960S-24TS-L 12.2(55)SE5 C2960S-UNIVERSALK9-M
interface GigabitEthernet1/0/25
switchport trunk allowed vlan 380,382,384,386
switchport mode trunk
duplex full(code)
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Aug 16, 2012
I have been searching the message boards and wasn't having much luck. I am running some monitoring sessions on my 6509 and on the VLAN I am monitoring, I am experiencing a really large packet loss. If we hook up a laptop to the destination port and run wireshark we are seeing between 80% and 90% packet loss. I dont see the packet loss on the show port command, but I do on the show int vlan command.
The config is as follows:
Session 2
---------
Type : Local Session
Source VLANs :
RX Only : 500
[Code].....
I was doing some reading on Egress vs Ingress and I am wondering if the Egress SPAN replication state could be causing the packet loss that we are seeing or does the ingress & learn command override that?
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Apr 29, 2013
I have a running setup having 2 Cisco 2960s 24 TS switch with Stack configuration. Now I want to add one more same Cisco switch. My questions are:-
1) How can I do this...(Should follow the same process as I did before.
2) Could I do this without impacting the service. i.e. without rebooting the switch.
3) What should be the connection archiecture as of now since there is two switch so it is connected 1 -1 and 2-2. but for 3 switch should we require to change the connectivity.
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Jan 21, 2013
I use the Switch 2960S support PoE and 10 access points cisco.I have one more question:
-- If all 10 access points cisco use copper cable to connect to 2960S, 5 access points use power adapter and 5 access points use power from Switch. How Switch 2960S will provide power for 10 AP or switch 2960S will understand and only provide power for 5 APs?
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Dec 11, 2012
We have a Cat2960-S Series PoE+ currently running 12.2(55) SE5 ios with SW image C2960S-UNIVERSALK9-M.We want to upgrade the ios to the lastest version but found there are 2 version: 12.2(53) SE2 and 15.0(1) SE.Which is the best & suitable for upgrade?
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Apr 18, 2012
I was just curious about something with upgrading a 2960s stack.
To copy the image to the switches in the stack I use: Switch# archive download-sw tftp://x.x.x.x/filename
Does this also set the image as the boot image or do I still need to issue the boot system flash command?
can I just issue this command on the master switch and reload and the new config will be pushed to the rest of the switches?
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Jun 5, 2013
After i have already configured my cisco switch 2960 , i configured my console as the below [code] after i reboot my switch , i found that the switch asked me for username . However i did not configure username , how can i solve this problem , without password reset . I have already configured 15 switch , 100% this problem will be in all switches.
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Jan 20, 2013
I have hybrid network in which I want to configure VLAN on Cisco 2960 S switch. I have unmanged switch where my DHCP server and other servers are connected. Now I created two VLANs on cisco 2960S and they don't talk each other, but as soon as I connect unmanaged switch to 2960S switch, both VLANs start communicating which I don't want. I want to listen server traffic from unmanaged switch from both VLANs but simultaneously I don't want to communication between two VLANs.
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Oct 3, 2012
I have enabled syslog on my Cisco 2960S swtich as shown below -
-logging facility local6
-logging host 10.11.12.122 transport tcp port 514
I have sent the port to TCP since that is what is configured on the SYSLOG server which is a CENTOS 5.8, running rsyslogd.I have tested the rsyslogd locally and it work.However i want to send any and all log messages in the buffer to my syslog server and it is not working.there is no firewall on the CENTOS and the ASA firewall filter is enabled for outgoing traffic.
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Dec 11, 2012
How a 6509 pair handles the loss of the other vss switch, and what happens when the other comes back on ?
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Nov 9, 2012
Unable to access switch from outside the local network. Can get to all routers and PC's
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Sep 21, 2012
I have a problem with extending the LAN on a client site . They are looking to extend the LAN with a 2960S-series switch. Already in place is a 4510 switch which the 2960 is connected to via fibre. The 2 switches are both set up but there is no connectivity as I cant ping between them or anything. The management VLAN on the 2960 shows line up, protocol down, which I believe means the VLAN is enabled but there is a form of physical mismtach on the ports. I have attached the configs of both switches. I feel it might be a problem with GBIC module compatibility. The SFP installed on both ends of the switch are GLC-SX-MMD. On the 4510, the SFP sits in a twingig converter (CVR-X2-SFP) but there is no light on it at all when the cables are plugged in.
