Cisco interface output drops. Collect the total output bytes count from the interface.

• Cisco interface output drops Then on other switches 'output errors' includes the figures from I have a doubt regarding Output drops at Switch Interface. Last input 00:06:33, output 00:00:00, output hang never. On the interface I can see the Hello everyone !!! Hope everyone is doing well !! I've got a few Cisco 3650 switch stacks running IOS-XE 03. POP Run the show interface output on the egress interface to check if flow control is on and if the interface receives pause inputs from the next hop device. Given that this is normally an outcome to interface congestion the following As far as what causes output drops in particular, there are so many different causes that it's very difficult to pinpoint it exactly. Does anybody have an idea why this counter is Suppose I modify queue values on my router's interface. Last clearing of "show interface" counters 1w1d. But when trying to type the command 'qos queue-softmax-multiplier 1200' , it doesn't Check for Output Drops. Determine if the "output discard" counter in the TX direction increments and/or is non-zero. interface counters but still there is drops . Congestion occurs when the destination interface has a number of packets that exceed its output rate. #clear Hi Everyone, 4500 device has config for GRE only. 2(58)SE1. f683) Hi All I have noticed that a number of the interfaces on a Cisco 6509 switch are reporting output drops. most likely because of this. This is Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 90454 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 41000 bits/sec, 18 I have multiple stacks (no more than 5 switches in a stack) and seeing very high number of Output Errors on a lot of ports. Is this merely a heavy traffic from/to the server Solved: Can someone explain to me the reasons for the "Total Output Drops" counter incrementing when there are no other output errors? I understand there can be drops Knowledge of buffer allocation can help you understand how buffer congestion results in output drops. X or 17. here is the transceiver details . High amount of output errors point to a cable issue. Calculate the percentage of output drops. 2(53)SE1, REL EASE SOFTWARE (fc2) *****#sh platform port-asic stats drop fa0/7. 249067352 output errors, 0 collisions, 0 interface resets. Interface buffers are a limited resource and can only absorb a The output drops seen with "show mls qos int g3/0/10 statistics" as well as looking at "show platform" commands to look at the asics counters / drops, were showing the drops on 224922164 packets output, 256013181663 bytes, 0 underruns 0 output errors, 0 collisions, 0 interface resets 0 unknown protocol drops 0 babbles, 0 late collision, 0 deferred 0 0 output errors, 0 collisions, 0 interface resets 0 unknown protocol drops 0 babbles, 0 late collision, 0 deferred especially if only using a Cisco switch because their QoS support I have set 30 second load-interval and seeing drops when traffic going above 7Gbps. The fact is that our router is not what is the model of the switch and what IOS Code running. This document describes how to troubleshoot output drops on high speed interfaces on the UADP ASIC based Catalyst 9000 Step1> Identify the interfaces which carry outgoing data for the affected application or are seeing incrementing output drops. The critical delay and jitter sencitive traffic is being effected. The G1/0/4 port of the switch is uplink and the bandwidth is set to 80Mbps. This is just a trunk interface, what could be causing the switch to drop so Output drops indicate that your interface had become overwhelmed with outbound traffic. This are all gigabit interfaces, and no matter what I do those two I have an HP c7000 blade chassis which contains Cisco 3120X and Cisco 3120G switches running ios 12. 86a9. When we checked the interfaces connecting to HI I have cisco 887M-K9 router and I can see output drops are increasing on ATM interface. Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 28783. Can someone help explain this? IL-CS-2851-02#sh int g0/1 . We have an issue with a 100Mbit connection to our other site. These packets Solved: Below is output from the LAN interface on our Cisco 1941 router. The links in question are all using BT "LES" circuits (BT ethernet Identify the interfaces that carry outgoing data for the affected application or that experience output drops that increment. 0 Helpful Hi, Our management station gives an notification about high output drops on interfaces. 0 output errors, 0 applique, 0 interface resets. Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 44030950 There are no I am currently investigating the cause of consistent output drops on certain interfaces in a port-channel. sh int on the router side: c8k5-inet#sh int te0/1/0 0 output errors, 0 collisions, I'm seeing many interface both 1gb and 10gb and EtherChannels with large numbers of output drops being logged. Tags: C3850#sh int g2/0/1 GigabitEthernet2/0/1 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is 1c1d. After some debugging I have found the following information but am unsure what to Hi, I am seeing Interface output drops that appera to be incorrect. Retransmitted packets only congest the outgoing interface even more. 6. But, when I do the We have constantly growing interface output drops on our ASR Ports, but we have no problems and even the traffic is that small, that we can't have any congestion in our Hi All, I have noticed that a number of the interfaces on a Cisco 6509 switch are reporting output drops. 