Packet drops in HQF class !

KAROLY KOHEGYI · ‎01-24-2012

Hello!

The following part of policy-map shows there are dropped packet in class ( WAN_DSCP_CS1 drop rate 3000 bps )

The actually rate is lowest as target shape rate and the no-buffer drops counter is zero!

The full config contains appr. 100 branch-class and every branch-class call the WAN_OUTPUT_V.1 policy.

We applied the service-policy on GigabitEthernet 0/3.

The hardware is 7206VXR-G1 the softver is 12.4.20.T advanced ip services

How it is possible to find it how the router throws away the packets why?

Class-map: debrecen (match-any)

6100639 packets, 2386603748 bytes

30 second offered rate 1179000 bps, drop rate 3000 bps

Match: access-group name debrecen

6100639 packets, 2386603748 bytes

30 second rate 1179000 bps

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 0/26308/0

(pkts output/bytes output) 3024421/1270775183

shape (average) cir 1900000, bc 7600, be 7600

target shape rate 1900000

Service-policy : WAN-OUTPUT-V.1

queue stats for all priority classes:

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 0/0/0

(pkts output/bytes output) 661602/88789612

Class-map: WAN_DSCP_EF (match-all)

1323206 packets, 143171814 bytes

30 second offered rate 2000 bps, drop rate 0 bps

Match: ip dscp ef (46)

Priority: 17% (323 kbps), burst bytes 8050, b/w exceed drops: 0

QoS Set

cos 5

Packets marked 661602

Class-map: WAN_DSCP_CS3 (match-any)

16294 packets, 8056869 bytes

30 second offered rate 0 bps, drop rate 0 bps

Match: ip dscp cs3 (24)

0 packets, 0 bytes

30 second rate 0 bps

Match: ip dscp af41 (34)

0 packets, 0 bytes

30 second rate 0 bps

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 0/0/0

(pkts output/bytes output) 8147/4249838

bandwidth 3% (57 kbps)

Class-map: WAN_DSCP_CS1 (match-any)

1244538 packets, 279892316 bytes

30 second offered rate 109000 bps, drop rate 3000 bps

Match: ip dscp cs1 (8)

0 packets, 0 bytes

30 second rate 0 bps

Match: protocol eigrp

0 packets, 0 bytes

30 second rate 0 bps

Queueing

queue limit 128 packets

(queue depth/total drops/no-buffer drops) 0/26308/0

(pkts output/bytes output) 596188/153156045

bandwidth 40% (760 kbps)

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

GigabitEthernet0/3 is up, line protocol is up

Hardware is MV64460 Internal MAC, address is 0019.56b2.c419 (bia 0019.56b2.c419)

Description: INTERLINK Multiflex

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

reliability 255/255, txload 2/255, rxload 1/255

Encapsulation 802.1Q Virtual LAN, Vlan ID 1., loopback not set

Keepalive set (10 sec)

Full-duplex, 1000Mb/s, media type is RJ45

output flow-control is XON, input flow-control is XON

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

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

Last clearing of "show interface" counters 19:18:51

Input queue: 0/300/669/0 (size/max/drops/flushes); Total output drops: 275049

Queueing strategy: Class-based queueing

Output queue: 102/1500/0 (size/max total/drops)

30 second input rate 5518000 bits/sec, 3183 packets/sec

30 second output rate 9701000 bits/sec, 3662 packets/sec

120693102 packets input, 4292419309 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

1 input errors, 0 CRC, 0 frame, 0 overrun, 1 ignored

0 watchdog, 19340047 multicast, 0 pause input

0 input packets with dribble condition detected

128241462 packets output, 4017681995 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

KAROLY KOHEGYI · ‎01-24-2012

Sorry the hardver is 7206VXR-G2 !!

Joseph W. Doherty · ‎01-24-2012

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Posting

Might be insufficient queue space for bursts.

KAROLY KOHEGYI · ‎01-25-2012

The no-buffer drops is zero!

How can i check the queue space?

Joseph W. Doherty · ‎01-25-2012

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

KAROLY KOHEGYI wrote:

The no-buffer drops is zero!

How can i check the queue space?