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Jun 4, 2012
I have a stack of 2960S (c2960s-universalk9-mz.122-55.SE2.bin) and the master has failed (used to have a priority of 14). The second switch has become master (priority 1) as can be seen below: [code]
If I connect a new blank 2960S (same IOS) through the stack ports, will the master sync its config to the new one without causing problems?As I understand the new blank switch will also have a priority of 1 and will by default be numbered as 1. So if the config is correctly synced and I later on want to make switch 1 the master, I need to set the priority: [code]
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May 9, 2012
I config mdix on port gi1/0/7 as mdix auto IT does not show in running config.Is there any way or command which i can use to verify mdix on port?
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Sep 23, 2012
I have a live 28port Catalyst 2960S switch. By live I mean that there is an essential piece of equipment plugged into this switch that can suffer little to no downtime. Over the course of time the number of devices patched into this location has increased to exceed the 24 ports available and we have had to resort to adding unmanaged switches to fill the need. We have acquired an additional 2960 & stacking modules that I would like to stack together, keeping the existing switch as the master. It is my understanding that the stacking modules are hot-swappable and that this member switch can be added without bringing the master switch down, thus creating zero down time for the financial server that is connected.
The steps I believe that need to be followed are as such: write mem to existing switch and backup to our TFTP serverinstall the stack module in the existing (while powered up) and new (while powered down)place the 2 redundant FlexStack link cables on both switchesthen simply power the member switch on After boot the member switch will get it's OS and configuration from the master and I can begin moving CAT5 cables from the unmanaged switches to the stack.
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Feb 5, 2012
I have a new Cisco 2960 S series switch with a basic configuration that needs to be uplinked or daisy chained to a Cisco 3750 switch. I am not getting any connectivity to the network with either a straight through or crossover cable. the port remains in amber but a 'show interface' indicates that the interface is up. I can manage the switch with a PC patched into any port on the switch with a static IP address. Must be something very simple that I am missing. Outlined below is the configuration.
Refresh_SW1#sh ver
Cisco IOS Software, C2960S Software (C2960S-UNIVERSALK9-M), Version 12.2(55)SE3,
RELEASE SOFTWARE (fc1)
Technical Support: [URL]
[Code].....
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Sep 13, 2012
I wanted to know if there is a way of upgrading the IOS on a stack of 6 - 8 3750's with minimal impact at reload. Is there a way to reload one member at a time?
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Jan 10, 2012
ws-c2960-24tt-L Ethernet switch adding or removing any device from switch cause a loss of connection to all other devices on switch for about 60sec.
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Jul 4, 2012
I am unable to access a series of switches connected together through a management vlan. I receive the message "The server xx.xx.xx.xx at level_15_access requires a username and password." Entering the username and password fails and the same username and password message returns. I am able to ssh into the switch with the username and password that fails trying to access the switch with the browser.
How can I check the username and password for access with the browser?
I am trying to monitor switch performance. Is there a good way to monitor switch performance with the command line interface?
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May 9, 2012
I have a stack of 4 Cisco Switch 3750 (1 x WS-C3750G-24T, 2 x WS-C3750-48P and 1 x WS-C3750V2-48PS) and I want to do an firmware upgrade of this stack. Actually, all the 4 switches are at the firmware version 12.2(50) SE1 "IPBase" and I want to upgrade them to 12.2(55)SE5 IPBase. According to the release notes, all the switches in my stack are supported.
To upgrade the firmware, I use the command "archive download-sw /imageonly /overwrite tftp://IP_Address/c3750-ipbaselmk9-tar.122-55.SE5.tar" The firmware gets uploaded correctly but then I get the error message "There is insufficient space in flash: to install the required image. Clean up some old images, and try again."
When I do a "show flash", I see that the switch has 5650944 bytes free of 15998976 bytes.
How can i upgrade my switches? Is there an error in my command which I use? Do I need to add an other option?
The problem is, the switches are located in a branch office and there is no direct access to them. Everything must be done remotely.
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Oct 9, 2012
I am using Packet Tracer to simulate Cisco networking.As the existing IOS of the 3560 and 2960 switch are in older version which has no new feature in new IOS, how to upgarde the IOS of Cisco switch at Packet Tracer?
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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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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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