Cisco Switching/Routing :: 3560E Receiving A Large Amount Of Output Drops On 4 Interfaces
Dec 6, 2011
We are receiving a large amount of output drops on 4 interfaces that connect to microwave wireless.This is playing up with our Management system. Saw a bug report but that was for 3750, not the IOS version but was a similar issue. [code] The output errors tend to happen at the same time. All ports are trunks however there are other trunks on the switch that are not having these issues. [code]
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Apr 3, 2013
we have two 6509E, as our core switches. Recently I noticed that on some connections I have a high output queue drop rate.
These 4 x 2 interfaces (gigabit) are connected to our blade encolure, consisting of 4 x WS-CBS3120X-S. The utilization of the links is really quite low, when I see the increase of the drops. (~=60Mbps). All the links are fiber (SFP) and the distance between the core switches and the enclosure is about 15-20m.
I am not aware of any service degradation on the part of the servers. No CRCs, collisions etc, on the interfaces, apart from the drops.
The line card is a WS-X6748-SFP, but other interfaces don't seem to be experiencing any problems.
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Jan 12, 2012
I have an 1841 and started to run into an issue which can be resolved but looking to see what you guys prefer to do in this situation. We allow users to connect the laptop via ethernet and wireless to our network at the same time as well as an iPad or any other wireless technology. With that said, for the most part each user has two IP's at any given point. The issue comes in is that I have a large amount of IP exclusions for servers, printers, switches, etc on the exclude list. I am starting to see that the 255 address are not enough to make a long story short. I am also using the 1841 to handle another range for the voice network, which has no isues. What is the best way to fix this issue? Can I run a virtual VLAN off that 1841 for everyone to use and then have the servers, switches, printers, etc on another one? I want to assume no, as both interfaces are used on the back of the 1841 for the two VLANS running now. Or is the only way to handle this with this device to say that as a policy you can only connect assigned company hardware to the network?
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Jan 9, 2012
today I witnessed a cisco n5k that stopped playing fair. For a yet unkown reason several interfaces started to show output errors all begining within the same second. While i instantly thought this would be a wiring issue I began to ask myself what an output error actually means. Google usually brings up output drops, not regular output errors. So what is it and how can a 10G fiber interface even detect that there is a problem without receiving what it was sending?
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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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Aug 2, 2010
I have quite a few 2960's in a manufacturing environment that are experiencing a large number of Total Output Drops. The gigabit uplinks arn't even close to fully subscribed and if I'm lucky they run at a peak of 4 - 5 Mb on a 1Gb uplink. Something really funky is going on. The individual switchports seem to have the total output drops and the uplinks at 1Gb do not have any output drops and never peak above 20Mb over a 3 month span on a 1Gb link.
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Oct 8, 2012
We are seeing some high output drops on our 3560G's and I'm wondering if there is anything I can do to solve this, or should I just be looking at an upgrade.I do not have qos enabled:
do-rs-ah-3560g#show mls qos
QoS is disabled
QoS ip packet dscp rewrite is enabled
I don't have anything special configured apart from some trunk ports, otherwise its mostly defaults.Should I enable qos and tweak the buffering?
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Feb 21, 2012
I have a 3560X that is directly connected to an ASA 5505. I am seeing output drops on the 3560X interface that connects to the ASA. Below are the troubleshooting commands I have ran, but I don't see any indication to what is causing the problem.
3560X
show run int gig 0/24
!
interface GigabitEthernet0/24
[Code]....
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Nov 23, 2012
Have got 2 6500 in VSS. I'm seeing unsual high output drops. IOS Version: advipservicesk9-mz.151-1.SY.bin
Seeing too much output drops on interface ( in millions). When checked buffers ( output pasted below), it also shows enourmous drops.Not too sure, but is this normal or is there something fishy; which needs to be investigated. [code]
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Mar 13, 2012
I have too much output drops in my cisco 7206 VxR NPE G1 router. I'm doing dot1Q on this interface and is connected to switch , i changed the router and IOS but still the error is same . What can be the reason . The interface on switch and router are 1000/Full and i changed the cable also . The traffic only comes about max70Mbps and it is really confusing. [code]
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Nov 29, 2011
I have 2 Cat-6506's that are used for my WiSM's. The only thing in both Chassis is 2 X WiSMs a SUP-7203A and a 6516A line card.The only connection between the rest of the network and these chassis is on port gig 1/2.[code] If I have read other posts correctly all points to the ASIC being overun by that traffic being sent from my WiSMs out to the Network.