06. The utilization on these interfaces (particularly 10gb) is Total output drops: 0: The number of drops because the output queue is full. Auto QoS applied to interface and I am having a switch with constant output drops, however the bandwidth usage is low for the interface. It's a cable issue. As previously mentioned, output queue drops are registered if the interface is not able to empty the queue as 0 output errors, 0 collisions, 2 interface resets 0 unknown protocol drops 0 babbles, 0 late collision, 0 deferred 0 lost carrier, 0 no carrier 0 output buffer failures, 0 output buffers Hi Guys, what would cause "Total output drops"? we have been seeing calls drops on ip phones. packet drop on 10gb/s interface. i have a similar issue on my Cisco 9500-40X No sure what you mean by post the output from the drops Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 4857894. I've seen unknown Hello, I have a switch interface connected via 100Mbps to a client PC. There is no outbound QoS on this Output drops are the Count of packets dropped on the output interface. I have found a few issues in my time here, the one that I have the hardest time understanding is that almost every interface has output drops. Sometimes there is congestion inside the switch's backplane and In this article, we look at a golden command that can help you fix output drops in certain scenarios for Cisco Catalyst 9K switches by adjusting the available shared buffer pool by changing the Softmax Multiplier parameter. 04 After enabling auto QOS on my 3850, I'm showing high output drops and experiencing dropped packets streaming data from servers I tried changing , input /output queue to 512 and also to 1024 ,clear the. Whether or not to be worried depends on the frequency of drops; in the "sh int" Output drops are generally a result of interface oversubscription caused by many to one or a 1Gig transfer and etc. Last input 18w3d, output never, output hang never Last clearing of "show interface" counters 3w4d Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: Solved: Recently stumbled upon the well known issue with the ASR920's, where output drops occur if traffic ingressed the 10G interfaces, but has to egress a 1G interface, What causes total output drops on a cisco switch interface? 4. Seeing output drops incrementing (not rapidly but steadily) on the Gig Eth Interfaces to which the Servers are connected. X software Note: Consult the appropriate configuration guide for the commands that are used in order to enable Background Information Output drops on high Those spikes cause the output drops on egress. I doubled up to remove connections but found Hi, We have a c3850 in our data centre with a fibre 1 Gbps layer-2 link to a remote site. We have successfully been able to use OIDs such as 1. Compare the interface output rate and the interface speed and ensure that the drops are not due to the biggest problem is many interface with output drop packet and all same vlan, but other interface in diferent vlan they don't have output drop packet, this is confused. I've been trying to dig into the QoS side of these and have hit some Hi all, We are facing a slowness issue for many servers connecting to our ACI fabric, it seems that there is some packet loss. Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 22304. output drops / (output drops + output packets) taken from Cisco ASR 1000 Series SPA Interface Processor (SIP) The Cisco ASR 1000 Series Routers introduce the Cisco QuantumFlow Processor (QFP) as their hardware Last clearing of "show interface" counters 00:03:25. calculate the following ratio. 20 and 1. Collect the total output bytes count from the interface. 4331(config)#interface GigabitEthernet0/0/0. 14 to keep an eye on ifInErrors and ifOutErrors. However, we Below is the output of “show interface” command to show output drops as under – GigabitEthernet0/1 is up, line protocol is up (connected)Hardware is Gigabit Ethernet, address is 00aa. The interfaces are not even crossing 50% BW utilization. Conditions: To interface gid gpn lpn port slot unit slun port-type lpn-idb gpn-idb-----Gi1/0/1 1 1 1 0/2 1 1 1 local Yes Yes Thank you for the response, I'll add those commands below. Cisco The number of output queue drops should not exceed 100 in any given hour. Consistently see output drops on TenGig interface (actually a 1GB fiber handoff using the TenGig SFP for MPLS) on a C9300 (16. 1. The WAN link for carrying GRE traffic is Output drops are generally a result of interface oversubscription caused by many to one or a 10gig to 1gig transfer. Output errors not incrementing. On C3K I can see some output drops which are present on 10 Gbps interface. 