Cisco Switching/Routing :: WS-C2960S Output Drop Values Change Randomly
Oct 19, 2011
I have a stack of 4 Cisco WS-C2960S-48FPS-L switches running c2960s-universalk9-mz.122-58.SE1 code. One of our network monitoring tools is indicating discards on a certain port on the switch. Upon further investigation I am seeing the Total output drops values change in a very odd manner.
The numbers seem to go from 573 to 1146 to 1719 then back down to 573 and it starts the same pattern over: [code]
The port utilization is quite low, the highest I've seen over the past 7 days is 3.5% with a polling period of every 30 seconds using Statseeker. Yet the discards are bouncing all over the place.
I've searched though the bugs for 12.2(58)SE1 and didn't see anything.
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Nov 24, 2012
We are seeing output drops on a C3560 switchport, this port does not have QoS enabled -- application does not need special qos treatment, as long as packets are not droppd, so I suppose all traffic will share the same queue? then how should I read the output of "show platform port-asic stats drop" which indicates that it is queue 3 weight 2 drop? I am wondering what is the best way to fix this? enable mls QoS and increase queue 3 bandwidth share on this interface or just increase the output queue depth?
switch#sh mls qos interface gi0/1
GigabitEthernet0/1
QoS is disabled. When QoS is enabled, following settings will be applied
trust state: not trusted
[Code]......
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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 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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Aug 28, 2012
I have a network that has a pair of 6500 switches on either end, running HSRP. In between each 6500 are two to three ruggedcom switches. They are connected to each other and the 6500's by trunk ports in a straight line. The 6500's see each other as CDP neighbors, and the 6500's can see the rugged- com as LLDP neighbors (ruggedcom only supports LLDP).
The issue is that randomly devices on the ruggedcoms will drop offline and then come back. The problem is that the devices that drop offline are all in the same VLAN, so it appears like a virus - i.e. one device drops off, then multiple. Eventually the HSRP starts flapping between the two 6500s and this causes havoc on the network.I'm almost to the point of taking a laptop and plugging it into one of the ruggedcom's to see traffic, but the issue is that the ruggedcoms are outside in cabinets that laptops shouldnt be exposed to.
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Aug 1, 2012
I have copied status codes from show ip bg command output and its explanation (from Cisco documentation site)., d and h (suppressed, dampened and history). I read somewhere that these are to control flapping routes. But not able to understand it completly.Raised this question in a couple of forums but didnt get a proper reply.The table entry is suppressed.??The table entry is dampened. ??The table entry history. The table entry is validThe table entry is the best entry to use for that network.
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Dec 4, 2012
We have a 100Mbps metro-ethernet link connecting to a remote site. This link is terminating in our 3750-x stack switch.We are getting a LOT of output drop on that interface and our remote IP Phone calls keep going off because of that.I've disabled all kind of QoS, but no luck.
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Apr 16, 2012
I have a WS- C2924C-XL switch that I would like to upgrade the IOS version on. The IOS version in question can only be installled on an 8MB version of this switch, I have tried to confirm the amount of memory present in the device but I am getting conflicting values depending on where I look.The model number would indicate that this device is a 4MB version, therefore not compatable with the upgrade.Running the show version command from the CLI shows Processor having 8192K/1024K bytes of memory.Accessing the switch via the VMS management interface displays a value of 4MB.
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Apr 29, 2012
I've been working on a 3560 that doesn't seem to map dscp values to a new value: mls qos map dscp-mutation ToR1 22 24 to 46
[Code]....
On the router on the other side, I created an acl that matched on dscp 46, but it doesn't match on it. I've tried moving the mutation map to the ingress interface and I've tried setting dscp with a service policy instead of marking COS and using internal dscp. Where is the mutation map supposed to be placed: ingress or egress? Also, I added an entry in the acl on the router to see if I was mapping to dscp 24, and I am:
[Code]....
So it seems like the mutation map is being ignored completely. Any reason why?