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Jan 25, 2013
I've got a recurring them developing across several deployments of Catalyst 3750X series switches, I'm seeing large amount of output drops across multiple ports but there are is no QoS deployed on any of these switches. (standard FiFO). As it happens the ports in question are a member of EtherChannel groups which are connected to ESX Hosts.I've also seen this behaviour also unexplained on another 3750X at a different site, however it's a single port and connects to an Upstream firewall.However in both cases neither switch has any QoS or non-standard configuration, literally a couple of VLAN's and some EtherChannel groups.Here's some output from the case involving the ESX servers.
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Nov 17, 2012
I have seen an error in GRE configured between two routers over WAN. i am monitoring the WAN link and GRe tunnel via WhatsupGold NMS and it reported that Gre tunnel having packet loss sometimes and this time it affects the services and traffic passing over tunnel.sh int t101 shows output drops . is that the problem ? i have read that i have to adjust MTC size but i tried to change the tunnel MTU to 1400 but still sh int t101 shows MTU as 1514 ? What could be the problem of output drops in my tunnel link. [code]
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Apr 25, 2012
I have a Catalyst Switch that is been used as a SAN switch providing ISCSI connection for servers.The total output drops of the interfaces connected to the SAN and some connected to the servers keep increasing.
Example below:
SWESAN1-1#sh interfaces gigabitEthernet 0/1
GigabitEthernet0/1 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is ec44.763c.8f01 (bia ec44.763c.8f01)MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, reliability 255/255, txload 1/255, rxload 5/255Encapsulation ARPA, loopback not setKeepalive set (10 sec)Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTXinput flow-control is off, output flow-control is unsupported ARP type: ARPA, ARP Timeout 04:00:00Last input never, output 00:00:08, output hang neverLast clearing of "show interface" counters 03:25:04Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 78Queueing strategy: fifoOutput queue: 0/40 (size/max)5 minute input rate 22322000 bits/sec, 2171 packets/sec5 minute output rate 5155000 bits/sec, 1487 packets/sec20441503 packets input, 23941254166 bytes, 0 no bufferReceived 0 broadcasts (0 multicasts)0 runts, 0 giants, 0 throttles0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored0 watchdog, 0 multicast, 0 pause input0 input packets with dribble condition detected16323602 packets output, 9608971046 bytes, 0 underruns0 output errors, 0 collisions, 0 interface resets0 babbles, 0 late collision, 0 deferred0 lost carrier, 0 no carrier, 0 PAUSE output0 output buffer failures, 0 output buffers swapped out
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Feb 21, 2013
I have a problem with Total Output Drops, it's increase and decreases on WS-C3750E-48TD-E.
SWCIACTCT05#sh int gi1/0/47 | i Total output drops:
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 6487344
SWCIACTCT05#sh int gi1/0/47 | i Total output drops:
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 6487344
SWCIACTCT05#sh int gi1/0/47 | i Total output drops:
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 6487344
[code]....
I checked and found two registered bug id: CSCtq86186 / CSCso81660.I would like to know what is the best IOS version to update my switch, IOS 15.0.2 SE2 or 12.2.58 SE2, by the way, my environment is very critical (data center) and the version 15.0.2 SE2 is very recent, but its stable ?In both versions the problem are fixed?
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May 19, 2013
i noticed the "output drops" increasing in interface gi 1/0/1 in my switch 2960-S although the utilization of my interface is between 20% and 50 %
SW__A#sh interfaces gigabitEthernet 1/0/1
GigabitEthernet1/0/1 is up, line protocol is up (connected)
MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 93/255, rxload 3/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
[code]....
what is the cause of this issue ?
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Mar 5, 2012
I'm currently trying to diagnose a re-occuring problem with output drops on an uplink interface to a SonicWALL firewall, between 1am - 3am every night we receive alerts that the output drops (discards) counter has incremented.
This time frame happens to be when several network based backups are running so that's probably to blame for the added traffic count but I'm trying to narrow down what's actually dropping the traffic.
The switch hardware is a WS-C3750X-48 running C3750E-UNIVERSALK9-M , 12.2 (55) SE3.
My current thinking is that the output drops are indicative of congestion on the link to the SonicWALL indicating that the SonicWALL unit is incapable of processing the traffic flow fast enough thus causing the congestion and ultimately the output drops on the Gi2/0/48 interface.
According to SonicWALL the unit is rated at 1.5Gbps throughput without UTM services (pure stateful), and no UTM services are enabled.
I've posted a section of the show interface command:
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
[Code].....
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Mar 27, 2012
Our database server is connected on cisco swich 2960G gigabitEthernet 0/38.while showing the interface command the total output drops is a large value..Is there any issue with this value.I think this is one of the reason for slow access of the server.
cisco6#show interfaces gigabitEthernet 0/38
GigabitEthernet0/38 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 58bc.2746.45a6 (bia 58bc.2746.45a6)
[Code].....
