Packet drops on queue on 6509 even though QOS is disabled

Zeeshan Siddiqui · ‎03-09-2013

Much apprecited if you can assist with the following

I can see drops on the 6509 Queue for interface gi1/6 , qos is disabled globaly with qos disabled all packets are in one Queue using best effort my question is if I can see drops using the sh queueing int Gi1/6 command why I am not seeing any drops when I run the Sh int (interface number ) command, pls help in confirming which one is right and which one is wrong (As always thanks in advance)

I have highlight the important bits in the show command below

#sh queueing interface gi1/6

Interface GigabitEthernet1/6 queueing strategy: Weighted Round-Robin

QoS is disabled globally

Trust state: trust DSCP

Extend trust state: not trusted [COS = 0]

Default COS is 0

Queueing Mode In Tx direction: mode-cos

Transmit queues [type = 1p3q8t]:

Queue Id Scheduling Num of thresholds

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

01 WRR 08

02 WRR 08

03 WRR 08

04 Priority 01

WRR bandwidth ratios: 100[queue 1] 0[queue 2] 0[queue 3]

queue-limit ratios: 100[queue 1] 0[queue 2] 0[queue 3]

queue tail-drop-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

2 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

3 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

queue random-detect-min-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

2 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

3 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

queue random-detect-max-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

2 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

3 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

WRED disabled queues: 1 2 3

queue thresh cos-map

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

1 1 0 1 2 3 4 5 6 7

1 2

1 3

1 4

1 5

1 6

1 7

1 8

2 1

2 2

2 3

2 4

2 5

2 6

2 7

2 8

3 1

3 2

3 3

3 4

3 5

3 6

3 7

3 8

4 1

Queueing Mode In Rx direction: mode-cos

Receive queues [type = 1q8t]:

Queue Id Scheduling Num of thresholds

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

01 WRR 08

WRR bandwidth ratios: 100[queue 1]

queue-limit ratios: 100[queue 1]

queue tail-drop-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

queue thresh cos-map

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

1 1 0 1 2 3 4 5 6 7

1 2

1 3

1 4

1 5

1 6

1 7

1 8

Packets dropped on Transmit:

queue dropped [cos-map]

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

1 999434248 [0 1 2 3 4 5 6 7 ]

2 0 []

3 0 []

4 0 []

Packets dropped on Receive:

queue dropped [cos-map]

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

1 0 [0 1 2 3 4 5 6 7 ]

sh int Gi1/6

GigabitEthernet1/6 is up, line protocol is up (connected)

Hardware is C6k 1000Mb 802.3, address is 0011.938a.c311 (bia 0011.938a.c311)

Description: KB-SR2-3750-1

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 47/255, rxload 29/255

Encapsulation ARPA, loopback not set

Full-duplex, 1000Mb/s, media type is SX

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

Clock mode is auto

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

Last input 00:00:14, output 00:00:37, output hang never

Last clearing of "show interface" counters 25w5d

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 117181000 bits/sec, 12429 packets/sec

5 minute output rate 186908000 bits/sec, 41943 packets/sec

334406731490 packets input, 243949476142597 bytes, 0 no buffer

Received 56321478 broadcasts (46821798 multicast)

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

972231767415 packets output, 819107739728278 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

InayathUlla Sharieff · ‎03-10-2013

Hi Zeeshan,

Can you please let me know what type of module is this? And can you check the drop on any other interface?

Eg: G1/5-8 and paste the outputs here.

Regards

Inayath

Zeeshan Siddiqui · ‎03-11-2013

Hi Sharief,

MAny Thanks for your response pls find stats below ( I have highlighted Gi1/5 is seeng an simillar output )

IOS ===== sup-bootflash:s72033-psv-mz.122-18.SXD3.bin

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

1 48 CEF720 48 port 1000mb SFP WS-X6748-SFP (module 1)

2 48 CEF720 48 port 1000mb SFP WS-X6748-SFP

3 48 CEF720 48 port 10/100/1000mb Ethernet WS-X6748-GE-TX

5 2 Supervisor Engine 720 (Active) WS-SUP720-BASE

6 24 CEF720 24 port 1000mb SFP WS-X6724-SFP

7 48 CEF720 48 port 1000mb SFP WS-X6748-SFP

KB-SR1-6509-1#sh int Gi1/5

GigabitEthernet1/5 is up, line protocol is up (connected)

Hardware is C6k 1000Mb 802.3, address is 0011.938a.c310 (bia 0011.938a.c310)

Description: KB-SR2-3750-1

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 27/255, rxload 5/255

Encapsulation ARPA, loopback not set

Full-duplex, 1000Mb/s, media type is SX

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

Clock mode is auto

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

Last input 00:00:43, output 00:00:44, output hang never

Last clearing of "show interface" counters 26w0d

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 19745000 bits/sec, 7084 packets/sec

5 minute output rate 108463000 bits/sec, 16729 packets/sec

241773594031 packets input, 136899269013443 bytes, 0 no buffer

Received 671633855 broadcasts (605934970 multicast)

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

579219400946 packets output, 545611531691575 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