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Feb 4, 2010
We have a C4500 with 2 sup V which is showing high CPU values sometimes.When this occures, the switch shows 95-100% for total cpu for a few hours at a time.show proccesses cpu shows process Cat4k Mgmt LoPri with an unusual cpu value of 65% The show platform heath command gave me a high reading for K2FibFC DelFlow which is about 50% at this peak but is normaly around 1%?
what the process K2FibFC DelFlow means and what could be the cause of this peak?
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Mar 20, 2012
I've been having a debate with a colleague about QOS COS values. My colleague says I need to use COS values across layer 2 trunk links between access layer switches and core switches. My argument is if phones are marking packets with DSCP values I don't need to be concerned with Cos.The reason I ask is we're implementing a new phone system, the ip phones will mark RTP traffic wih dscp value EF and Call signaling with DSCP value of CS3. If my understanding is correct I can trust the dscp values of the phones. We are using Cisco 4507 switches which I believe automatically trust dscp values so I would just need a class-map to match the dscp values and apply the output policy map on the egress interfaces as follows? [code]
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Oct 14, 2012
We have a 4500 series switch that is running around 39% cpu utilization but seems to be dragging a bit. I did a show platform health and GalChassisVp-review has a target of 3% but an actual of 17%. All other actual values were at or below target values. I then went to show platform cpu packet statistics and in the "Packets received by Packet Queue" all queue packet values at 5 sec, 1 min, 5 min and 1 hour avg were either 0 or 1 with the exception of Esmp - that averaged 351/377/317 and 313 respectively. I then checked show platform hardware acl input entries static and the entry type InputEsmpToCPU had a whopping 10121370 hit count. All other entry types were well under that number.
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Oct 26, 2011
I'm working on a catalyst c3750 and for my work i need to prioritize certain streams independent of their bandwith usage.
The streams are the following:
- voice
- video
- data
I created policy maps based on vlans like below:
policy-map VOICE
class class-default
set precedence 5
policy-map VIDEO
[Code]...
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Mar 15, 2011
Up until recently (4 months ago) my network was fine. However, all of a sudden the network began to drop randomly. Now, the network drops about every 30 mins. Its quite an inconvenience, especially as there are two laptops, a desktop and 2 games consoles running off of the network (not all at once though). I have a Belkin Wireless G Plus MIMO router.
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Sep 20, 2011
Wireless clients drop off Netgear router - Running a Netgear router in home. Have one desktop PC, 2 printers, 1 Mac and 3 Windows laptop connected. The devices that connect wirelessly will drop of the router in a random way. One printer, an HP all in one, will no longer function and I have to pull the plug to de-energize and restart it. My wireless network is a mess. I have called Netgear and for the first two months they had me change channels and adjust other settings which seemed to work at first but then these symptoms all came back.
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Apr 13, 2011
I just upgraded several of my C2960S-48FPD-L from 12.2(55)SE to 12.2(58)SE and now almost every time I try to SSH to it the switch reboots and gives me these trace backs ...
07:58:52 CST Thu Apr 14 2011: Unexpected exception to CPU vector 200, PC = 1EADA28
-Trace back= 0x1EADA28z 0x1CDC324z 0x1EA5520z 0x1CDC35Cz 0x1CDD0E0z 0x1CDF0C4z 0x1CE06CCz 0x1CE07F8z 0x1D67348z 0x1D611BCz
Writing crash info to flash:/crashinfo_ext/crashinfo_ext_3
07:58:56 CST Thu Apr 14 2011: Unexpected exception to CPU vector 1100, PC = 121BB98
-Trace back= 0x121BB98z 0x12250FCz 0xFA7540z 0xA807B8z 0xA75DF4z 0xA78080z 0x94B708z 0x9717C0z 0x918DD8z 0x936520z 0x9344BCz 0x9345FCz 0x93484Cz 0x1D67348z 0x1D611BCz
=== Flushing messages (07:58:56 CST Thu Apr 14 2011) ===
Buffered messages: (last 4096 bytes only)
0x00000005 R6 = 0x01224F44 R7 = 0x02A23C6C
000089: *Feb 28 18:03:13.577 CST: %PLATFORM-1-CRASHED: R8 = 0x00000080 R9 = 0x00000000 R10 = 0x00000000 R11 = 0x00000071
000090: *Feb 28 18:03:13.577 CST: %PLATFORM-1-CRASHED: R12 = 0x00034855 R13 = 0x00000280 R14 = 0x01CE0778 R15 = 0x00000000
000091: *Feb 28 18:03:13.577 CST: %PLATFORM-1-CRASHED: R16 = 0x00000000 R17 = 0x00000000 R18 = 0x00000000 R19 = 0x00000000
[ code]....