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Jul 4, 2012
I've got a recurring them developing across several deployments of Catalyst 3750X series switches, I'm seeing large amount of output drops accross multiple ports but there are is no QoS deployed on any of these switches. (standard FiFO).
As it happens the ports in question are a member of EtherChannel groups which are connected to ESX Hosts.I've also seen this behaviour also unexplained on another 3750X at a different site, however it's a single port and connects to an Upstream firewall.
However in both cases neither switch has any QoS or non-standard configuration, literally a couple of VLAN's and some EtherChannel groups.Here's some output from the case involving the ESX servers:
Port-channel6 is up, line protocol is up (connected)
Hardware is EtherChannel, address is 1cdf.0f82.1607 (bia 1cdf.0f82.1607)
Description: EC to xxxx
MTU 1500 bytes, BW 2000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
[Code]...
How I can attempt to identify what traffic is being dropped?
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May 22, 2012
What is the cause of having a huge number ( 875349) of total output drops on one of my gigabit utp port gi 2/12 which is connected to Cisco 1841 fa0/0 router by mean of cat5e cable.I did change the cable from cat5e to cat 6 and tried to increase hold queue to 4096 and to tweak wrr queue bandwidth
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May 15, 2011
I am seeing Interface output drops that appera to be incorrect. When I do "Show Interface gi1/0/20", I will get interface output drops of "4294961382". But, when I do the same command again it shows "0" drops. Is this a reporting error? I am ruinning c3750-ipservicesk9-mz.122-58.SE.bin on a 3750 stack with 2 switches in the stack. [code]
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Mar 13, 2013
One of my Catalyst 3750 switch have many out drops, I execute "sh mls qos int g2/0/3 statist" command, there are many output drops in queue3 threshold3. [code]
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Feb 11, 2013
I just got a Cisco 2960G 24-port gigabit switch so that our HP servers can have a Gigabit connection to the network. I moved 2 servers to it (HP Proliant DL380's) but they don't actually seem to be able to achieve even close to 1000Gbps. I ran same some LAN bandwidth tests and it was showing only around 200-300 Mbps between all of them. I also ran a network stress test utility, LAN Tornado, and it was showing packet loss as high as 60% when on gigabit, and only .07% when on 100Mbps.
-Both the NIC's and the switch ports are set to 1000/Full
-Currently using Cat5e cabling no more than 25Ft in length (I know Cat6 would be better but Cat5e is supposed to support Gigabit)
-All servers are on the same VLAN
Here are the port statistics when running just a stress test @ 10Mbps that had a 45% packet loss. What's odd though is when I set the servers and switches to 100Mbps, I get less than 1% packet loss.
GigabitEthernet1/0/16 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 203a.07ff.7e90 (bia 203a.07ff.7e90)
MTU 9000 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
[Code].....
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Jan 14, 2013
We're having kind of a problem with our Catalyst 4507r switches. If we do a "show interface" command we're getting a lot of "Total output drops" on some of our interfaces. It seems to be most of the time on the same vlan.I was wondering if it has got something to do with QOS or queue selection As we don't have any QOS markings configured, is it possible that all traffic is using only one of the four tx queue's?
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Jan 10, 2013
I've been fighting what seems to be an increased number of outqueue drops on our core stack and edge switches for the last 3 or 4 weeks.(The core consists of a stack of 5 3750s in 32-gig stack mode. The wkgrp switches are 3560s. all are at 12.2.52) The wkgrp switches are directly connected to users. We use Nortel IP phones with the phone inline with the user PC. auto-neg to 100/full. [code] However I have tried turning off QOS on a couple of workgroup switches (no mls qos, but left individual port configurations the same) but am still seeing drops.Since I have disabled qos on the switches in question (no mls qos) (not the core tho) I am presuming these commands have no affect on the switch operation and therefore cannot be related to the problem. With QOS turned off one would presume that it is general congestion - especially at the user edge where busy PC issues might contribute. So I wanted to see if I could see any instances of packets in the output queues building up.
I wrote some scripts and macros that essentially did a snapshot of 'show int' every 20 seconds or so, and looked for instances of 'Queue: x/' where x was greater than zero.What I found after several days of watching the core stack, and a few of the workgroup switches that are most often displaying the behavior, was that I NEVER saw ANY packets in output queues. I often saw packets in Input queues for VLAN1, once in a great while I would see packets on input queues for fa or Gi interfaces, but NEVER on output queues. [ code] Additionally, when I look (via snmp) at interface utilization on interfaces showing queue drops (both core and wkgroup), they are occurring at ridiculously low utilization levels (as low as 4 to 8%). I've tried to look for microbursts between the core and a wkgroup switch where the core interface was experiencing drops, but haven't seen any (using observer suite). [code] While the queue-drop counts aren't critically high at this point, they are happening more frequently than in the past and I would like to understand what is going on... In most cases, no error counters are incrementing for these interfaces. Is there some mechanism besides congestion that could cause output queue drops?