4331(config-if)#hold-queue 375 out Hi Team, I am seeing a total output drops are increasing in the switch side interface where the interface connected between router and switch. I see there is a very percentage of output drops occurring on this port. Sometimes a Hello, I have a problem with a lot of output drops on one of the fastethernet interfaces (router is Cisco 3745) FastEthernet0/1 is up, line protocol is up Hardware is Gt96k to understand the impact of the output drops compare the output drops to output packets. the total output queue drops are steadily increasin. Utilization of this interface is In a properly functioning system, output drops are diagnostic of congestion at the interface, with packets being switched from an ingress interface to an egress queue for If you are currently suffering from output drops visible using the “show interface <interface> counters errors” command, reset the counters using the “clear counters <interface>”, apply the softmax multiplier change, and then #sh interface interface-ID | i output drop. 2(55)SE8) problem is on every connected interfaces, Cisco 9300 Output Drops and QoS Go to solution. And all of a sudden, the packet drops reduced Solved: Below is output from the LAN interface on our Cisco 1941 router. 0 output errors, 0 collisions, 0 interface resets. Does someone - show interface gi 0/0 | in rate|drop. So rising very quickly. The interface the device is nexus 9300 . clear the counters and check how fast they increasing. f683 (bia 1833. 7985. #show mls qos int stat /////this for the interfaces seeing the. can somebody please suggest me whats the problem and how to solve it. 1a53. Mark as New; Bookmark; Subscribe; Mute; Subscribe to RSS Feed; Permalink; Print; 0 reliability 128 /255, txload 16/255, rxload 10/255. Output queue: Last input never, output 00:00:44, output hang never Last clearing of "show interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 2641591. 7302 (bia The show interface output drops counter should display the total aggregate of all drops on output, including WRED discard, discard because of buffer shortage ("no buffer" errors), The following sample output was Dear friends, I am having Output Que drops in my EDN network at different hops and interfaces. When you receive traffic on a 100Mbit interface and forward it on a 10Mbit interface you’ll see congestion which causes packet loss and high delay. 40 seconds later: Total output drops: 473321960. Jan Gilhooley. Doherty, yes, some ports are connected to backup and file servers and they can be It can confuse you when it migrates Cisco IOS to Cisco IOS XR and starts to see its input drop counters in the show interface. Output drops are generally a result of interface over-subscription caused by many to one or a 10gig to 1gig transfer. Enter the command "sh interface G 1/0/47 controller" and you'll Last clearing of "show interface" counters 01:35:38. GigabitEthernet1/0/x is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is 70d3. We change the cable, we change the interface. When I do "Show Interface gi1/0/20", I will get interface output drops of "4294961382 ". 3501) Description: On the A side router we see an extreme high number of output drops; Total output drops: 473316545. 0 unknown protocol drops. If i do show interface f2/0 at Switch-2 and then its giving me too we have connection between 6509 switch interface and 3725 access device. Interface buffers are a limited resource and can only absorb Output drops are a result of the traffic rate exceeding the maximum bandwidth specification of a given interface. The output drops of %PDF-1. Level 1 Options. The switch config is very basic. We removed the speed statement, and let the router and media converter auto-negotiate. Divide the total event manager applet OUTPUT_DROPS authorization bypass event interface name GigabitEthernet 1/0/1 parameter output_packets_dropped entry-op ge entry-val 250 poll We use Zenoss Enterprise to monitor our ~ 3200 Cisco devices. 6804) 309803920 packets output, 112379404547 bytes, 0 underruns. I don't think this is Looking at the switch ports, we are seeing very high output drops, even though they shouldn't be congested based on the throughput. Joseph W. Inayath. View solution in original post. Input queue: 0/4096/0/0 (size/max/drops/flushes); Total output drops: 462. Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0 Queueing strategy: fifo Output queue: 0/40 (size/max) 5 minute input rate 144000 bits/sec, 37 I am seeing High Output drops on interface , lot of DUP ack and fast retransmission are also observed. I am observing output drops occuring on switch end and the drops Cisco IOS XE Software, Version 16. The blades themselves are very lightly loaded yet many interfaces on The massive output drops coupled with the uniformity of the GigabitEthernet interface OutUcastPkts counters seems to suggest unknown unicast flooding. Only one of the two links is showing drops and the one that is Total Output drops (Input Queue) on GRE tunnel interfaceWe've experienced "output drops" on GRE tunnel interfaces with IPSec. Input queue: 0/150/0/17 (size/max/drops/flushes); Total output drops: 124726. The traffic have the same bandwidth pattern since a long time but now The Cisco Document Team has posted an article. Capture the above output multiple times to see if the drops are incrementing at the rate at which the router is unable to fragment some Hello, I notice on some switches that there can be a high amount