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Dec 9, 2012
I am looking for a reasonable switch but it has do do inter-VLAN Routing. I know I could go with a 3560/3750 with IP Services but I am also thinking the 2960S with IP Base IOS might do?
I have looked up the IP Base IOS and it does list IP Routing but how to actually configure inter-VLAN Routing on a 2960S with IP Base?
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Jan 8, 2013
What are the best values for "mac address-table aging-time" and "arp timeout" by following scenarios?:- single sg300-10 as layer3-switch with a maximum of 10 local (direct connected) hosts - and a 3750x-stack with 100 local hosts + hsrp with a other stack of the same sort or for asa 5520 as internet gateway for 500 clients?I use at the moment a mac aging-time from 300 seconds and a arp timeout from 3600 seconds.
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Apr 19, 2013
I have been trying to enable L3 intervlan routing on C2960S Switch with ip routing command and that was the output from the Switch: [code]
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Jun 2, 2013
I am using 10Gig link to connect distribution and access switches. Since we are terminating the cables at multiple locations, we are also doing the link budgeting. The CISCO SFP 10G-LR module data sheet shows two values for the transmit power one of which is maximum power .5dBm and another is minimum power -8.2 dBm. Which value should I choose for the link budgeting.
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Mar 21, 2012
Is there a CLI-command to see the serial number of the flexstack module installed in a C2960S.
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Jun 13, 2013
We have several of these WS-C2960S-24PS-L running 12.2(55)SE5 C2960S-universalK9-M and need to upgrade to a better.IOS since we have a sitution where CPU would get to 100% but we have only a few ports connected.Also we have several of WS-C3750-48P running 12.2(55) SE6 C3750-IPBASEK9-M.
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May 29, 2011
We have a 2960 stack of 4 WS-C2960S-24PS-L switches.Sometimes, at random, the stack crashes and reboots. I have downloaded the crashinfo file and can see the following error.
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Mar 14, 2013
I'm trying to configure a stack between two WS-C2960S-48FPS-L but does not working.The switch port is always Down.I tried to change de module and cables.I tried to make a loop in one of two switches and the ports always down.
IOS: 12.2(55)SE5
#show switch stack-ports
Switch # Port 1 Port 2
-------- ------ ------
1 Down Down
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Feb 27, 2012
We have two switches WS-C2960S-24TS-L running in stack with running IOS c2960s-universalk9-mz.122-55.SE3.We have connected two checkpoint devices on Gi1/0/24 and Gi2/0/24 with a simple configuration:
interface range GigabitEthernet1/0/24, gi2/0/24
switchport access vlan x
switchport mode access
spanning-tree portfast
On the devices log we get the following message:
%SW_MATM-4-MACFLAP_NOTIF: Host 0000.0000.fe21 in vlan x is flapping between port Gi2/0/24 and port Gi1/0/24
The mac-address 0000.0000.fe21 is not found on any checkpoint interface. "Show mac-address int gi1/0/24 or gi2/0/24" does not show the correct mac-address of the checkpoint interface connected to the port, but instead shows 0000.0000.fe21.Is there a bug in the IOS, something wrong with the switch config or does it have something to do with the checkpoint config?
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Jan 14, 2013
I have a customer with a stack of two switches C2960S-24TS-L that are running 12.2(58)SE2 universal K9, we see that the CPU load increase over time, to 95% and stays there reload solves the problem.the process that akes a lot of CPU is also the SNMP ENGINE, I see that it is running 30 minutes on 95% and then 10 minutes on 35%, this is the only stack were we see this problem. Is there also a SNMP bug in this version ?