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May 3, 2011
My setup is as follows:
Linksys E2500 as DHCP client, all default network settings (MTU auto configured to 1500), connected to:
ZTE 831 II ADSL2+ modem in bridged mode
The issue is that whenever any large file is downloaded over HTTP, the download stops after about 4 minutes and never resumes. This results in:
1) HTTP downloads of anything > ~80 MB failing; tried using several browsers and CURL, all with the same results
2) iOS downloads in iTunes timing out
3) YouTube videos stalling every few minutes
Interestingly, Netflix streaming works OK. Perhaps that's because the protocol for Netflix is not a single large download but a bunch of smaller ones, but that's conjecture.
This all occurs over both wireless and wired connections to the E2500.
If I connect my Mac directly to the ZTE modem, I don't have the problem.
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Feb 19, 2012
I have a few 3560E running Ver 12.2(50)se2. Can these boxes be configured to run VRF. I see a "sho IP VRF" option, but I do not see it available when under config t. Do I need to do a IOS upgrade to be able to configure VRF?
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Sep 2, 2010
I upgraded four 3560E, 12.2(44) to 12.2(55)SEThree 3560 works fine, the last one stops after 17-18 seconds with a solid green LED. I cant get into ROMmon, the switch doesn't boot up. its like "dead but still alive"
My TS:
1: Removed all SFPs.
2: Reset PSU and fan modules.
3: Replace PSU and fan modules.
4: Try to get into ROMmon.(pushing mode button and break seq.)
Startup LED:0-1 seconds: SYST: Amber RPS: Amber STAT: Green DUPLEX: Green SPEED: Green
1-17 seconds SYST: Blinking Green RPS: OFF STAT: OFF DUPLEX: OFF SPEED: OFF
18 s--> (only testet up to one hour) SYST: Solid Green RPS: OFF STAT: OFF DUPLEX: OFF SPEED: OFF
A working 3560EStartup LED information. If I compare a working switch with the faulty switch I can see about 18 seconds into bootingSYST change very fast from green to amber and continues with booting,this doesnt happened on the faulty switch (solid green 18 seconds). Pushing MODE button, doesn't get me in to ROMmon, this works for all the other switches.On a normal 3560 it takes around 40 seconds before I get in to ROMmon. With this faulty switch it stops after 18 seconds(solid green) and it doesnt respond.
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Nov 12, 2012
We have two Cisco 3560E layer 3 switches at the core of our network. The switches are configured as an HSRP pair and the clients on our network point to the HSRP address as their default gateway. So if CORE-A dies, then CORE-B will pick up the address and the default route for the clients will continue to be available.We also need to specify a few static routes on the core switch to allow us to get to specific networks. Is there a way to do this so that the routes failover in the same way that the default gateway does?
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Feb 19, 2012
I have a 3560E with 2 vlans that I want to route between. one device with 2 vlans and route between.Interfaces are configured as such:
int g0/11
switchport mode access
switchport access vlan 10
int g0/12
switchport mode access
switchport access vlan 11
[code]...
Laptops on each port with 10.10.10.2 and 10.10.11.2 configured on them. I can ping from 10.10.10.2 to 10.10.11.1, but not to 10.10.11.2.What do I have to configure to be able to get the 2 laptops to talk to each other?
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Apr 18, 2012
I am looking for a PoE switch with Routing capabilities (e.g osfp) something lower end than 3560E.
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Feb 19, 2012
I am trying to find a way using CLI that I can identify the amperage being used by a 6509 chassis. I have looked through all of the sh power and sh env commands and seem to only find the power being used on the DC side (since the output referemces 42V). Ddint know if there was something I was overlooking. To each things from the AC side will take getting an electrician in which is what I was hoping not to have to do.
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Jan 27, 2012
recently a Cisco 3560E switch went down due to a power surge. the switch is getting power but i am only seeing the below message continously. it is keep on rebooting. i try to reset to factory settings/ safe boot nothing worked. is there any way i can bring the switch up or it is hardware failure.Using driver version 1 for media type 2Base ethernet MAC Address: 00:23:33:af:1b:00Xmodem file system is available.The password-recovery mechanism is enabled.Using driver version 1 for media type 2Base ethernet MAC Address: 00:23:33:af:1b:00Xmodem file system is available.The password-recovery mechanism is enabled.
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