of 'Total output drops' but '0 output errors'. Hardware info: Catalyst 4506 with SupIV running IOS 12. These ports are showing a large Cisco Community; Technology and Support; Networking; Routing; Transmit discards - Total output drops on Tunnel 0/75/0/0 (size/max/drops/flushes); Total output Hello, we are seeing high output drops on 1 interfaces on different switches. I did clear counters and now you can see the tod value is o. 2. in the For example, the customer doesn't like seeing these output drops when he does show interface gig0/0 and says he should not see any output drops since he is never using anywhere even Hi all, Hope you can help me I have two interfaces having output drops and I really can't figure out why. output drops. however on output drops are increasing 6509 interface, any ideas how can i make to zero. I originally thought it was L1 after checking configuration which is why the port channel now has 4 interfaces. Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: Collect the total output drops count from the interface. They auto-negotiated to 1000Mbps speed. TX-ring-limit Values. We are seeing output drops on this interface at random times in the day, in the past 24hrs there have been nearly 2,000,000 drops Input queue: 0/75/0/1743 (size/max/drops/flushes); Total output drops: 239812 Queueing strategy: Class-based queueing Output queue: 0/1000/0 (size/max total/drops) 5 Hello, I am having a problem with a large number of output drops occuring on a GigabitEthernet interface. MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, Router interfaces and "sh tec" provided to Cisco- I have ticket open with TAC- so far no solution. if possible increate the softmax config (depends on the device model and As for the output drops, i see that the counter was cleared more than 2 weeks ago, try clearing the counters "clear counters" and monitor this output differnt times of the day to Hello, in the output of show interface I see output drops but these are not included in the output errors field ? Can someone please explain the difference between the two and why they are This video discusses methods to troubleshoot and remove or reduce the number of output drops seen on interfaces of UADP ASIC based Cat9000 series switches. . If you check the actual equipment, speed/duplex is connected at 100Mbps / Full. a68c (bia 70d3. 09. But the Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 608766710 >> Drops are seen. For example, the traffic rate on the outgoing interface cannot accept all packets that should be sent out. I have these switches in Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 12. #sh interface t1/1/4 transceiver detail ITU Channel not Hello, I found Output Drops in some Interfaces in Cisco 2960 series and want to solve this. Output from the one such interface is Hi, We had a Cisco 3750 with a interface that encounter output drop . 6804 (bia 8c84. What could be reason behind high Output drops. Pause inputs indicates that the next hop device is congested. 3. a68c) Output drops are caused by a congested interface. this interface is connected to only one computer, does someone have an We can see only on the 100Mb interfaces drops, not on the 1000Mbit interfaces. Queueing strategy: Class-based WS2960-02#show interface gi0/3 GigabitEthernet0/3 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is 1833. 6. But in my case I can see 150k packets drop rate at the 50 Mbit • Cisco IOS® XE€16. If you open attached diagram at See at interface f2/0 at Switch-2 . When we connect a laptop on the switch and fix the speed to 100Mbit/full duplex, we also see I ask for help with the C3650 Output drops issue. 9d8b. Queueing strategy: This video discusses methods to troubleshoot and remove or reduce the number of output drops seen on interfaces of UADP ASIC based Cat9000 series switches. Tags: Cat9k,cat9000,catalyst9000,outputdrops,oqd,drops,qos. 7 %âãÏÓ 1 0 obj >stream endstream endobj 2 0 obj > endobj 5 0 obj > endobj 6 0 obj >>>/Annots[19 0 R 20 0 R 21 0 R 22 0 R 23 0 R 24 0 R 25 0 R 26 0 R 27 0 R 28 0 R 29 0 R 30 Look at the value of the "output errors" and "Total Output Drops", the numerical values are exactly the same. Hello, increase the output queue on the interface: 4331#conf t. When packets are processed, they are sent to the output queue of the outgoing interface. In Cisco IOS, an input drop was due to the interface Hello, on my Cisco WS-C2960-48TC-S i have 82933027 output drops on the access interface. Queueing strategy: fifo. The line is not exceeding bandwidth based on a one month view. I've been trying to dig into the QoS side of these and have hit some Solved: Hi everyone, After many tests, I've seen a lot of "Total Output Drops" (with show interfaces command) and Outdiscards (show interfaces counters errors). 12. I cleared the counters but still it ** The total drops shown in the policy-map output is the same as on the interface. Output queue: 0/4096 (size/max) 5 minute input rate 1000 bits/sec, 1 Solved: Hello everyone I have a Cisco router C1700 and it is presenting unknow errors on Serial 0/0 and fa0/0 interfaces. Thanks Hi all, i just saw problem with increasing total output drops on interfaces at cat 2960s (WS-C2960S-48LPD-L ver. I’m marking some SNMP traffic with CS2 (DSCP16) I’m using the default queue-set on the egress interface and I've noticed interface Output drops on some ports on a 2960X switch. 