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May 10, 2013
Does GLC-GE-100FX is supported on the WS-C2960S-24TD-L. I don't see this switch listed under the compatibility matrix.URL
But the datasheet for the 2960S says this:
"The Cisco Catalyst 2960-S with SFP+ does not support the GLC-FE-100BX, GLC-FE-100FX, or GLC-FE-100LX." But it provides no reference for the GLC-GE-100FX The easy answer is, no the 2960S-24TD doesn't support it, any clarification if possible.
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Mar 29, 2012
is it possible to connect UCS FI directly to C2960S using Twin Ax Cable (3M long) ?
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Dec 12, 2012
I have a very simple setup containing 3 C2960S switches:switch 1: central switch, acting as router between VLAN 1 en VLAN 2switch 2+3: edge switches, connected via 1 link to central switch, both on VLAN 2,Clients connect to switch 2 and 3 using dhcp, switch 1 uses dhcp relay to forward requests from VLAN 2 to the dhcp server on VLAN 1. So far so good.Now I want switch 1 to add option 82 to the dhcp requests so the dhcp server can see whether the request came through switch 2 or switch 3. I tried turning on dhcp option 82 support on switch 1 by doing.
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Apr 1, 2012
WS-C2960S-24PD-LCatalyst 2960S 24 GigE PoE 370W, 2 x 10G SFP+ LAN Base
Can I use the above said switch for 1 Gig Uplinks using SFP.
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Feb 12, 2012
The pinout of poe and poe+ (802.3af) and (803.3at) of these models of Cisco switches?
WS-C2960S-48FPS-L 48 Ethernet 10/100/1000 PoE+ ports; 740W PoE capacityWS-C2960S-48LPS-L 48 Ethernet 10/100/1000 PoE+ ports; 370W PoE capacityWS-C3750-48PS-S 48 Ethernet 10/100 ports with IEEE 802.3af and Cisco prestandard Power
Pin goes where the power for Poe (802.3af) and poe+ (802.3at) for this model Cisco
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Jan 21, 2013
I have three new 2960 switches as listed in the title. I configured them as follows:
192.168.1.215 host: whse-c
192.168.1.216 host: whse-b
192.168.1.217 host: whse-a
Switches B and C flow into A before continuing on into the server room switch (distance issues).All three switches are configured for ports 21-24 at 1000 and set as cisco switches. all other ports are undefined as they have a myriad of desktops, printers and non cisco access points flowing into them. side question - should i configure them as access points where applicable even if they are non cisco? I am replacing three netgear switches that currently are in place and have no known issues other than they are old and the fans may fail soon.hooked up .217. was able to get to it from the network. Hooked up 215 and then 216. All the sudden I lost the ability to tap into the switches, any of them. (I think I had done 215 at that point too, before adding 216. I found out later it took the network to its knees as internet was lost, and the MPLS stopped functioning.
I undid the changes and put the netgears back in service and all was right with the world again. At first I thought it was a bad host name as I had used whse-a on switch C in error. I changed that after this issue.Later that day I put 215 in place. checked it from the network and could get to it just fine. Then I put 216 in service. I lost connection to 215. I could no longer get to the internet from my pc and the MPLS went down again. This time I just unhooked 216. 215 is still in place and working on the network at the moment and not causing issues. (btw these switches are not even in my path from my pc to the internet, just on the same network) tomorrow I am going to try 217 again while 215 is still on the network and see if there are any issues adding that swtich. if I can do so, and there are no problems, is this an indication of a faulty switch? what further testing can I do, have I missed something in setup? If this brings the network down again, why cant i add two of these switches to each other/on the same network path (B and C were not even connected to each other yesterday evening when it went down again).
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Dec 18, 2012
I was looking at WS-C2960S-48FPS-L (740 Watts) and WS-C2960S-48LPS-L (340 Watts) models today, I'm not sure that I understand it right,
Does WS-C2960S-48FPS-L model support all 48 ports POE+ (30Watts)? Does that mean each port will get 30 Watts on this switch?
Does model WS-C2960S-48LPS-L support 24 ports with POE and 24 ports with POE+?.
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