Total OUTPUT errors are increasing

pcclonescisco · ‎05-16-2012

--Port changed

--Cable Changed

--Switch Changed

--Still i am getting total output errors increasing. Please find the output :

Switch_C2960#show mls qos maps cos-output-q

Cos-outputq-threshold map:

cos: 0 1 2 3 4 5 6 7

------------------------------------

queue-threshold: 2-1 2-1 3-1 3-1 4-1 1-1 4-1 4-1

Switch_C2960#

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Switch_C2960#show int gi 0/2 | i drop

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 6730674

Switch_C2960#show int gi 0/2 | i drop

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 6744503

Switch_C2960#show int gi 0/2 | i drop

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 6750775

Switch_C2960#

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Switch_C2960#show int gi 0/2

GigabitEthernet0/2 is up, line protocol is up (connected)

Hardware is Gigabit Ethernet, address is 0064.40e2.049a (bia 0064.40e2.049a)

MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,

reliability 255/255, txload 120/255, rxload 119/255

Encapsulation ARPA, loopback not set

Keepalive not set

Full-duplex, 100Mb/s, link type is auto, media type is 10/100/1000BaseTX

input flow-control is off, output flow-control is unsupported

ARP type: ARPA, ARP Timeout 04:00:00

Last input never, output 00:00:00, output hang never

Last clearing of "show interface" counters 00:19:05

Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 6861499

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 46696000 bits/sec, 30735 packets/sec

5 minute output rate 47231000 bits/sec, 30942 packets/sec

34276803 packets input, 6544806578 bytes, 0 no buffer

Received 115 broadcasts (0 multicasts)

0 runts, 0 giants, 0 throttles

0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

34512247 packets output, 6621715081 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 babbles, 0 late collision, 0 deferred

0 lost carrier, 0 no carrier, 0 PAUSE output

0 output buffer failures, 0 output buffers swapped out

Switch_C2960#

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Switch_C2960#show run int gi 0/2

Building configuration...

Current configuration : 88 bytes

!

interface GigabitEthernet0/2

switchport access vlan 835

switchport mode access

end

Switch_C2960#

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Switch_C2960#show platform port-asic stats drop port 0