If I remember correctly, no-buffer drops being zero just means you did not run out of physical buffer space. The drops you're seeing, I believe, are you're just hitting your logical queue depths. The queue limits are what might be increased.

KAROLY KOHEGYI · ‎01-25-2012

The queue-depth is zero also!

it is confuse!

Joseph W. Doherty · ‎01-25-2012

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

KAROLY KOHEGYI wrote:

The queue-depth is zero also!

it is confuse!

Queue-depth is number of packets in queue at time of snapshot - not uncommon to get drops and not "catch" packets in queue in cases of transient bursts.

KAROLY KOHEGYI · ‎01-25-2012

Hi,

Here is the newest confuse issue!

The offered rate is higher than shap rate and no drops ! (close to shape peak !!! )

sho policy-map interface output class pecs

GigabitEthernet0/1

GigabitEthernet0/3

Service-policy output: MF

Class-map: pecs (match-any)

46762967 packets, 21107524803 bytes

30 second offered rate 3665000 bps, drop rate 0 bps

Match: access-group name pecs

46762968 packets, 21107524681 bytes

30 second rate 3665000 bps

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 166/155121/0

(pkts output/bytes output) 23505715/11060330966

shape (average) cir 1900000, bc 7600, be 7600

target shape rate 1900000

Service-policy : WAN-OUTPUT-V.1

queue stats for all priority classes:

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 0/0/0

(pkts output/bytes output) 3019213/402263119

Class-map: WAN_DSCP_EF (match-all)

6027535 packets, 646795939 bytes

30 second offered rate 43000 bps, drop rate 0 bps

Match: ip dscp ef (46)

Priority: 17% (323 kbps), burst bytes 8050, b/w exceed drops: 0

QoS Set

cos 5

Packets marked 3019213

Class-map: WAN_DSCP_CS3 (match-any)

81716 packets, 73702102 bytes

30 second offered rate 4000 bps, drop rate 0 bps

Match: ip dscp cs3 (24)

0 packets, 0 bytes

30 second rate 0 bps

Match: ip dscp af41 (34)

0 packets, 0 bytes

30 second rate 0 bps

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 0/83/0

(pkts output/bytes output) 40779/37813432

bandwidth 3% (57 kbps)

Class-map: WAN_DSCP_CS1 (match-any)

2480434 packets, 382699335 bytes

30 second offered rate 2000 bps, drop rate 0 bps

Match: ip dscp cs1 (8)

0 packets, 0 bytes

30 second rate 0 bps

Match: protocol eigrp

0 packets, 0 bytes

30 second rate 0 bps

Queueing

queue limit 128 packets

(queue depth/total drops/no-buffer drops) 0/33688/0

(pkts output/bytes output) 1345706/227547725

bandwidth 40% (760 kbps)

Class-map: WAN_DSCP_CS2 (match-all)

512708 packets, 73151425 bytes

30 second offered rate 2000 bps, drop rate 0 bps

Match: ip dscp cs2 (16)

Queueing

queue limit 128 packets

(queue depth/total drops/no-buffer drops) 0/0/0

(pkts output/bytes output) 256354/43483468

bandwidth 15% (285 kbps)

Class-map: WAN_DSCP_AF11 (match-all)

20029430 packets, 2618963100 bytes

30 second offered rate 166000 bps, drop rate 0 bps

Match: ip dscp af11 (10)

Queueing

queue limit 64 packets

(queue depth/total drops/no-buffer drops) 0/1929/0

(pkts output/bytes output) 10117875/1580628559

bandwidth 5% (95 kbps)

Class-map: class-default (match-any)

17631141 packets, 17312212798 bytes

30 second offered rate 3448000 bps, drop rate 0 bps

Match: any

Queueing

queue limit 256 packets

(queue depth/total drops/no-buffer drops) 165/119421/0

(pkts output/bytes output) 8725788/8768594663

bandwidth 20% (380 kbps)

mmihalyf · ‎01-24-2012

Can you please try increasing the BC and BE values after your shape command?

Joseph W. Doherty · ‎01-24-2012

Disclaimer

The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.

Liability Disclaimer

In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.

Posting

An interesting suggestion. Newer IOS seem to default to a 4 ms Tc rather than 25 ms Tc. What you thinking for Tc, maybe 10 ms (19,000 Bc)?