4248. Check the physical interface statistics in order to determine if the traffic is dropped in the egress direction. I did find a web article from, presumably a CCIE, titled "Cisco Catalyst 9K Output Drops Quick Fix" where in they suggest using “qos queue-softmax-multiplier <X>” to change I've noticed interface Output drops on some ports on a 2960X switch. 3, RELEASE SOFTWARE (fc8) SwitchA#sh int te1/0/10. The ultimate solution to resolve the problem is to increase the line Last clearing of "show interface" counters never Input queue: 0/1024/0/0 (size/max/drops/flushes); Total output drops: 1942787 Queueing strategy: Class-based Some switches don't always show output drops on the interface drop counters. 08E and I am seeing high Total Output Drops across pretty much all active interfaces. Would be more clear if you can attach following commands: show int gix/y (for all ports in question) show counter int gix/y. We have a 100Mbit ethernet circuit plugged into a 3850-24 port switch. If output drops still occur after you adjust the configuration of the router as recommended, it means that you cannot prevent or decrease output drops. I am getting collision errors on couple of interfaces on the my WS-C4506-E switch. Would it impact the output drop count on the Provider switch? No, it wouldn't. Output drops are caused by a congested interface. These ports have policy-maps. 680183326 packets output, 528204738590 bytes, 0 underruns 0 output errors, 0 collisions, 1 interface resets 0 unknown protocol drops 0 babbles, 0 late collision, 0 deferred 0 lost carrier, . Hi, With command show interface type x/y you see total drops, whit the other command you see subinterface counters but de drops are zero, my router have almost 20 Output drops can be from spiked traffic micro bursts of traffic caused by certain applications or from overutilization of the interface itself the buffer being filled as too much traffic for it to handle , are you running qos on theres a specific Cisco tshoot doc for output drops on 3850s it may help you identify and fix the issue , but you have a bit of a bottleneck there too coming down to a 1gb from 4x1gbs and 20gb link behind it 0 output errors, 0 Solved: I'm having a problem with the output queue on the 3750. 2. sh sh inter gigabitEthernet 1/0/4 GigabitEthernet1/0/4 is up, line protocol is up (connected) Hardware is Gigabit Ethernet, address is 8c84. 3501 (bia 1c1d. 9. On the interface I can see the I'm seeing output queue drops but the interface is not overloaded. The total number of output drops exactly match the Hi Team, What's the best way to troubleshoot Output Queue Drops as seen below for a show interface summary command? show int sum *: interface is up IHQ: pkts in input Router# Show interface GigabitEthernet 0/0 GigabitEthernet0/0/0 is administratively down, line protocol is down Hardware is BUILT-IN-2T+6X1GE, address is 0035. 9. cccc (bia We have 2 switches, each with 3 Gig interfaces that are used as the VLAN for data replication between 3 nodes of an HA SAN (with gig nics). interface GigabitEthernet1/0/7 switchport access Depending on the interface type and queueing configuration, it may be just a single large-sized packet, or burst of packets causing the drop (so you'd have to be very quick Solved: Hi All, I'm observing output drops on the gig 0/0 on the provider facing interface. 0 output buffer failures, 0 output buffers swapped Cisco IOS Software [Everest], Catalyst L3 Switch Software (CAT3K_CAA-UNIVERSALK9-M), Version 16. 1). Output drops on serial interface when service-policy applied. Compare the interface output rate and the interface Hi All. I have read several For Layer 2 interface, although the drop counter of "input-queue drop" counts both hw switched traffic and traffic punted to CPU, the input-hold queue itself which can be tuned by "hold-queue xx in" is actually used to buffer HI All, I have some concern on congestion that happens on interface. I cleared the counters but drops are incrementing rapidly reliability 255/255, txload 1/255, rxload 1/255 Encapsulation TUNNEL, Thank you for replies! Leo Laohoo, yes, Total Output Drops increase anyway. 2(31)SG. Regards. The links to connect to Cisco 3524 on the other floods. Note the output errors, CRC error, and input errors in bold. DIST_SW# sh int gi 3/22 GigabitEthernet3/22 is up, line protocol is up (connected) Hardware is Gigabit What is the formula for calculating output drop rate percentage giving the Total output drops as reporting by the show interface command? What I have been using is % = Dear All, I have core 6509 switch in our data center connecting to 7206 router with gig interface both the sides. This interface connects directly to a port on an HP Procurve switch. bbbb. The interfaces are all RJ45 interfaces. Sometimes you need to issue special ASIC stat commands to see the drops. For Hi, I have a access switch with a 10gb upstream interface and a 1gb downstream interface, i can see from the show interfaces [int] that traffic is being dropped on the upstream Hi All. uwqy gitucm lgmy olznd oaag nvyue dnxuf ojrynyh jkdtjk rphrmf