Port-asic Port Drop Statistics - Summary

========================================

RxQueue 0 Drop Stats: 0

RxQueue 1 Drop Stats: 0

RxQueue 2 Drop Stats: 0

RxQueue 3 Drop Stats: 0

Port 0 TxQueue Drop Stats: 63277066

Port 1 TxQueue Drop Stats: 0

Port 2 TxQueue Drop Stats: 49383178

Port 3 TxQueue Drop Stats: 51758832

Port 4 TxQueue Drop Stats: 9275671

Port 5 TxQueue Drop Stats: 53647146

Port 6 TxQueue Drop Stats: 53858100

Port 7 TxQueue Drop Stats: 53857557

Port 8 TxQueue Drop Stats: 159897632

Port 9 TxQueue Drop Stats: 8246366

Port 10 TxQueue Drop Stats: 8246193

Port 11 TxQueue Drop Stats: 0

Port 12 TxQueue Drop Stats: 0

Port 13 TxQueue Drop Stats: 207

Port 14 TxQueue Drop Stats: 46213276

Port 15 TxQueue Drop Stats: 264923216

Port 16 TxQueue Drop Stats: 53862249

Port 17 TxQueue Drop Stats: 51784865

Port 18 TxQueue Drop Stats: 53894071

Port 19 TxQueue Drop Stats: 126518775

Port 20 TxQueue Drop Stats: 0

Port 21 TxQueue Drop Stats: 0

Port 22 TxQueue Drop Stats: 0

Port 23 TxQueue Drop Stats: 3349011

Port 24 TxQueue Drop Stats: 146400088

Port 25 TxQueue Drop Stats: 54561450

Supervisor TxQueue Drop Statistics

Queue 0: 0

Queue 1: 0

Queue 2: 0

Queue 3: 137

Queue 4: 0

Queue 5: 0

Queue 6: 0

Queue 7: 0

Queue 8: 11120745

Queue 9: 0

Queue 10: 0

Queue 11: 0

Queue 12: 0

Queue 13: 0

Queue 14: 0

Queue 15: 0

Port-asic Port Drop Statistics - Details

========================================

RxQueue Drop Statistics

Queue 0

Weight 0 Frames: 0

Weight 1 Frames: 0

Weight 2 Frames: 0

Queue 1

Weight 0 Frames: 0

Weight 1 Frames: 0

Weight 2 Frames: 0

Queue 2

Weight 0 Frames: 0

Weight 1 Frames: 0

Weight 2 Frames: 0

Queue 3

Weight 0 Frames: 0

Weight 1 Frames: 0

Weight 2 Frames: 0

Port 0 TxQueue Drop Statistics

Queue 0

Weight 0 Frames 0

Weight 1 Frames 0

Weight 2 Frames 0

Queue 1

Weight 0 Frames 63290911

Weight 1 Frames 1

Weight 2 Frames 0

Queue 2

Weight 0 Frames 0

Weight 1 Frames 0

Weight 2 Frames 0

Queue 3

Weight 0 Frames 0

Weight 1 Frames 0

Weight 2 Frames 0

Supervisor TxQueue Drop Statistics

Queue 0: 0

Queue 1: 0

Queue 2: 0

Queue 3: 137

Queue 4: 0

Queue 5: 0

Queue 6: 0

Queue 7: 0

Queue 8: 11120745

Queue 9: 0

Queue 10: 0

Queue 11: 0

Queue 12: 0

Queue 13: 0

Queue 14: 0

Queue 15: 0

Switch_C2960#

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smehrnia · ‎05-17-2012

hello,

try a different qos / queueing method.

this Links might help:

http://www.cisco.com/en/US/products/hw/routers/ps133/products_tech_note09186a0080094791.shtml

its Bcoz of ur traffic pattern n flows.

plz Rate if it helped

Hope it Helps!

Soroush.

pcclonescisco · ‎05-17-2012

one more finding..

when i connect a laptop on the same port, i dont see any output drops increasing..only if i connect a firewall, the output drops are increasing.

do u still want me to try queueuing method ?

paolo bevilacqua · ‎05-17-2012

Remove all and any QoS or mls commands. That for one will make the switch work the best.

However note that the interface is running 100 Mbps.If you want to avoid drops. run it at 1Gbps.

Mahesh Gohil · ‎05-17-2012

Hi,

Can you try changing hold-queue limit to maximum if your switch support it ?

Command under interface level is:

hold-queue 4096 in

hold-queue 4096 out

Regards # Mahesh

smehrnia · ‎05-17-2012

Of course, a firewall (if its active) would generate more traffic than a laptop to cause drops... so what u need is to try different things to figure out what solves the problem ;-) u r at the scene, we r just speculating

Hope it Helps!

Soroush.

pcclonescisco · ‎05-17-2012

unable to disable mls qos on the switch:

Switch_C2960#show mls qos

QoS is enabled

QoS ip packet dscp rewrite is enabled

Switch_C2960#conf t

Enter configuration commands, one per line. End with CNTL/Z.

Switch_C2960(config)#mls qos ?

aggregate-policer Named aggregate policer

map qos map keyword

queue-set Choose a queue set for this queue

rewrite Rewrite Packet/Frame

srr-queue Configure SRR receive queues

Switch_C2960(config)#mls qos

----Other end wont support 1Gig and the traffic is not crossing more than 60Mbps

----About the Hold-queue:

Caution: An increase in the hold queue can have detrimental effects on network routing and response times. For protocols that use SEQ/ACK packets to determine round-trip times, do not increase the output queue. Dropping packets instead informs hosts to slow down transmissions to match available bandwidth. This is generally better than duplicate copies of the same packet within the network, which can happen with large hold queues.

So i need to get a down time to increase the hold queue.