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]
View 8 RepliesI 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]
View 10 Replies View RelatedI 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
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?
View 4 Replies View RelatedI 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]
View 9 Replies View RelatedI 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.
View 1 Replies View Relatedi 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 ?
Our customer get the problem that the switch count the 5mins input/output rate of connected traffic interface always ZERO.The problem only occur in the module 3,4 and 5 interface, module 2 has no problems.
-------------------------------------------------------------------------------------------------
Catayst 4506E
12.2(52)SG
Chassis Type : WS-C4506-E
Power consumed by backplane : 0 Watts
Mod Ports Card Type Model Serial No.---+-----+--------------------------------------+------------------+-----------1 6 Sup 6-E 10GE (X2), 1000BaseX (SFP) WS-X45-SUP6-E 2 48 10/100/1000BaseT (RJ45) WS-X4548-GB-RJ45 3 48 10/100/1000BaseT (RJ45) WS-X4648-RJ45-E 4 48 10/100/1000BaseT (RJ45) WS-X4648-RJ45-E 5 48 10/100/1000BaseT (RJ45) WS-X4648-RJ45-E
[code]....+
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?
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
View 4 Replies View RelatedI 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].....
i have an 2921 connected to an Catalyst 3560. My router interface shows quite a lot of input queue drops. Load is not too much max 5/255.
View 1 Replies View RelatedHaving an issue with two Cat 2940, they have fiber 100Base-TX. Added a new Cat switch (the second on the VLAN), the existing Cat switch drops the fiber connection.
View 6 Replies View RelatedI have been looking into this for a while and I can't seem to figure out why my 2nd vlan is not able to connect properly to the net.
My switch has 12 ports where my devices connects directly, they are all on Vlan 1 and they all work perfectly. on Port 12 I have a dlink router that is connected to a cable modem. the dlink router has an Ip address of 192.168.0.20
I created a second vlan (vlan2) and enabled dhcp relay on it. then I assigned port 9 on the switch to (vlan2)my laptop which is connected to port 9 seems to get an ip address fine and able to ping only some devices on my network (vlan1) and is not able to go out to the internet. I think it has to do with the routes. [code]
I have been looking into this for a while and I can't seem to figure out why my 2nd vlan is not able to connect properly to the net. My switch has 12 ports where my devices connects directly, they are all on Vlan 1 and they all work perfectly. on Port 12 I have a dlink router that is connected to a cable modem. the dlink router has an Ip address of 192.168.0.20,I created a second vlan (vlan2) and enabled dhcp relay on it. then I assigned port 9 on the switch to (vlan2),my laptop which is connected to port 9 seems to get an ip address fine and able to ping only some devices on my network (vlan1) and is not able to,go out to the internet.
View 3 Replies View RelatedIn my ongoing project i need to monitor cisco 3750-X port status (uplink/downlink) i.e. whenever there is some problem at a specific port. I need to monitor it through an OPC server and right now what i am doing is as follows: i am using Kepserver and i have added SNMP driver in it for that purpose i am not a networking expert but what i have learnt till now is that SNMP agent (that resides in switch) delivers the status of MIBs to SNMP manager ( which in my case is kepserver (opc server)) for the above purpose i am adding IF-MIB to monitor OID 1.3.6.1.2.1.2.2.1.8 (which shows port statuses) but when i add that in OPC server then it indicated that this OID is not available in the Switch ( it might be disabled) so i need to ask if there is any way to enable OID's in a switch,
View 0 Replies View RelatedI have got a new 48port Cisco catalyst 4948 switch, which I configured as a VTP client and connected to Cisco 3750 which is a VTP Server (this switch is on production network). I connected port g1/0/48 from 3750 to port g1/48 on 4948 through a straight cable and made both ports as trunk port (I also tried through cross cable). The problem is these two switches are not detecting. For testing I connected a PC directly to one of the port on 4948 (making that a switch port) still the LED on switch didn’t glow up. Is there any special command needs to be run on 4948 switches to activate its physical ports?
View 7 Replies View Related The Catalyst 3750 switch reboots, and the " Reloading because of stack merge or communication failure" error message appears.
I saw this issue at "Cisco wiki" but the resolution in that page is just "Open a case with TAC". Because of the reasion is H/W Problem.
Is The resolution only one ? anything else? The 3750 does not use Stack.It is just stand alone. So i think it has other resolution as "disabling Stack" or another one. How about my opinion ? Is the Resolution only "Open a Case with TAC"
I want to limit the bandwidth of my Catalyst 3750 series switch, I read the cisco documentation and I applied the commands but I didn't get the wanted results.
For the outbound traffic it's ok, but for the inbound traffic I used policing but I get an unstable traffic. I used, an access list and a class-map to classify the traffic and then a policy-map.(I followed the steps mentioned in this site: [URL]
Is there a way to change interface numbers on a 3750 stack but, still retain the config of the physical port?
For instance:
I would like to take the top switch, which has the ports numbered g2/0/1 - 52 and change them to be g1/0/1 - 52. And the bottom switch, which has ports numbered g1/0/1 - 52 and change them to be g2/0/1 - 52. Basically, just swap the interface numbers but, not effect any interface configurations.
On a router I can use IP Accounting or Netflow to see what kind of traffic is moving over an interface. Are there any tools on a 3750 switch with a routed interface which would tell you who is hogging the bandwidth on that interface?
View 2 Replies View RelatedI have cisco 887M-K9 router and I can see output drops are increasing on ATM interface. [code]
View 9 Replies View RelatedI 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.
View 25 Replies View RelatedWe 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?
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]....
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]
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.
View 5 Replies View RelatedI 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]
View 1 Replies View RelatedI 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?
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].....
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].....
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?
MIB OID and the values.also i want to know the values og output packet and output packet drops MIB OID values of POS interface on GSR router (12000).because i am getting many output packet drops on these pos interface.how do i get these values from the router.
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