KB-SR1-6509-1#

KB-SR1-6509-1#sh int Gi1/7

GigabitEthernet1/7 is up, line protocol is up (connected)

Hardware is C6k 1000Mb 802.3, address is 0011.938a.c312 (bia 0011.938a.c312)

Description: KB-BA-2950-1

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Full-duplex, 1000Mb/s, media type is SX

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

Clock mode is auto

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

Last input 00:00:24, output 00:00:45, output hang never

Last clearing of "show interface" counters 26w0d

Input queue: 0/2000/371/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 5000 bits/sec, 8 packets/sec

5 minute output rate 74000 bits/sec, 89 packets/sec

539693149 packets input, 129418363989 bytes, 0 no buffer

Received 19516879 broadcasts (7454557 multicast)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

2835803551 packets output, 753743605221 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

KB-SR1-6509-1#

KB-SR1-6509-1#sh int Gi1/8

GigabitEthernet1/8 is up, line protocol is up (connected)

Hardware is C6k 1000Mb 802.3, address is 0011.938a.c313 (bia 0011.938a.c313)

Description: KB-BB-2950-1

MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation ARPA, loopback not set

Full-duplex, 1000Mb/s, media type is SX

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

Clock mode is auto

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

Last input 00:00:17, output 00:00:48, output hang never

Last clearing of "show interface" counters 26w0d

Input queue: 0/2000/326/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

5 minute input rate 36000 bits/sec, 36 packets/sec

5 minute output rate 225000 bits/sec, 143 packets/sec

421876077 packets input, 104715544364 bytes, 0 no buffer

Received 23202949 broadcasts (4202628 multicast)

0 runts, 0 giants, 0 throttles

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

0 watchdog, 0 multicast, 0 pause input

0 input packets with dribble condition detected

2953680934 packets output, 585323146311 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

KB-SR1-6509-1#sh queueing interface Gi1/5

Interface GigabitEthernet1/5 queueing strategy: Weighted Round-Robin

QoS is disabled globally

Trust state: trust DSCP

Extend trust state: not trusted [COS = 0]

Default COS is 0

Queueing Mode In Tx direction: mode-cos

Transmit queues [type = 1p3q8t]:

Queue Id Scheduling Num of thresholds

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

01 WRR 08

02 WRR 08

03 WRR 08

04 Priority 01

WRR bandwidth ratios: 100[queue 1] 0[queue 2] 0[queue 3]

queue-limit ratios: 100[queue 1] 0[queue 2] 0[queue 3]

queue tail-drop-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

2 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

3 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

queue random-detect-min-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

2 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

3 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

queue random-detect-max-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

2 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

3 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

WRED disabled queues: 1 2 3

queue thresh cos-map

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

1 1 0 1 2 3 4 5 6 7

1 2

1 3

1 4

1 5

1 6

1 7

1 8

2 1

2 2

2 3

2 4

2 5

2 6

2 7

2 8

3 1

3 2

3 3

3 4

3 5

3 6

3 7

3 8

4 1

Queueing Mode In Rx direction: mode-cos

Receive queues [type = 1q8t]:

Queue Id Scheduling Num of thresholds

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

01 WRR 08

WRR bandwidth ratios: 100[queue 1]

queue-limit ratios: 100[queue 1]

queue tail-drop-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

queue thresh cos-map

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

1 1 0 1 2 3 4 5 6 7

1 2

1 3

1 4

1 5

1 6

1 7

1 8

Packets dropped on Transmit:

queue dropped [cos-map]

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

1 1194074609 [0 1 2 3 4 5 6 7 ]

2 0 []

3 0 []

4 0 []

Packets dropped on Receive:

queue dropped [cos-map]

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

1 0 [0 1 2 3 4 5 6 7 ]

KB-SR1-6509-1#

KB-SR1-6509-1#sh queueing interface Gi1/7

Interface GigabitEthernet1/7 queueing strategy: Weighted Round-Robin

QoS is disabled globally

Trust state: trust DSCP

Extend trust state: not trusted [COS = 0]

Default COS is 0

Queueing Mode In Tx direction: mode-cos

Transmit queues [type = 1p3q8t]:

Queue Id Scheduling Num of thresholds

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

01 WRR 08

02 WRR 08

03 WRR 08

04 Priority 01

WRR bandwidth ratios: 100[queue 1] 0[queue 2] 0[queue 3]

queue-limit ratios: 100[queue 1] 0[queue 2] 0[queue 3]

queue tail-drop-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

2 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

3 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

queue random-detect-min-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

2 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

3 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

queue random-detect-max-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

2 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

3 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

WRED disabled queues: 1 2 3

queue thresh cos-map

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

1 1 0 1 2 3 4 5 6 7

1 2

1 3

1 4

1 5

1 6

1 7

1 8

2 1

2 2

2 3

2 4

2 5

2 6

2 7

2 8

3 1

3 2

3 3

3 4

3 5

3 6

3 7

3 8

4 1

Queueing Mode In Rx direction: mode-cos

Receive queues [type = 1q8t]:

Queue Id Scheduling Num of thresholds

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

01 WRR 08

WRR bandwidth ratios: 100[queue 1]

queue-limit ratios: 100[queue 1]

queue tail-drop-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

queue thresh cos-map

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

1 1 0 1 2 3 4 5 6 7

1 2

1 3

1 4

1 5

1 6

1 7

1 8

Packets dropped on Transmit:

queue dropped [cos-map]

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

1 0 [0 1 2 3 4 5 6 7 ]

2 0 []

3 0 []

4 0 []

Packets dropped on Receive:

queue dropped [cos-map]

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

1 0 [0 1 2 3 4 5 6 7 ]

KB-SR1-6509-1#

KB-SR1-6509-1#sh queueing interface Gi1/8

Interface GigabitEthernet1/8 queueing strategy: Weighted Round-Robin

QoS is disabled globally

Trust state: trust DSCP

Extend trust state: not trusted [COS = 0]

Default COS is 0

Queueing Mode In Tx direction: mode-cos

Transmit queues [type = 1p3q8t]:

Queue Id Scheduling Num of thresholds

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

01 WRR 08

02 WRR 08

03 WRR 08

04 Priority 01

WRR bandwidth ratios: 100[queue 1] 0[queue 2] 0[queue 3]

queue-limit ratios: 100[queue 1] 0[queue 2] 0[queue 3]

queue tail-drop-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

2 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

3 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

queue random-detect-min-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

2 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

3 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

queue random-detect-max-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

2 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

3 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

WRED disabled queues: 1 2 3

queue thresh cos-map

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

1 1 0 1 2 3 4 5 6 7

1 2

1 3

1 4

1 5

1 6

1 7

1 8

2 1

2 2

2 3

2 4

2 5

2 6

2 7

2 8

3 1

3 2

3 3

3 4

3 5

3 6

3 7

3 8

4 1

Queueing Mode In Rx direction: mode-cos

Receive queues [type = 1q8t]:

Queue Id Scheduling Num of thresholds

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

01 WRR 08

WRR bandwidth ratios: 100[queue 1]

queue-limit ratios: 100[queue 1]

queue tail-drop-thresholds

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

1 100[1] 100[2] 100[3] 100[4] 100[5] 100[6] 100[7] 100[8]

queue thresh cos-map

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

1 1 0 1 2 3 4 5 6 7

1 2

1 3

1 4

1 5

1 6

1 7

1 8

Packets dropped on Transmit:

queue dropped [cos-map]

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

1 0 [0 1 2 3 4 5 6 7 ]

2 0 []

3 0 []

4 0 []

Packets dropped on Receive:

queue dropped [cos-map]

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

1 0 [0 1 2 3 4 5 6 7 ]

KB-SR1-6509-1#

Alexander Maroukian · ‎03-11-2013

Hello Zeeshan,

The numbers you are looking are different one is the output the other is input queue.

You have highlighted it transmit queue in QoS output and input queue on interface.

So both seems right.

You may find more information about the queue in the following link:

http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a008015bf98.shtml#queue_drops

The following document is about input and output queue on the interfaces:

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

HTH,

Alex

*Please rate helpful posts

Zeeshan Siddiqui · ‎03-11-2013

Hi Alexander,

Many Thanks for the update

Pls find Below output from Queuing command

sh queuing interface Gi1/6 (pls find relevant info below from the command)

Packets dropped on Transmit:

queue dropped [cos-map]

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

1 999434248 [0 1 2 3 4 5 6 7 ]

2 0 []

3 0 []

4 0 []

Below is output from sh int Gi1/6 (pls find relevant info below from command)

Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 0

Queueing strategy: fifo

Output queue: 0/40 (size/max)

Pls find my question below

When we see packet drop on queue 1 999434248 (packets droped on transmit) shouldnt we see the total output drops go up with the sh int command. (both input drops and output drops are zero with the Sh interface command)

We are looking forward for an network upgrade and I am trying to do an audit and am bit confused here (trying to identify bottle necks so we can purchase the right cards etc) accroding to the sh int command there is no congestion / drops according to the Queuing command they are drops. (WE have QOS disabled so all traffc is in queue 1)

Kind Regards,

Zee

Alexander Maroukian · ‎03-12-2013

Hello Zee,

Maybe the easiest approach will be opening a case with TAC because configuration should be checked, the version of the software also, some capture or debugs maybe needed.

Just to ask you one more thing are these counters increasing?

Best regards,

Alex

InayathUlla Sharieff · ‎03-12-2013

HI Zeeshan,

Is this input drops getting increase very min or during any specific point of time? Is there any way to configure the SPAN on this port to see what burst of traffic is hitting this interface? You can once clear the counters on this interface and monitor the situation and see what specific time the drops gets increased?

Regards

Inayath

Zeeshan Siddiqui · ‎03-14-2013

Hi Alexander / Sharieff,

Many thanks for your reply much appreciated

I have checked the stats and the drops using the sh queuing int Gi1/6 and have not gone up I will keep an eye if they go up will run a span sessionss and log a call with TAC

MAny Thanks for your help

Zee